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1.
Six new dinuclear complexes, derived from cis-[Co(H2O)2(NH3)4]3+, cis-[Co(H2O)2(en)2]3+ and [M(CN)42? (M = Ni, Pd, Pt) were prepared and characterized by means of chemical analysis, electronic and IR measurements. The influence of the pH on the rate of the reaction was studied for the two derivatives of [Pd(CN)4]2?, showing that the best conditions to obtain the dinuclear compounds are at pH near 6, where the predominant species are cis-[Co(OH)(H2O)(amine)2]2+. The [Pt(CN)4]2? derivatives show PtPt interactions both in the solid state and in solution. 相似文献
2.
Xiaohua Chen L. Zhu Xiaozeng You Nenad M. Kostić 《Journal of biological inorganic chemistry》1998,3(1):1-8
Dipeptides and tripeptides AcMet-aaH containing N-acetyl methionine, in which the group aaH is GlyH, AlaH, ValH, or Gly-GlyH, undergo hydrolytic cleavage of the Met-aaH peptide
bond in the presence of the following complexes of palladium(II): cis-[Pd(en)(H2O)2]2+, cis-[Pd(tn)(H2O)2]2+, cis-[Pd(en)(CH3OH)2]2+, cis-[Pd(S,N-MetH)(H2O)2]2+, cis-[Pd(S,N-Met-GlyH)(H2O)2]2+, and cis-[Pd(S,N-Met-AlaH)(H2O)2]2+. These mononuclear complexes are precursors of binuclear palladium(II) complexes containing the substrates AcMet-aaH as bridging
thioether ligands. The rate constant for cleavage is higher when the bidentate ligand in the precursor complex is ethylenediamine
(which is completely displaced) than S,N-methionine (of which only the amino group is displaced), because the number of aqua ligands available for cleavage is greater
in the former than in the latter case. The demonstrated dependence of the rate constant on the steric bulk (volume) of the
leaving group, aaH, points the way toward achieving a degree of sequence selectivity in cleavage of peptide bonds by palladium(II)
aqua complexes. One equivalent of cis-[Pd(en)(H2O)2]2+ cleaves as many as ten equivalents of AcMet-GlyH, but the rate constant decreases as the molar excess of the dipeptide over
the catalyst increases. This demonstration of catalytic turnover points the way to our ultimate goal – artificial metallopeptidases.
Received: 13 June 1997 / Accepted: 24 September 1997 相似文献
3.
We have reacted [Pt(dien)Cl]Cl, [Pt(en)(D2O)2]2+, and [Pt(Me4en)(D2O)2]2+ [Me4en = N,N,N′,N′-tetramethylethylenediamine] with selenomethionine (SeMet). When [Pt(dien)Cl]Cl is reacted with SeMet, [Pt(dien)(SeMet-Se)]2+ is formed; two Se-CH3 resonances are observed due to the different chiralities at the Se atom upon platination. In a reaction of [Pt(dien)Cl]Cl with an equimolar mixture of SeMet and Met, the SeMet product forms more quickly though a slow equilibrium with approximately equal amounts of both products is reached. [Pt(Me4en)(D2O)2]2+ reacts with SeMet to form [Pt(Me4en)(SeMet-Se)(D2O)]2+ initially but forms [Pt(Me4en)(SeMet-Se,N)]+ ultimately. One stereoisomer of the chelate, assigned to the R chirality at the Se atom, dominates within the first few minutes of reaction. [Pt(en)(D2O)2]2+ forms a variety of products depending on reaction stoichiometry; when one equivalent or less of SeMet is added, the dominant product is [Pt(en)(SeMet-Se,N)]+. In the presence of excess SeMet, [Pt(en)(SeMet-Se)2]2+ is the dominant initially, but displacement of the en ligand occurs leading to [Pt(SeMet-Se,N)2] as the eventual product. Displacement of the en ligand from [Pt(en)(SeMet-Se,N)]+ does not occur. In reactions of K2PtCl4 with two equivalents of SeMet, [Pt(SeMet-Se,N)2] is formed, and three sets of resonances are observed due to different chiralities at the Se atoms. Only the cis geometric isomers are observed by 1H and 195Pt NMR spectroscopy. 相似文献
4.
5.
Sneana Rajkovi Biljana . Glii Marija D.
ivkovi Milo I. Djuran 《Bioorganic chemistry》2009,37(5):173-179
1H NMR spectroscopy was applied to study the reactions of cis-[Pd(L)(H2O)2]2+ complexes (L is en, pic and dpa) with the N-acetylated tripeptides L-methionylglycylglycine, MeCOMet–Gly–Gly, and glycyl–L-methionyl–glycine, MeCOGly–Met–Gly. All reactions were performed in the pH range 2.0–2.5 with equimolar amounts of the cis-[Pd(L)(H2O)2]2+ complex and the tripeptide at 60 °C. The hydrolytic reactions of the cis-[Pd(en)(H2O)2]2+, cis-[Pd(pic)(H2O)2]2+ and cis-[Pd(dpa)(H2O)2]2+ complexes with MeCOMet–Gly–Gly were regioselective and only the amide bond involving the carboxylic group of methionine was cleaved. However, in the reactions of these three Pd(II) complexes with MeCOGly–Met–Gly, two amide bonds, Met–Gly and MeCO–Gly, were cleaved. From UV–Vis spectrophotometry studies, it was found that the rate-determining step of these hydrolytic reactions is the monodentate coordination of the corresponding Pd(II) complex to the sulfur atom of the methionine side chain. The rate of the cleavage of these amide bonds is dependent on the nature of the bidentate coordinated diamine ligand L (en > pic > dpa). The hydrolytic reaction of cis-[Pd(L)(H2O)2]2+-type complexes with MeCOMet–Gly–Gly, containing the methionine side chain in the terminal position of the peptide, is regioselective while in the reaction of these Pd(II) complexes with MeCOGly–Met–Gly, none selective cleavage of the peptide occurs. This study contributes to a better understanding of the selective cleavage of methionine-containing peptides employing palladium(II) complexes as catalysts. 相似文献
6.
Copper(II) cations coordinated with PMDTA (pentamethyldiethylenetriamine) and TMEDA (tetramethylethylenediamine) possess a high synthetic potential. The synthesis of these cations was carried out by metathesis reactions with silver salts. The cationic copper(II) complexes, [Cu(PMDTA)(Me2CO)Cl]+, [Cu(PMDTA)(H2O)Cl]+, [Cu(PMDTA)(DMF)]+, [Cu(PMDTA)Cl]+, [Cu(PMDTA)OAc]+, [Cu(PMDTA)(MeCN)2]2+, [Cu2(TMEDA)2Cl3]+ and [Cu(TMEDA)(MeCN)3]2+ were synthesised as PF6 salts, crystallised and characterised by single-crystal X-ray diffraction. 相似文献
7.
Complexes of Co(II), Ni(lI), Cu(II), Zn(II) and Pt(II) with 1-formylisoquinoline thiosemicarbazone (1-iqtsc-H) were prepared and characterized by elemental analyses, conductance measurement and spectral studies. On the basis of these studies a distorted octahedral structure for [Co(1-iqtsc)2]·2H2O, a distorted trigonal-bipyramidal structure for [Ni- (1-iqtsc-H)Cl2], [Cu(1-iqtsc-H)Cl2] and [Zn(1-iqtsc- H)(OAc)2]·H2O and a square-planar structure for [Pt(1-iqtsc)Cl] are suggested. All these metal(II) complexes were screened for their antitumour activity in the P388 lymphocytic leukaemia test system in mice. Except for Pt(Il), the complexes were found to possess significant activity; the Ni(II) complex showed a T/C value of 161 at the optimum dosage. 相似文献
8.
Kalagouda B. Gudasi Siddappa A. Patil Rashmi V. Shenoy Sim Wan Annie Bligh 《Inorganica chimica acta》2006,359(10):3229-3236
The chelating behavior of 2,6-diacetylpyridine bis(2-aminobenzoylhydrazone) (H2dapa) towards manganese(II), cadmium(II) and oxovanadium(IV) ions has been studied by elemental analyses, conductance measurements, magnetic properties and spectral (IR, 1H NMR, UV-Vis and EPR) studies. The IR spectral studies suggest the pentadentate nature of the ligand with pyridine nitrogen, two azomethine nitrogens and two carbonyl oxygen atoms as the ligating sites. Six coordinate structure for [VO(H2dapa)]SO4 · H2O and seven coordinate structures for [Mn(H2dapa)(Cl)(H2O)]Cl · 2H2O and [Cd(H2dapa)Cl2] · H2O complexes have been proposed. Pentagonal bipyramidal geometry for [Mn(H2dapa)(Cl)(H2O)]Cl · 2H2O and [Cd(H2dapa)(Cl2)] · H2O complexes was confirmed by single crystal analysis. The X-band EPR spectra of the oxovanadium(IV) and manganese(II) complexes in the polycrystalline state at room (300 K) and also at liquid nitrogen temperature (77 K) were recorded and their salient features are reported. 相似文献
9.
Abstract The 1H NMR relaxation effects produced by paramagnetic Cr(III) complexes on nucleoside 5′-mono- and -triphosphates in D2O solution at Ph′=3 were measured. The paramagnetic probes were [Cr(III)(H2O) 6]3+, [Cr(III)(H2O)3 (HATP)], [Cr(III)(H2O)3(HCTP)] and [Cr(III) (H2O)3(UTP)?, while the matrix nucleotides (0.1 M) were H2AMP, HIMP?, and H2ATP2-. For the aromatic base protons, the ratios of the transverse to longitudinal paramagnetic relaxation rates (R2p/R1p) for the [Cr(III)(H2O)6]3+/H2ATP2-, [Cr(III)(H2O)3(HATP)]/H2ATP2-, [Cr(III)(H2O)3(HCTP)]/H2ATP2 and [Cr(III)(H2O)3(UTP)]?/H2ATP2 systems were below 2.33 so the dipolar term predominates. For a given nucleotide, R1p for the purine H(8) signal was larger than for the H(2) signal with the [Cr(III)(H2O)6]3+ probe, while R1p for the H(2) signal was larger with all the other Cr(III) probes. Molecular mechanics computations on the [Cr(III)(H2O)4(HPP)(α,β)], [Cr(III)(NH3)4(HPP)(α,β)], [Co(III)(NH3)3(H2PPP)(α,βγ)] and [Co(III)(NH3)4(HPP)(α,β)] complexes gave calculated energy-minimized geometries in good agreement with those reported in crystal structures. The molecular mechanics force constants found were then used to calculate the geometry of the inner sphere [Cr(III)(H2O)6]3+ and [Cr(III)(H2O)3(HATP)(α,βγ)] complexes as well as the structures of the outer sphere [Cr(III) (H2O)6]3+-(H2AMP) and [Cr(III)(H2O)6]-(HIMP)? species. The gas-phase structure of the [Cr(III)(H2O)3(HATP)(α,βγ)] complex shows the existence of a hydrogen bond interaction between a water ligand and the adenine N(7) (O…N = 2.82 Å). The structure is also stabilized by intramolecular hydrogen bonds involving the -O(2′)H group and the adenine N(3) (O…N = 2.80 Å) as well as phosphate oxygen atoms and a water molecule (O…O = 2.47 Å). The metal center has an almost regular octahedral coordination geometry. The structures of the two outer-sphere species reveal that the phosphate group interacts strongly with the hexa-aquochromium probe. In both complexes, the nucleotides have a similar “anti” conformation around the N(9)-C(l′) glycosidic bond. However, a very important difference characterizes the two structures. For the (HIMP)? complex, strong hydrogen bond interactions exist between one and two water ligands and the inosine N(7) and O(6) atoms, respectively (O…O = 2.63 Å O…N = 2.72, 2.70 Å). For the H2AMP complex, the [Cr(III) (H2O)c]3+ cation does not interact with N(7) since it is far from the purine system. Hydrogen bonds occur between water ligands and phosphate oxygens. The Cr-H(8) and Cr-H(2) distances revealed by the energy-minimized geometries for the two outer sphere species were used to calculate the R1p values for the H(8) and H(2) signals for comparison with the observed R1p values: 0.92(c), 1.04(ob) (H(8)) and 0.06(c), 0.35(ob) (H(2)) for H2AMP; and 3.76(c), 4.53(ob) (H(8)) and 0.16(c), 0.77(ob) s?1 (H(2)) for HIMP?. These results suggest that the dynamic relaxation effects can be only partially understood with molecular mechanics computations, although the success of the geometry calculations suggests that future efforts in the development of computational methods are justified. 相似文献
10.
R. Vijayalakshmi V. Subramanian Balachandran Unni Nair 《Journal of biomolecular structure & dynamics》2013,31(6):1063-1071
Abstract Molecular modeling and energy minimisation calculations have been used to investigate the interaction of chromium(III) complexes in different ligand environments with various sequences of B-DNA. The complexes are [Cr(salen)(H2O)2]+; salen denotes 1, 2 bis-salicylideneaminoethane, [Cr(salprn)(H2O)2]+; salprn denotes 1, 3 bis- salicylideneamino-propane, [Cr(phen)3]3+; phen denotes 1, 10 phenanthroline and [Cr(en)3]3+; en denotes eth- ylenediamine. All the chromium(III) complexes are interacted with the minor groove and major groove of d(AT)12, d(CGCGAATTCGCG)2 and d(GC)12 sequences of DNA. The binding energy and hydrogen bond parameters of DNA-Cr complex adduct in both the groove have been determined using molecular mechanics approach. The binding energy and formation of hydrogen bonds between chromium(III) complex and DNA has shown that all complexes of chromium(III) prefer minor groove interaction as the favourable binding mode. 相似文献
11.
Recent ab initio studies reported in the literature have challenged the mechanistic assignments made on the basis of volume of activation data [1,2]. In addition to that ab initio molecular orbital calculations on hydrated zinc(II)-ions were used to elucidate the general role of this ion in metalloproteins [3]. Due to our interest in both inorganic reaction mechanisms and enzymatic catalysis we started a systematic investigation of solvent exchange processes on divalent zinc-ion using density functional calculations. Our investigations cover aqua complexes of the general form [Zn(H2O)n]2+·mH20 with n=3-6 and m=0-2, where n and m represent the number of water molecules in the coordination and solvation sphere, respectively.The complexes [Zn(H2O)5]2+·2H2O and [Zn(H2O)4]2+·2H2O turnend out to be the most stable zinc complexes with seven and six water molecules, respectively. This implies that a heptacoordinated zinc(II) complex, where all water molecules are located in the co-ordination sphere, should be energetically highly unfavorable and that [Zn(H2O)6]2+ can quite readily push two coordinated water molecules into the solvation sphere. For the pentaqua complex [Zn(H2O)5]2+ only one water molecule is easily lost to the solvation sphere, which makes the [Zn(H2O)4]2+·H2O complex the most favorable in order to consider the limiting dissociative and associative water exchange process of hexacoordinated zinc(II). The dehydration and hydration energies using the most stable zinc(II) complexes [Zn(H2O)4]2+·2H2O, [Zn(H2O)5]2+·2H2O and [Zn(H2O)4]2+·H2O were calculated to be 24.1 and -21.0 kcal/mol, respectively. 相似文献
12.
Two new nickel(II) complexes of the composition [Ni(cyclam)(Hdipic)2] · 2H2O (1) and [Ni(cyclam)(H2O)2][Ni(dipic)2] · 2.5H2O (2) (cyclam = 1,4,8,11-tetraazacyclotetradecane) have been prepared and structurally characterized by a combination of analytical, spectroscopic, thermogravimetric, and crystallographic methods. The structure of 1 shows that the central nickel(II) ion is coordinated axially by two monodentate Hdipic ligands. The discrete neutral complex 1 further extends its structure by hydrogen bonding interactions to form a one-dimensional supramolecule. The structure of 2 consists of two independent nickel(II) centers. Water molecules instead of dipic ligands prefer to coordinate to the Ni1 ion forming a divalent cation [Ni(cyclam)(H2O)2]2+. Two dipic ligands coordinate to the second Ni2 ion forming a divalent anion [Ni(dipic)2]2−. The divalent cations and anions are charge-balanced, resulting in a molecular salt. The divalent cations and anions are interconnected by multiple types of hydrogen bonding interactions. 相似文献
13.
Complexes of the types cis- and trans-Pt(amine)2I2 containing cyclic amines were synthesized and studied mainly by IR and multinuclear NMR spectroscopies. The compounds were converted to cis- and trans-Pt(amine)2(NO3)2, which were also investigated. The hydrolysis and the aquation reactions of the latter compounds were then studied in D2O in different conditions of pH. In acidic medium, the aqueous product is [Pt(amine)2(D2O)2]2+ and for a few amines, [Pt(amine)2(D2O)(NO3)]+ was detected. In basic pH, the main product is Pt(amine)2(OD)2 and Pt(amine)2(OD)(NO3) was detected for several compounds. In neutral pH, the cis isomers form between two and four species in fresh solutions. The most shielded species in 195Pt NMR is the monoaqua-monohydroxo complex cis-[Pt(amine)2(D2O)(OD)]+ and the less shielded compound is the dihydroxo-bridged dimer [Pt(amine)2(μ-OD)2Pt(amine)2]2+, which were observed for all the compounds. For a few amines, the monohydroxo-bridged dimer [Pt(D2O)(amine)2(μ-OD)Pt(OD)(amine)2]2+ was detected and for cyclohexylamine, a fourth signal was assigned to a cyclic hydroxo-bridged trimer [(Pt(amine)2(μ-OD))3]3+. 195Pt NMR spectroscopy has shown that the concentration of the monomer decreases with time, while the concentration of the dimers increases. Only one product was observed for the trans isomers in neutral pH. The signal was assigned to the monoaqua-monohydroxo species trans-[Pt(amine)2(D2O)(OD)]+. The 13C and 1H NMR spectra of most of the complexes were measured. All the coupling constants 2,3J(195Pt-1H) and 2,3J(195Pt-13C) are larger in the cis compounds than in the trans isomers. 相似文献
14.
《Inorganica chimica acta》1986,120(1):11-14
Products of the reduction of [CoNO2(NH3)5]2+ by Cr2+ were separated and identified under the conditions of [Cr2+]0/[Co(IlI)]0⩽3 and 0.02 M ⩽[H+] ⩽ 0.75 M. The product distribution was dependent on both [Cr2+]o and [H+]. The following mechanism is proposed: [CoNO2(NH3)5]2+ + Cr2+→Co2+ + [CrONO(H2O)5]2+ (i) [CrONO(H2O)5]2+ + H+→[Cr(H2O)6]3+ + HNO2 (ii) [CrONO(H2O)5]2+ + Cr2+→Cr(IV) + [CrNO(H2O)5]2+ (iii) Cr(IV) + Cr2+→[(H2O)4Cr(OH)2Cr(H2O)4]4+ (iv) HNO2 + 2Cr2+→[Cr(H2O)6]3+ + [CrNO(H2O)5]2+ (v) 相似文献
15.
The interaction of guanine, guanosine or 5′-GMP (guanosine 5′-monophosphate) with [Pd(en)(H2O)2](NO3)2 and [Pd(dapol)(H2O)2](NO3)2, where en is ethylenediamine and dapol is 2-hydroxy-1,3-propanediamine, were studied by UV-Vis, pH titration and 1H NMR. The pH titration data show that both N1 and N7 can coordinate to [Pd(en)(H2O)2]2+ or [Pd(dapol)(H2O)2]2+. The pKa of N1-H decreased to 3.7 upon coordination in guanosine and 5′-GMP complexes, which is significantly lower than that of ∼9.3 in the free ligand. In strongly acidic solution where N1-H is still protonated, only N7 coordinates to the metal ion, but as the pH increases to pH ∼3, 1H NMR shows that both N7-only and N1-only coordinated species exist. At pH 4-5, both N1-only and N1,N7-bridged coordination to Pd(II) complexes are found for guanosine and 5′-GMP. The latter form cyclic tetrameric complexes, [Pd(diamine)(μ-N1,N7-Guo]44+ and [Pd(diamine)(μ-N1,N7-5′-GMP)]4Hx(4−x)−, (x=2,1, or 0) with either [Pd(en)(H2O)2](NO3)2 or [Pd(dapol)(H2O)2](NO3)2. The pH titration data and 1H NMR data agree well with the exception that the species distribution diagrams show the initial formation of the N1-only and N1,N7-bridged complexes to occur at somewhat higher pH than do the NMR data. This is due to a concentration difference in the two sets of data. 相似文献
16.
The rate of phosphate hydrolysis of ATP in the substitution-inert complex Co(NH3)4ATP-has been examined in the presence and absence of [Co(cyclen)(H2O)2]3+. The rate of hydrolysis of Co(NH3)4ATP- in the absence of [Co(cyclen)(H2O)2]3+ is essentially independent of pH in the range 6.0 to 9.0, and the rate constant is 2.6 × 10?5 sec ?1 at pH 9.0, 40°C, and 1.0 M ionic strength Rate constants for the hydrolysis of Co(NH3)4ATP- in the presence of [Co(cyclen)(H2O)2]3+ are sharply dependent upon pH in the same range. The rate constants at pH 8.0, 8.6, and 9.0 are 8, 63, and 95 times larger than the rate constant at pH 7.0. At pH 9 the rate constant is 1.2 × 10?3 sec?1 for 16 mM Co(NH3)4ATP- in the presence of 10 mM [Co(cyclen)(H2O)2]3+. The proposed mechanism for hydrolysis involves the coordination of a phosphate group of Co(NH3)4ATP- by [Co(cyclen)(H2O)2]3+ to form a dinuclear species, followed by internal attack of coordinated hydroxide on the phosphate chain. 相似文献
17.
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
18.
Hydrothermal reactions between H4ODPA (2,2′,3,3′-oxydiphthalic acid) and metal ion salts of Ba2+, Cu2+, Zn2+ and Gd3+ afford four novel coordination polymers [Ba(H2ODPA)(H2O)4] · H2O (1), [Cu2(ODPA)(H2O)3] · H2O (2), Zn2(ODPA)(H2O)2 (3) and [Gd(HODPA)(H2O)3.5] · H2O (4), accordingly. These polymers show great differences in regard to their structures and properties originated from the variation of size and coordination geometry of the metal ions. Compound 1 presents puckered achiral layer structure with (4.82) topology with helices, 2 has a 63 topology with copper tetramer as SBUs, 3 has chiral layer with two kinds of helices built up from Zn-binuclear “paddle-wheel” like SBUs, and 4 features a simple 1D helix with opposite chirality. Compound 3 shows obvious fluorescent emissions upon excitation. Compound 2 shows ferromagnetic interactions between CuII centers bridged by carboxylate groups, whereas compound 4 presents weak ferromagnetic interaction between GdIII ions. 相似文献
19.
Song Gao Jingxiang Zhao Baibin Zhou Kai Yu Zhanhua Su Lu Wang Yongkui Yin Zhifeng Zhao Yang Yu Ying Chen 《Inorganica chimica acta》2011,379(1):151
A series of novel polytungstates, [{Cu(bim)(H2O)2}4(H4W12O42)]·14H2O 1, (Himi)6[{Mn(imi)(H2O)}(H4W12O42)]·2H2O 2, [{Cu0.5(H2O)}2{Cu0.5(H2O)2}2{Cu (bim)(H2O)2}2(H4W12O42)]·10H2O 3 and [{Na(H2O)4}2{Cu0.5(H2O)}4{Cu0.5 (H2O)1.5}2(H4W12O42)]·3H2O 4 (imi = imidazole; bim = 2,2′-biimidazole), have been obtained by the routine synthetic reactions in aqueous solution and characterized by IR, X-ray powder diffraction, UV, elemental analysis, TG and X-ray single-crystal diffraction. All the compounds contain the [H4W12O42]8− polyanions as building units. Compound 1 is isolated structure, which is modified with four {Cu(bim)(H2O)2}2+ fragments. The compound 2 exhibits an infinite 1D “wave-like” chain based on the interaction between the [H4W12O42]8− polyanion and [Mn(imi)(H2O)]2+ complex. The 2D layered structure of the compound 3 is formed by the interconnection 1D [{Cu0.5(H2O)}2(H4W12O42)]6− and [{Cu0.5(H2O)2}2(H4W12O42)]6− chains. While compound 4 can be abstracted of structural topology with (6,2)-connected 3D network. In addition, the electrochemical properties of these compounds are investigated. 相似文献
20.
《Inorganica chimica acta》1986,115(2):187-192
195-Platinum NMR spectra are reported for a series of complexes of bidentate ligands [Pt(LL)X4] (X=Cl, Br; LL=diphosphine, diarsine, dithioether, diselenoether), [Pt(Me2PCH2CH2PMe2)2X2]X2, [Pt(o-C6H4(AsMe2)2)2X2]X2, and for the Pt(II) analogues. The trends in chemical shifts δ(Pt) and 1J(PtP), 1J(PtSe) coupling constants are discussed, and used to establish the nature of the solution species obtained by oxidation of Pt(II) complexes of some multidentate phosphorus and arsenic ligands. The [Pt(LL)I4] materials are shown to exist as [PtII(LL)I2] in dimethylsulphoxide solution, but [Pt(o-C6H4(AsMe2)2)2I2]2+ is a genuine Pt(IV) iodo-complex. 相似文献