共查询到20条相似文献,搜索用时 9 毫秒
1.
Xiao-Yan Han 《Inorganica chimica acta》2010,363(2):353-1619
Two adamantane-1,3-dicarboxylato bridged cobalt(II) phenanthroline complexes [Co2(H2O)2(phen)2(adc)2]·(C2H7N)·2H2O (1) and [Co(H2O)(phen)(adc)]·H2O (2) were synthesized in a mixed solvent under 45 °C (H2adc = adamantane-1,3-dicarboxylic acid). Compound 1 consists of dinuclear [Co2(H2O)2(phen)2(adc)2] complex molecules, dimethylamine (C2H7N) molecules and hydrogen-bonded water molecules. The dinuclear molecules, via intermolecular hydrogen bonds, are interconnected into hydrogen-bonded chains along [1 0 0] and interdigitation of phen ligands due to interchain π?π stacking interactions assembles the hydrogen-bonded chains into 2D supramolecular layers parallel to (0 0 1). In compound 2, the Co(II) ions are bridged by adamantane-1,3-dicarboxylate anions to form 1D chains along [0 0 1], and the resulting chains are assembled into double-chains based on interchain π?π interactions. The double-chains are further held together via hydrogen bonds into 2D supramolecular layers parallel to (1 0 0). The variable temperature magnetic measurements show an overall weak antiferromagnetic behavior for 1, and an weak ferromagnetic behavior over 300-75 K followed by antiferromagnetic behavior below 75 K for 2. 相似文献
2.
Two new squarato-bridged Fe(II) polymeric networks of molecular formula [Fe(squarate)(bpp)2(H2O)2] (1) and [Fe(squarate)(bpee)(H2O)2] (2) [bpp = 1,3-bis(4-pyridyl)propane; bpee = 1,2-bis(4-pyridyl)ethylene; ] have been synthesized and characterized by single-crystal X-ray diffraction studies and low temperature (300-2 K) magnetic measurements. Complex 1 is a 1D coordination chain of Fe(H2O)2 units connected by μ-O,O″ squarate dianions with monocoordinated bpp ligands dangling from the polymer. These 1D chains ultimately transform to a thick 2D layer through π-π interaction of pyridyl rings as well as through hydrogen bonds. Whereas structural determination of complex 2 reveals an inclined interpenetrated 3D architecture. Magnetic data for both the complexes 1 and 2 have been fitted using the Fisher formula for S = 2 system and show antiferromagnetic coupling for both the complexes. The best fit parameters are J = −0.40 cm−1, g = 2.30 and R = 0.01 for complex 1 and J = −0.49 cm−1, g = 2.08 and R = 1.9 × 10−3 for complex 2. 相似文献
3.
Ruihu Wang 《Inorganica chimica acta》2005,358(3):545-554
The reactions of 4-aminobenzoic acid (4-abaH), 4,4′-bipyridine (4,4′-bipy) and transitional metal ions (ZnII, MnII and CuII) gave rise to four supramolecular architectures, namely, [(4-abaH)2(4,4′-bipy)] (1), {[Zn2(4,4′-bipy)2(4-aba)4] (H2O)5}n (2), {[Mn(4,4′-bipy)2(H2O)4] (4-aba)Br(H2O)3} (3) and {[Cu2(4,4′-bipy)3(H2O)2(4-aba)2](NO3)2(H2O)4}n (4). Their crystal structures were determined by X-ray diffraction and show different structural motifs. 1 is a one-dimensional hydrogen bonding ladder constructed by 4-abaH and 4,4′-bipy. In 2, 4,4′-bipy bridges Zn(4-aba)2 units forming a one-dimensional zigzag chain, which is extended into a three-dimensional framework by crystalline water molecules through hydrogen bonding interactions. Three-dimensional network of 3 is constructed by mononuclear [Mn(4,4′-bipy)2(H2O)4]2+ cations, neutral crystalline water molecules, and 4-aba and Br− anions through extensive hydrogen bonding and π-π interactions. However, one-dimensional ladder formed by 4,4′-bipy and Cu(4-aba) units in 4 is extended into a three-dimensional architecture through interpenetration of the lateral 4-aba arms into squares of the adjacent Cu-(4,4′-bipy) ladders and extensive hydrogen bonding interactions. 相似文献
4.
Sébastien Floquet M. Carmen Muñoz Eric Rivière José-Antonio Réal 《Inorganica chimica acta》2009,362(1):56-449
This study reports the syntheses and the characterization of 12 ferric complexes of pyridoxal thiosemicarbazone. The richness of the coordination chemistry of this ligand is highlighted by the modulation of its charge from neutral H2L to anionic L2−, thus leading to a wide family of ferric compounds with charge varying from +3 to −1. The structures of complexes [Fe(HL)2]ClO4 · 2H2O and [Fe(HL)L] · 4.5H2O were solved and discussed with a particular attention brought to the intermolecular interactions occurring between the complexes. The investigation of magnetic properties of these compounds revealed that two of them are in the HS state at any temperature, whereas the others are in the LS state. These results are discussed in relation to the modulation of the electronic properties of the ligand. 相似文献
5.
The preparation and variable temperature-magnetic investigation of three squarate-containing complexes of formula [Fe2(OH)2(C4O4)2(H2O)4]·2H2O (1) [Cr2(OH)2(C4O4)2(H2O)4]·2H2O (2) and [Co(C4O4)(H2O)4]n (3) [H2C4O4 = 3.4-dihydroxycyclobutene-1,2-dione (squaric acid)] together with the crystal structures of 1 and 3 are reported. Complex 1 contains discrete centrosymmetric [Fe2(OH)2(C4O4)2(H2O)4] diiron(II) units where the iron pairs are joined by a di-μ-hydroxo bridge and two squarate ligands acting as bridging groups through adjacent oxygen atoms. Two coordinated water molecules in cis position complete the octahedral environment at each iron atom in 1. The iron-iron distance with the dinuclear unit is 3.0722(6) Å and the angle at the hydroxo bridge is 99.99(7)°, values which compare well with the corresponding ones in the isostructural compound 2 (2.998 Å and 99.47°) whose structure was reported previously. The crystal structure of 3 contains neutral chains of squarato-O1,O3-bridged cobalt(II) ions where four coordinated water molecules complete the six-coordination at each cobalt atom. The cobalt-cobalt separation across the squarate bridge is 8.0595(4) Å. A relatively important intramolecular antiferromagnetic coupling occurs in 1 whereas it is very weak in 2, the exchange pathway being the same [J = −14.4 (1) and −0.07 cm−1 (2), the spin Hamiltonian being defined as ]. A weak intrachain antiferromagnetic interaction between the high-spin cobalt(II) ions occurs in 3 (J = −0.30 cm−1). The magnitude and nature of these magnetic interactions are discussed in the light of their respective structures and they are compared with those reported for related systems. 相似文献
6.
Synthesis, structural characterization, and magnetic properties of a new cyano-bridged one-dimensional iron (III)-gadolinium (III) compound, trans-[Gd(o-phen)2(H2O)2(μ-CN)2Fe(CN)4]n · 2no-phen (o-phen = 1,10-phenanthroline), have been described. The compound crystallizes in the triclinic space group with the following unit cell parameters: a = 10.538(14) Å, b = 12.004(14) Å, c = 20.61(2) Å, α = 92.41(1)°, β = 92.76(1)°, γ = 112.72(1)°, and Z = 2. In this complex, each gadolinium (III) is coordinated to two nitrile nitrogens of the CN groups coming from two different ferricyanides, the mutually trans cyanides of each of which links another different GdIII to create -NC-Fe(CN)4-CN-Gd-NC- type 1-D chain structure. The one-dimensional chains are self-assembled in two-dimensions via weak C-H?N hydrogen bonds. Both the variable-temperature (2-300 K, 0.01 T and 0.8 T) and variable-field (0-50 000 Gauss, 2 K) magnetic measurements reveal the existence of very weak interaction in this molecule. The temperature dependence of the susceptibilities has been analyzed using a model for a chain of alternating classic (7/2) and quantum (1/2) spins. 相似文献
7.
Reaction of sodium picolinate with FeIII oxo-centered carboxylate triangles in MeCN in the presence of PPh4Cl yields (PPh4)[Fe4O2(O2CR)7(pic)2] (R = Ph (1), But (2)). Omitting the phosphonium cation produces [Fe8Na4O4(O2CPh)16(pic)4(H2O)4] (3), which contains two Fe4Na2 units bridged by two picolinate ligands. X-ray crystal structures of 1 and 3 are reported.Voltammetric profiles in MeCN show four one-electron reduction steps for complexes 1 and 2. Variable-temperature magnetic susceptibility measurements in polycrystalline samples of 1 and 3 reveal strong antiferromagnetic couplings leading to S = 0 ground states. 相似文献
8.
《Inorganica chimica acta》2004,357(1):25-32
Two compounds H[Mn(cyclam)(pyridine-2,6-dicarboxylate)2] · H2O (1) and [MnIII(cyclam)Cl2]ClO4 (2) (where cyclam=1,4,8,11-tetraazacyclotetradecane) have been synthesized and structurally characterized. The complex 1 crystallizes in the monoclinic space group P2(1)/c with a=11.4328(11), b=14.4275(14), c=8.5782(9) Å, , Z=2, R=0.0453. Complex 1 is octahedral in which [Mn(cyclam)]3+ unit occupies the basal plane having two pyridine-2,6-dicarboxylate anions in the axial positions. Molecular packing of the crystal is dominated by string of molecules along the b-axis. The strings are held together by extensive intermolecular hydrogen bonds involving N-H ? O, N-H ? N and O-H ? O which impart it an infinite 1D chain. Complex 2 on the other hand crystallizes in the space group P212121 (No. 19) of the orthorhombic system. Mn(III) ions occupy the center of a distorted octahedron and two chloride ions occupy the axial positions. The packing diagram of 2 reveals that the complex is percholrate-bridged hydrogen bonded 1D chain along a-axis. Cyclic voltammogram of complex 1 shows a reduction wave at −0.25 V coupled to an oxidation wave at −0.05 V versus SCE in aqueous solution. The complex 2 is characterized by an irreversible reduction wave at −0.11 V versus SCE and is identical to that observed for [MnIII(cyclam)Cl2]Cl · 5H2O. The magnetic measurements in the temperature range 1.9-300 K have been carried out for complex 1 which exhibits a very weak ferromagnetic interaction at low temperature. Complex 2 shows room temperature magnetic moment value of 4.92 BM consistent with the high spin d4 electronic configuration. 相似文献
9.
Qian Huang Li-Bo Liang Hong-Rong Zuo Le-Min Yang Xue-Lei Hu 《Inorganica chimica acta》2010,363(11):2546-2552
Three new ion-pair complexes, [4RBzDMAP]2[Cu(mnt)2] (mnt2− = maleonitriledithiolate; [4RBzDMAP]+ = 1-(4′-R-benzyl)-4-dimethylaminopyridinium, R = F(1), Cl(2) and Br(3)) were synthesized and characterized by elemental analyses, IR, UV, single crystal X-ray diffraction and magnetic measurements. The [Cu(mnt)2]2− anions and the cations stack alternately and form a 1D column via C-H···S, C-H···π or C-H···Cu interactions for 1 and 2. While the cations stack into a column though π···π or C-H···π interactions between pyridine and phenyl rings for 1 and 3. The change of the molecular topology of the counteraction when the 4-substituted group in the benzyl ring have been changed from F or Cl to Br atom, results in the difference in the crystal system, space group and the stacking mode of the cations and anions of 1, 2 and 3. Some weak hydrogen bonds between the adjacent columns further generate a 3D network structure. It is interesting that 1 and 2 exhibits antiferromagnetic coupling with θ = −2.372 K and θ = −14.732 K, while 3 shows weak ferromagnetic coupling feature with θ = 0.381 K. 相似文献
10.
Chunlin Ni 《Inorganica chimica acta》2005,358(9):2680-2686
Two novel ion-pair complexes, 1-(4′-bromo-2′-fluorobenzyl)isoquinolinium-bis(maleonitrile dithiolato)nickel(III), [BrFBzIQl] · Ni(mnt)2 · 0.5MeCN (1) and 1-(4′-bromo-2′-flourobenzyl)-quinolinium-bis(maleonitriledithiolato)nickel(III), [BrFBzQl] · Ni(mnt)2 (2) have been characterized structurally and magnetically. The anions and cations of 1 stack into columns in the solid state, respectively; and the Ni(III) ions form uniform stacking column with the Ni?Ni distances 4.061 Å within a column through intermolecular Ni?S, S?S, Ni?Ni or π?π interactions, while 2 forms 1D column of alternating between cations and anions via the hydrogen bonds, C?N, C?N, N?C, and π?π interactions. The changes of coupling constants were observed in these two complexes at 85 K for 1 and 70 K for 2. It is interesting that 1 undergoes a transition from antiferromagnetic to ferromagnetic phase and 2 does counter to that of 1. 相似文献
11.
Two trinuclear copper(II) complexes of a Schiff-base type N4O-donor ligand (LH) derived from 4,4,9,9-tetramethyl-5,8-diazadodecane-2,11-dione and 1,3-diaminopropan-2-ol are reported. Complex [Cu3L2(ClO4)4] (1) has an angular C2-symmetric trinuclear core as revealed from single-crystal X-ray diffraction studies. The terminal coppers are in square-pyramidal geometry with an N3O2 coordination environment while the central one is in octahedral geometry with an N2O4 donor environment. Complex [Cu3L2(ClO4)(N3)(H2O)](ClO4)2 · H2O (2) has an unsymmetrical trinuclear core with an intramolecular hydrogen bonding interaction between the water and azide anion coordinated to Cu(1) and Cu(3) center, respectively. All the copper centers in 2 are in square-pyramidal geometry. The average Cu?Cu distance between closest metal ions in both the complexes is 3.897 Å. The coordination environment of coppers in 1 approximately mimics that of multicopper oxidases in the oxidized form and the environment in 2 mimics that of the azide derivative of ascorbate oxidase. Both 1 and 2 exhibit doublet spin ground state due to strong antiferromagnetic coupling operating through the alkoxo-bridged oxygen atoms between the copper centers. 相似文献
12.
Qin-Xiang Jia 《Inorganica chimica acta》2010,363(14):3750-3756
Four coordination compounds of tetrazolate-5-carboxylate (tzc) with cobalt(II), [Co2(tzc)2(H2O)6]·2H2O (1), [Co2(tzc)2(phen)2(H2O)2]·2H2O (2), [Co2(tzc)2(2,2′-bpy)2(H2O)2]·H2O (3), and [Co(tzc)(4,4′-bpy)] (4), where phen = 1,10-phenanthroline, 2,2′-bpy = 2,2′-bipyridyl, and 4,4′-bpy = 4,4′-bipyridyl, have been synthesized by the hydrothermal methods involving the in situ generation of the ligand from sodium ethyl tetrazolate-5-carboxylate. Compounds 1, 2 and 3 all contain dinuclear molecules in which metal ions are linked by the double N-N bridges from two tzc ligands in the μ2-N1,O1:N2 mode, and the dinuclear molecules are associated into 3D architecture through extensive hydrogen bonding and π-π stacking interactions in various fashions. Compound 4 exhibits a two-dimensional layer structure in which Co(tzc) chains with μ3-N1,O1:O1:N2 tzc are cross-linked by 4,4′-bpy. Magnetic investigations on 1-3 revealed intramolecular ferromagnetic coupling through the double N-N bridges with intermolecular ferromagnetic or antiferromagnetic interactions. The interaction through the mixed N-N and μ2-Ocarboxylate bridges in 4 is antiferromagnetic. 相似文献
13.
Fei Wang 《Inorganica chimica acta》2010,363(6):1320-3958
Five novel complexes with two pyridine substituted benzotriazole ligands, 1-(2-pyridyl)benzotriazole (L1) and 1-(4-pyridyl)benzotriazole (L2), [Zn(L1)2Cl2] (1), [{Zn(L1)2Cl2}·(L1)2] (2), [Zn(L2)2Cl2] (3), [{Zn(L2)(H2O)3(μ2-SO4)}·H2O] (4), and [{Cd(L2)(H2O)3(μ2-SO4)}·H2O] (5) were synthesized. The details of the structures were characterized by X-ray single crystal analysis, revealing that these complexes were assembled together via supramolecular interaction, such as, hydrogen bonding and π-π interactions. The influence of organic ligands, anions and reaction conditions in the formation of the complexes were investigated. 相似文献
14.
A novel macrocyclic hexanuclear iron(III) 18-azametallacrown-6 compound, [Fe6(C9H7N2O3)6(CH3OH)6]·8CH3OH·2H2O, has been prepared using a trianionic pentadentate ligand N-acetylsalicylhydrazide (ashz3−) and characterized by X-ray diffraction. Due to the meridional coordination of the ligand to the Fe3+ ion, the ligand enforces the stereochemistry of the Fe3+ ions as a propeller configuration with alternating Λ/Δ forms. The disc-shaped hexanuclear ring shows about 6.20 Å in diameter at entrance, about 9.31 Å at its largest diameter at the center of the cavity, respectively. There are many kinds of intramolecular and intermolecular hydrogen bonds in the title compound. The OH?O hydrogen bond distances range from 2.609(5)-2.901(5) Å. The magnetic susceptibility (4-275K) study indicates antiferromagnetic exchange interactions between the adjacent Fe3+ ions around the ring. 相似文献
15.
Yang Yang 《Inorganica chimica acta》2011,376(1):401-407
A new mixed-ligand copper pentaborate, [Cu(en)2(C5H9NO)][B5O6(OH)4]2·C5H9NO (en is ethylenediamine) (1), with novel framework has been synthesized under mild solvothermal condition and characterized by FT-IR, elemental analyses, powder X-ray diffraction and TG-DTA. The structure consists of isolated polyborate anion [B5O6(OH)4]−, copper complex cation [Cu(en)2(C5H9NO)]+ and one C5H9NO molecule. The [B5O6(OH)4]− units are connected to one another through hydrogen bonds to form an interesting three-dimensional (3D) supramolecular framework with alternate square-like channels and rectangle-like channels along the c-axis as well as ellipse-like channels with 16-membered boron rings along the a-axis which are the largest channels in the pentaborate reported so far. The copper complex cation contains two kinds of ligands, en and C5H9NO, forming a square pyramid with an O atom as the vertex. 相似文献
16.
Marcos Flores-Alamo Alejandro Solano-Peralta Rubén A. Toscano Enrique Camarillo Héctor Murrieta 《Inorganica chimica acta》2004,357(15):4596-4601
This is the first reported example of a photochromic property presented by the change of a counterion in a coordination compound: the colour of the trans-[CrCl2(cyclam)]2ZnCl4 (1) is dark green while the trans-[CrCl2(cyclam)]Cl (2) is a reddish purple. The dark green colour of 1 under a fluorescent lamp changes to a deep purple when it is irradiated with an incandescent lamp; when the latter light is turned off, the dark green colour reappears instantaneously, this being a reversible process. Besides, the electron paramagnetic resonance (EPR) spectra of these polycrystalline samples show a very broad isotropic peak centred at g = 1.995 for 1 and for 2 a rhombic one at g = 4.309, 3.107 and 1.223. Their molar magnetic susceptibilities, χMdc, against temperature (2-300 K) follow Curie Weiss behaviour. For 1, a low antiferromagnetic coupling (θ = −2.78 K) in the solid state was found as it approaches 2 K, while for 2, there was found a smaller antiferromagnetic coupling (θ = −0.40 K). From the luminescence studies at 17 K, the lifetime for 1 was found to be twice that for 2. The crystal and molecular structure of 2 were determined and discussed. Compounds 1 and 2 show the same trans-RSSR configuration with different hydrogen bonding networks. In 1 the supramolecular array includes intermolecular interactions in which the chromium atoms interact through the zinc atom of the tetrachlorozincate counterion via hydrogen bonding with the extraordinary consequence of showing the previously described physical properties. This has been supported by theoretical calculations, in which it is clearly observed that the HOMO orbital of 1 is a highly delocalised molecular orbital among Cr(III)?Zn(II)?Cr(III), thus giving even more evidence for the strong Cr(III)-Cr(III) interaction through the ZnCl4 moiety via hydrogen bonding. 相似文献
17.
Shuai Zhang Yanning Cao Yanxiang Sun Yiping Chen Changcang Huang Xiaohong Yu 《Inorganica chimica acta》2007,360(8):2704-2710
Two new supramolecular compounds, [Ag(4,4′-bipy)]n [Ag(HBTC)]n (1) and [Cu(H2BTC)(2,2′-bipy)] (2) (HBTC/H2BTC = 1,2,4-benzenetricarboxylate, 4,4′-bipy/2,2′-bipy = 4,4′/2,2′-bipyridine), have been synthesized and characterized by elemental analyses, IR spectra, ultraviolet-visible diffuse reflection integral spectra (UV-Vis DRIS), fluorescent spectra, thermogravimetric analysis and single crystal X-ray diffraction analysis. It is noteworthy that there were two kinds of one-dimensional stairs-chain including cationic [Ag(4,4′-bipy)]n chain and anionic [Ag(HBTC)]n chain in 1. Furthermore, a two-dimensional double layer supramolecular framework was constructed through coordination bonds, hydrogen bonds, π-π stacking interactions and Ag?O weak coordinative interactions. The one-dimensional supramolecular chain of 2 was built from combining mononuclear [Cu(H2BTC)(2,2′-bipy)] by inter- and intra-molecular hydrogen bonding interactions. Additionally, the two complexes exhibit intense blue or olivine luminescence at room temperature. 相似文献
18.
Marvadeen A. Singh-Wilmot Roxan U. Richards-Johnson Alan J. Lough 《Inorganica chimica acta》2007,360(12):3727-3732
[Na2[Ln2(sal)4(CF3SO3)2(H2O)4](CF3SO3)2]n Ln = Nd (1) and Eu (2) were synthesized from the reaction of salicylaldehyde, lanthanide(III) triflates, and sodium hydroxide. The compounds are iso-structural and possess a 2-D supramolecular network built up from discrete dinuclear Ln(III) units [Ln2(sal)4(CF3SO3)2(H2O)4] via exo-coordination of Na(CF3SO3). The sal ligands display μ2-O coordination modes involving both the phenolic and carbonyl oxygen atoms while the triflates function as both μ2 and μ3 bridges. Each Ln(III) in the network is eight coordinate and in bicapped trigonal prism coordination geometry. Luminescence from [Na2[Eu2(sal)4(CF3SO3)2(H2O)4](CF3SO3)2]n showed temperature dependent sensitized emission with significant quadrupolar contribution and decay dynamical studies followed single exponential kinetics. Together these results indicate that in the presence of Na+ ions, sal, and triflate are useful ligands in the construction of Ln(III) coordination polymers with unusual luminescence and structures. 相似文献
19.
Nouri Bouslimani Guillaume Rogez Sylvie Choua Richard Welter 《Inorganica chimica acta》2010,363(1):213-220
We report experimental evidences including molecular solid-state structure determinations, magnetic measurements and EPR studies for the formation (in the solid-state) of novel dinuclear (μ-OMe)2(L)4 complexes (HL are 2-ylidenhydrazidebenzoic-1,3-dithiolane acid and N′-cyclopentylidene-2-hydroxybenzohydrazide). The two novel dinuclear iron compounds described in the present contribution exhibit antiferromagnetic intra-molecular coupling. Crystal structures of the supporting ligands as well as one mononuclear species have also been determined. 相似文献
20.
A new flexible aromatic multithiocarboxylate ligand: 1,4-benzenebis(thioacetic acid) (H2L), was synthesized and introduced to construct three interesting metal-organic frameworks (MOFs) with the photoluminescent properties. Three MOFs were characterized by the elemental analysis, infrared (IR) spectrum, and single crystal X-ray diffraction. [Zn3L3(2,2′-bipy)2]n (1) is a two-dimensional (2D) layered architecture that consists of the linear trinuclear units of Zn atoms. [ZnL(2,2′-bipy)(H2O)]n·0.7nH2O (2) is a one-dimensional (1D) helical chain, which further forms a 2D structure with 30-membered ring with a size of 7.64 × 15.53 Å via O−H···O hydrogen bonds. [ZnL(phen)(H2O)]n·0.35nH2O (3) presents a 2D supramolecular network through the O−H···O interactions. Their thermal and photoluminescent properties in solid state were given. 相似文献