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1.
Four copper(II) complexes [Cu2(1,3-tpbd)Cl4]·EtOH (1), {[Cu2(1,3-tpbd)(μ-Cl)2](ClO4)2(H2O)4.5 (NaClO4)}∞ (2), [Cu2(1,3-tpbd)(1,10-phen)2(H2O)2](ClO4)4 (3) and [Cu2(1,3-tpbd)(2,2′-bpy)2(H2O)2](ClO4)4 (4) (1,3-tpbd = N,N,N′,N′-tetrakis(2-pyridylmethyl)benzene-1,3-diamine) have been synthesized and characterized by X-ray single crystal structure analysis. Variable-temperature magnetic susceptibility studies (2-300 K) indicate the existence of antiferromagnetic coupling between the copper(II) ions in complexes 2 and 3. The interactions of the four complexes with calf thymus DNA (CT-DNA) have been investigated by UV absorption, fluorescent spectroscopy, circular dichroism spectroscopy, viscosity and cyclic voltammetry, and the modes of CT-DNA binding to the complexes have been proposed. Furthermore, DNA cleavage activities by the four complexes were performed in the presence and absence of external agents, the results indicate that their cleavage activities have been promoted in the presence of external agents. Mechanism investigation shows that the four complexes could cleave DNA through both oxidative and hydrolytic processes. In the four copper(II) complexes, complex 2 showed highest cleavage activity with the pseudo-Michaelis-Menten kinetic paraments kcat = 5.16 h−1 and Km = 3.6 × 10−5 M. 相似文献
2.
Three new binuclear copper(II) complexes have been synthesized and structurally characterized by X-ray crystallography, [Cu2(1,4-tpbd)(dafo)2(MeOH)2](ClO4)4·2.5H2O (1), [Cu2(1,4-tpbd) (DMSO)2(ClO4)2](OH)2·6H2O (2) and [Cu2(1,4-tpbd)(OAC)2(ClO4)2]·5H2O (3) (1,4-tpbd = N,N,N′,N′-tetrakis(2-pyridylmethyl)benzene-1,4-diamine). Complex 1 to 3 shows similar binuclear structure and each Cu atom adopts five-coordinated square-pyramidal geometry. The interactions of the three complexes with CT-DNA (Calf-thymus DNA) have been investigated by UV absorption, fluorescence spectroscopy, circular dichroism spectroscopy and viscosity. Furthermore, the three complexes display oxidative cleavage of supercoiled DNA in the presence of external agents. Complex 3 shows higher DNA affinity and nuclease activity may be attributed to its cis structural configuration and labile acetate and perchlorate anions. The cleavage mechanisms between the complexes and plasmid DNA are likely to involve singlet oxygen or singlet oxygen-like entity as reactive oxygen species. In addition, in vitro cytotoxicity studies on the Hela cell line show that the IC50 values of complexes 1-3 are 14.75, 13.67 and 16.58 μM, respectively. The apoptosis-inducing activity was also assessed by AO/EB (Acridine Orange/Ethidium bromide) staining assay, indicating they have the potential to act as effective metal-based anticancer drugs. 相似文献
3.
Lei Jia Peng Jiang Zhong-yan Hao Long-hai Chen Ning Tang Qin Wang 《Inorganica chimica acta》2010,363(5):855-6176
Three novel ternary copper(II) complexes, [Cu2(phen)2(l-PDIAla)(H2O)2](ClO4)2·2.5H2O (1), [Cu4(phen)6(d,l-PDIAla)(H2O)2](ClO4)6·3H2O (2) and [Cu2(phen)2(d,l-PDIAla)(H2O)](ClO4)2·0.5H2O (3) (phen = 1,10-phenanthroline, H2PDIAla = N,N’-(p-xylylene)di-alanine acid) have been synthesized and structurally characterized by single-crystal X-ray crystallography and other structural analysis. Spectrometric titrations, ethidium bromide displacement experiments, CD (circular dichroism) spectral analysis and viscosity measurements indicate that the three compounds, especially the complex 3, strongly bind to calf-thymus DNA (CT-DNA). The intrinsic binding constants of the ternary copper(II) complexes with CT-DNA are 0.89 × 105, 1.14 × 105 and 1.72 × 105 M−1, for 1, 2 and 3, respectively. Comparative cytotoxic activities of the copper(II) complexes are also determined by acid phosphatase assay. The results show that the ternary copper(II) complexes have significant cytotoxic activity against the HeLa (Cervical cancer), HepG2 (hepatocarcinoma), HL-60 cells (myeloid leukemia), A-549 cells (pulmonary carcinoma) and L02 (liver cells). Investigations of antioxidation properties show that all the copper(II) complexes have strong scavenging effects for hydroxyl radicals and superoxide radicals. 相似文献
4.
The synthesis and crystal structure of four new copper(I) and copper(II) supramolecular amine, and amine phosphonate, complexes is reported. Reaction of copper(I) with 2-,9-dimethyl-1-10-phenanthroline (dmp) produced a stable 4-coordinate Cu(I) species, [Cu(I)(dmp)2]Cl · MeOH · 5H2O (2), i.e., the increased steric hindrance in the ‘bite’ area of dmp did not prevent interaction with the metal and provided protection against oxidation which was not possible for the phen analogue [R. Clarke, K. Latham, C. Rix, M. Hobday, J. White, CrystEngCommun. 7(3) (2005), 28-36]. Subsequent addition of phenylphosphonic acid to (2) produced two structures from alternative synthetic routes. An ‘in situ’ process yielded red block Cu(I) crystals, [Cu(I)(dmp)2] · [C6H5PO3H2 · C6H5PO3H] (4), whilst recrystallisation of (2) prior to addition of the acid (‘stepwise’ process) produced a green, needle-like Cu(II) complex, [Cu(II)(dmp) · (H2O)2 · C6H5PO2(OH)] [C6H5PO2(OH)] (3). However, addition of excess dmp during the ‘stepwise’ process forced the equilibrium towards product (4) and resulted in an optimum yield (99%). The structure of (4) was similar to the phen analogue, [Cu(II)Cl(phen)2] · [C6H5PO2(OH) · C6H5PO(OH)2] (1) [R. Clarke, K. Latham, C. Rix, M. Hobday, J. White, CrystEngCommun. 7(3) (2005), 28-36], but the presence of dmp exerted some influence on global packing, whilst (3) exists as a polymeric layered material. In contrast, reaction of copper(I) with di-2-pyridyl ketone (dpk), followed by phenylphosphonic acid produced purple/blue Cu(II) species, [Cu(II)(dpk · H2O)2] Cl2 · 4H2O (5), and [Cu(II)(dpk · H2O)2] · [C6H5PO2(OH)2 · C6H5PO(OH)2] (6), respectively, i.e., in both cases oxidation of copper occurred. Solid-state luminescence was observed in (2) and (4). The latter showing a 5-fold enhancement in intensity. 相似文献
5.
Four copper(II) complexes containing the reduced Schiff base ligands, namely, N-(2-hydroxybenzyl)-glycinamide (Hsglym) and N-(2-hydroxybenzyl)-l-alaninamide (Hsalam) have been synthesized and characterized. The crystal structures of [Cu2(sglym)2Cl2] (1), [Cu2(salam)2(NO3)2] · H2O (3), [Cu2(salam)2(NO3)(H2O)](NO3) · 1.5H2O (4), [Cu2(salam)2](ClO4)2 · 2H2O (5) show that the Cu(II) atoms are bridged by two phenolato oxygen atoms in the dimers. The sglym ligand bonded to Cu(II) in facial manner while salam ligand prefers to bind to Cu(II) in meridonal geometry. Variable temperature magnetic studies of 3 showed it is antiferromagnetic. These Cu(II) complexes and [Cu2(sglym)2(NO3)2] (2), exhibit very small catecholase activity as compared to the corresponding complexes containing acid functional groups. 相似文献
6.
The heterotrimetallic complex, [{LCuMn(H2O)}{Cr(phen)(C2O4)2}](ClO4) · H2O (1), has been obtained by assembling heterobinuclear cations, [LCuMn]2+, with [Cr(phen)(C2O4)2]− ions (H2L is the compartmental Schiff-base resulting from the stepwise condensation of 2,6-diformyl-p-cresol with ethylenediamine and diethylenetriamine). The copper(II) and manganese(II) ions are hosted into the compartments of the macrocyclic ligand. [Cr(phen)(C2O4)2]− acts as a ligand, being coordinated through one oxalato oxygen atom to the apical position of the square pyramidal copper(II) ion. The cryomagnetic investigation of 1 reveals an antiferromagnetic interaction between CuII and MnII within the compartmental ligand (J = −39 cm−1). The interaction between CuII and CrIII across the oxalato bridge is negligible. The crystal structure of [LCuPb](ClO4)2 · H2O, a useful precursor in obtaining 3d-3d′ complexes, is also reported. 相似文献
7.
Two new one-dimensional copper(II) polymers with formulae of [Cu2(H2O)2(dmapox)(ipa)2]n (1) and [Cu2(H2O)2(dmapox)(tpa)2]n (2), where dmapox, ipa and tpa stand for the dianion of N,N′-bis[3-(dimethylamino)propyl]oxamide, isophthalic acid and terephthalic acid respectively, have been synthesized and characterized by elemental analysis, conductivity measurement, IR and electronic spectral studies. The crystal structures of the two complexes have been determined by X-ray single-crystal diffraction. The structures of 1 and 2 consist of one-dimensional copper(II) coordination polymeric chain constructed both by the bis-tridentate trans-dmapox and bis-monodentate phenyldicarboxylate bridging ligands. In the two complexes, the environment around the copper(II) atoms can be described as distorted square-pyramid and the Cu···Cu separations through μ-trans-dmapox and phenyldicarboxylato bridging ligands are 5.245(5) Å and 8.212(3) Å for 1, 5.237(8) Å and 11.171(1) Å for 2, respectively. The binding properties of the two copper(II) polymers with herring sperm DNA (HS-DNA) have been investigated by using absorption and emission spectral and electrochemical techniques and viscometry. The results show that the two copper(II) complexes interact with the HS-DNA in the mode of intercalation with the intrinsic binding constants of 1.22(±0.2) × 104 M−1 and 1.45(±0.3) × 104 M−1 for 1 and 2, respectively. 相似文献
8.
Lukasz Ponikiewski 《Inorganica chimica acta》2005,358(4):1322-1326
The insertion reaction of maleic anhydride into the Cu-O bond in [CuOtBu] produced the complexes [Cu2(CO2C2H2CO2tBu)4 · dme] (1), [Cu(CO2C2H2CO2tBu)2 · tmeda] (2) and [Cu2(CO2C2H2CO2tBu)2 · dppm]2 (3) (dme = 1,2-dimethoxyethane; tmeda = N1,N1,N2,N2-tetramethylethane-1,2-diamine; dppm = bis(diphenylphosphino)methane). This reaction represents a useful synthetic strategy for a range of functionalised Cu(I) and Cu(II) carboxylates. 相似文献
9.
Arpita Jana Malabika Nayak Supriya Dutta Sasankasekhar Mohanta 《Inorganica chimica acta》2011,365(1):71-214
Reaction of [CuIIL⊂(H2O)] (H2L = N,N′-ethylenebis(3-ethoxysalicylaldimine)) with nickel(II) perchlorate in 1:1 ratio in acetone produces the trinuclear compound [(CuIIL)2NiII(H2O)2](ClO4)2 (1). On the other hand, on changing the solvent from acetone to methanol, reaction of the same reactants in same ratio produces the pentametallic compound [(CuIIL)2NiII(H2O)2](ClO4)2·2[CuIIL⊂(H2O)]·2MeOH (2A), which loses solvated methanol molecules immediately after its isolation to form [(CuIIL)2NiII(H2O)2](ClO4)2·2[CuIIL⊂(H2O)] (2B). Clearly, formation of 1 versus 2A and 2B is solvent dependent. Crystal structures of 1 and 2A have been determined. Interestingly, compound 2A is a [3 × 1 + 1 × 2] cocrystal. The cryomagnetic profiles of 1 and 2B indicate that the two pairs of copper(II)···nickel(II) ions in the trinuclear cores in both the complexes are coupled by almost identical moderate antiferromagnetic interaction (J = −22.8 cm−1 for 1 and −26.0 cm−1 for 2B). 相似文献
10.
Preparation, crystal structures and magnetic properties of new heterodinuclear CuIIGdIII (1) and CuIITbIII (2) complexes [CuLn(L)(NO3)2(H2O)3MeOH]NO3·MeOH (where Ln = Gd, Tb) with the hexadentate Schiff-base compartmental ligand N,N′-bis(5-bromo-3-methoxysalicylidene)propylene-1,3-diamine (H2L = C19H20N2O4Br2) (0) have been described. Crystal structure analysis of 1 and 2 revealed that they are isostructural and form discrete dinuclear units with dihedral angle between the O1Cu1O2 and O1Gd1/Tb1O2 planes equal to 2.5(1)° and 2.6(1)°, respectively. The variable-temperature and variable-field magnetic measurements indicate that the metal centers in 1 and 2 are ferromagnetically coupled (J = 7.89 cm−1 for 1). Crystal and molecular structure of the Schiff base ligand (0) has been also reported. The complex formation changes the conformation of Schiff base ligand molecule. 相似文献
11.
Reactions of H2L [H2L = N,N′-bis(3-methoxysalicylidene)propane-1,2-diamine] and Ln(NO3)3 · 6H2O give rise to two different mononuclear 4f complexes, namely, {[(H2L)La(NO3)3(MeOH)] · H2O}n (1) and [(H2L)Nd(NO3)3] (2). Further additions of Cu(Ac)2 · H2O to the mononuclear 4f complexes yield expected heterodinuclear Cu-4f complexes [LCu(Me2CO)Ln(NO3)3] (3, Ln = Nd; 4, Ln = Eu; 5, Ln = Dy). Complex 1 is a unique 1D polymeric chain structure, and 2 is one of the few structurally characterized discrete hexadentate salen-type mononuclear 4f complexes. Complexes 3-5 are similar to their analogues. However, they are prepared by a reversed synthetic route in contrast to their isomorphic complexes. Electrochemical behavior of heterodinuclear Cu-4f complexes 3-5 has been examined by cyclic voltammetry in acetonitrile. The redox potential of heterodinuclear Cu-4f complexes 3-5 shows significant anodic shift comparing to that of mononuclear copper complex (LCu). A tendency of anodic shift was observed in a sequence of 3 < 4 < 5. This results from the modulating effect of coordination geometry around Cu(II) ion on redox potential. 相似文献
12.
Petra Bombicz Ilpo Mutikainen Tuula Leskelä Lauri Niinistö 《Inorganica chimica acta》2004,357(2):513-525
Complex formation of thiourea with copper takes place as an intermediate step in the preparation of copper sulfide thin films by spray pyrolysis starting from aqueous solutions of copper(II) chloride and thiourea. The stoichiometry of the complex and that of the resulting thin film primarily depends on the molecular ratio of the starting materials. For comparison, the structures of all copper(I) thiourea complexes found in the Cambridge Structural Database are classified in this paper. In addition, syntheses, structural (single crystal XRD also at low temperature 193 K) and spectroscopic studies (FTIR and Raman) of six copper-thiourea complexes are now reported. The copper to thiourea stoichiometric ratio is 1:3 in four of these complexes, but their structures are basically different as dimerization or polymer formation takes place depending on whether the water of crystallisation is present or absent. The structure of bis(μ-thiourea)tetrakis(thiourea)dicopper(I) dichloride dihydrate, [Cu2(tu)6]Cl2 · 2H2O (1) was determined at room and also at low temperature. Bis(μ-thiourea)tetrakis(thiourea)dicopper(I) dibromide dihydrate, [Cu2(tu)6]Br2 · 2H2O (2) is isomorphous with 1, like the anhydrous compounds chlorotris(thiourea)copper(I), [Cu(tu)3]Cl (3) and bromotris(thiourea)copper(I), [Cu(tu)3]Br (4) are isomorphous. In the third isomorphous pair of complexes the copper to thiourea stoichiometric ratio is 1:1, viz. chloro(thiourea)copper(I) hemihydrate, [Cu(tu)]Cl · 0.5H2O (5) and bromo(thiourea)copper(I) hemihydrate, [Cu(tu)]Br · 0.5H2O (6). During the preparation of chloro(thiourea)copper(I) hemihydrate (5) a reaction by product α,α′-dithiobisformamidinium dichloride, [SC(NH2)2]2Cl2 (7) was identified and structurally characterized which made it possible to suggest a reaction path leading to complex formation. 相似文献
13.
Two new μ-oxamido-bridged binuclear copper(II) complexes with formulae of [Cu2(heae)(pic)2] (1) and [Cu2(heae)(Me2phen)2](ClO4)2 · H2O (2), where heae and pic stand for the anion of N,N′-bis(N-hydroxyethylaminoethyl)oxamide and 2,4,6-trinitrophenol, respectively, and Me2phen represents 2,9-dimethyl-1,10-phenanthroline; have been synthesized and characterized by elemental analyses, molar conductivity measurements, IR and electronic spectra studies. The crystal structures of the two binuclear copper(II) complexes have been determined by X-ray single-crystal diffraction. In both the two binuclear complexes the central two copper(II) atoms are bridged by trans-heae. In complex 1 the coordination environment around each copper(II) atom can be described as a distorted octahedral geometry, while in complex 2 each copper(II) atom displays a square-pyramid stereochemistry. Hydrogen bonding and π-π stacking interactions link the binuclear copper(II) complex 1 or 2 into a 3D infinite network. The cytotoxicities of the two binuclear copper(II) complexes were tested by Sulforhodamine B (SRB) assays against human hepatocellular carcinoma cell SMMC-7721 and human lung adenocarcinoma cell A549. Both of the two binuclear copper(II) complexes exhibit potent cytotoxic effects against SMMC-7721 and A549 cell lines. The interactions of the two binuclear complexes with herring sperm DNA (HS-DNA) are investigated by using absorption and emission spectra and electrochemical techniques and viscometry. The results suggest that both the two binuclear copper(II) complexes interact with HS-DNA in the mode of intercalation with the intrinsic binding constants of 1.73 × 105 M−1 (1) and 1.92 × 106 M−1 (2). The influence of structural variation of the terminal ligands in the binuclear complexes on DNA-binding properties is preliminarily discussed. 相似文献
14.
Two copper(II) tricyanomethanide (tcm) complexes with 2,2′-bipyrimidine (bpym) as co-ligands Cu4(bpym)5(tcm)8 · 2H2O (1) and [Cu2(bpym)2(tcm)4 · H2O]n (2) have been synthesized, and structurally and magnetically characterized. Compound 1 displays a tetranuclear structure, in which each middle copper(II) atom is coordinated by two bridging bpym molecules and two terminal tcm ligands to form a tetragonal bipyramidal geometry, while each side copper(II) atom is surrounded by one bridging bpym, one terminal bpym, one terminal bonded tcm and one terminal weakly coordinated tcm ligands to give a square bipyramidal geometry. In 1 the four neighbouring copper(II) atoms are joined to each other by the bpym molecules, which leads to the formation of a tetranuclear structure. Compound 2 features an infinite chain structure, in which two slightly different chains exist. In each chain the copper(II) atom is bonded to two bridging bpym molecules and two terminal tcm ligands to form a tetragonal bipyramidal geometry, the adjacent copper(II) atoms are linked each other by the bpym ligands to define an infinite chain structure. In 2 the distances between two neighbouring copper(II) atoms in one chain are different. Moreover these distances in one chain are also different from those of the other chain. Magnetic susceptibility measurements for the two complexes in the temperature range 2-300 K reveal the occurrence of significant antiferromagnetic interactions for 1 (J1 = −20.42 cm−1, J2 = −5.29 cm−1 and g = 2.22) and 2 (T > 50 K, θ = −20.00 K, C = 0.86 cm3 mol−1 K), respectively. 相似文献
15.
To compare the cytotoxicities and the DNA-binding properties in tetranuclear complexes with different bridging ligands, two tetracopper(II) complexes with formulae of [Cu4(oxbe)2Cl2(bpy)2]·4H2O (1) and [Cu4(oxbm)2Cl2(bpy)2]·2H2O (2) were synthesized, where H3oxbe and H3oxbm stand for N-benzoato-N′-(2-aminoethyl)oxamide and N-benzoato-N′-(1,2-propanediamine)oxamide, respectively, and bpy is 2,2′-bipyridine. Complex 1 was characterized by elemental analyses, IR and electronic spectra and single-crystal X-ray diffraction. The crystal structure reveals the presence of the circular tetranuclear copper(II) cations which are assembled by a pair of cis-oxamido-bridged dinuclear copper(II) units through carboxyl bridges. The crystal structure of complex 2 has been reported in our previous paper. However, the bioactivities were not studied. Cytotoxicities experiments reveal that both the two complexes exhibit cytotoxic effects against human hepatocellular carcinoma cell SMMC-7721 and human lung adenocarcinoma cell A549, and complex 1 has the better activities than those of complex 2. The results of the interactions between the two complexes and herring sperm DNA (HS-DNA) suggest that the two complexes interact with HS-DNA in the mode of intercalation with the intrinsic binding constants of 3.93 × 104 M−1 (1) and 2.48 × 104 M−1 (2). These results indicated that the bridging ligands may play an important role in the cytotoxicities and the DNA-binding properties of tetranuclear complexes. 相似文献
16.
The complexes [Cu2(o-NO2-C6H4COO)4(PNO)2] (1), [Cu2(C6H5COO)4(2,2′-BPNO)]n (2), [Cu2(C6H5COO)4(4,4′-BPNO)]n (3), [Cu(p-OH-C6H4COO)2(4,4′-BPNO)2·H2O]n (4), (where PNO = pyridine N-oxide, 2,2′-BPNO = 2,2′-bipyridyl-N,N′-dioxide, 4,4′-BPNO = 4,4′-bipyridyl-N,N′-dioxide) are prepared and characterized and their magnetic properties are studied as a function of temperature. Complex 1 is a discrete dinuclear complex while complexes 2-4 are polymeric of which 2 and 3 have paddle wheel repeating units. Magnetic susceptibility measurements from polycrystalline samples of 1-4 revealed strong antiferromagnetic interactions within the {Cu2}4+ paddle wheel units and no discernible interactions between the units. The complex 5, [Cu(NicoNO)2·2H2O]n·4nH2O, in which the bridging ligand to the adjacent copper(II) ions is nicotinate N-oxide (NicoNO) the transmitted interaction is very weakly antiferromagnetic. 相似文献
17.
Christiane Fernandes Adolfo Horn Jr. Vagner M. de Assis Luciana da S. Mathias Adailton J. Bortoluzzi João Carlos Aquino Almeida 《Journal of inorganic biochemistry》2010,104(11):1214-1223
We synthesized iron(III), cobalt(II), copper(II) and zinc(II) complexes [FeIII(HBPClNOL)Cl2]·H2O (1), [CoII(H2BPClNOL)Cl2] (2), [CuII(H2BPClNOL)Cl]Cl·H2O (3), and [ZnII(HBPClNOL)Cl] (4), where H2BPClNOL is the ligand (N-(2-hydroxybenzyl)-N-(2-pyridylmethyl)[(3-chloro)(2-hydroxy)]propylamine). The complexes obtained were characterized by elemental analysis, IR and UV-visible spectroscopies, electrospray ionization mass spectrometry (ESI-MS), tandem mass spectrometry (MS/MS), and cyclic voltammetry. X-ray diffraction studies were performed for complexes (3) and (4) revealing the presence of mononuclear and dinuclear structures in solid state for (3). However, the zinc complex is mononuclear in solid state. Biological studies of complexes (1)-(4) were carried out in vitro for antimicrobial activity against nine Gram-positive bacteria (Staphylococcus aureus strains RN 6390B, COL, ATCC 25923, Smith Diffuse, Wood 46, enterotoxigenic S. aureus FRI-100 (SEA+), FRI S-6 (SEB+) and SEC FRI-361) and animal strain S. aureus LSA 88 (SEC/SED/TSST-1+). The following sequence of inhibition promoted by the complexes was observed: (4) > (2) > (3) > (1), showing the effect of the metal on the biological activity. To directly observe the morphological changes of the internal structure of bacterial cells after the treatment, transmission electron microscopy (TEM) was employed. For the most active complex [ZnII(HBPClNOL)Cl] (4), granulation deposits around the genetic material and internal material leaking were clearly detected. 相似文献
18.
The dinuclear and trinuclear copper(II) complexes [Cu2(L)(OH)(ClO4)(phen)(H2O)]ClO4 · [Cu2(L)(OH)(ClO4)2(phen)(CH3OH)] (1) and [Cu3(L)2(OH)2(H2O)2](NO3)2 (2) (HL=2-[2-(α-pyridyl)ethyl]imino-3-butanone oxime and phen=1,10-phenanthroline) were prepared and their crystal structures have been determined by X-ray crystallography. Complex 1 is composed of [Cu2(L)(OH)(ClO4)(phen)(H2O)]ClO4 (1a) and [Cu2(L)(OH)(ClO4)2(phen)(CH3OH)] (1b). In 1a and 1b, one oximato of L and one hydroxo group bridge two copper(II) ions. The linear trinuclear cation [Cu3(L)2(OH)2(H2O)2]2+ in 2 is centrosymmetric, and one oximato and one hydroxo group bridge the central and terminal copper(II) ions. The strong antiferromagnetic interactions within the dinuclear and trinuclear complexes 1 and 2 have been observed (2J=∼−900 cm−1 for 1 and 2, respectively, H=−2JS1·S2). 相似文献
19.
Three one-dimensional zinc complexes, namely, [Zn(pzdc) · 3H2O] · H2O (1), [Zn2(pzdc)2 · 4H2O] · 2.5H2O (2), and [Zn(pzdc)(phen) · 4H2O]n (3) (H2pzdc, pyrazine-2,3-dicarboxylic acid, phen = 1,10-phenanthroline), have been synthesized successfully under hydrothermal condition. X-ray diffraction analyses reveal that complex 1 is a square-wave-like chain and complex 2 shows a 1D ladder-like infinite chain, while complex 3 has 1D zigzag chain structure. In all cases, the Zn(II) centers have octahedral coordination geometries. Through hydrogen bonding (such as O-H···O, O-H···N and C-H···O) and/or π-π stacking interactions, three-dimensional supramolecular networks are constructed in three complexes. Furthermore, the IR, TGA and luminescent properties are also investigated in this work. 相似文献
20.
Akhilesh Kumar Singh 《Inorganica chimica acta》2007,360(10):3456-3461
A new distorted square planar (two CuN2 planes making an angle of ∼43°) copper(II) complex [Cu(L4)] · 0.5EtOH · 0.5MeOH (1) of a deprotonated tetradentate pyridine amide ligand [H2L4 = N,N′-bis(2-pyridinecarboxamide)-2,2′-biphenyl] has been synthesized and structurally characterized. Absorption and EPR spectroscopic properties have also been studied. The E1/2 values (CuII/CuI redox process) of the title complex along with a selected group of structurally characterized CuN4 pyridine amide complexes with systematically varied structural, electronic/steric, and chelate-ring size effects, imposed by the coordinating ligands, have been determined and the observed trend has been rationalized. 相似文献