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Journal ArticleDOI

Monomeric Pt(II) and Pd(II) complexes with Creatinine. Crystal structure of tetrakis-(Creatinine) platinum(II) diperchlorate

01 Jan 1988-Polyhedron (Pergamon)-Vol. 7, Iss: 14, pp 1273-1278
TL;DR: Pt(II) and Pd(II)-complexes with creatinine, C3H2N2(O)(CH3)NH2, were synthesized in this paper and a model for coordination of the ligands to the central atoms was confirmed by X-ray structural investigation.
About: This article is published in Polyhedron.The article was published on 1988-01-01. It has received 26 citations till now. The article focuses on the topics: Crystal structure.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a review of guanidine copper compounds with an emphasis on structural characteristics and their application in bioinorganic chemistry and catalysis is presented. But the focus of this paper is on the use of the guanidines as neutral donor ligands in copper coordination.
Abstract: Abstract In this paper, guanidine copper compounds are reviewed with an emphasis on structural characteristics and their application in bioinorganic chemistry and catalysis. The literature survey includes the copper coordination chemistry of biological guanidine derivatives, peralkylated guanidines including bicyclic ones and of further nitrogen-rich guanidine-type systems such as azoimidazoles, triazolopyrimidines and triaminoguanidines. From a sporadic interest dating back to the 1960s, research on this ligand class and its use in copper coordination chemistry has gained new impetus since 2000. With the synthesis of examples with sophisticated substitution at the characteristic CN3 framework, complex problems can be addressed in several fields of chemistry. This paper analyses the different types of guanidines for their special donor properties and highlights the specific advantages of guanidines as neutral donor ligands in copper coordination chemistry where a great variety of coordination modes was found. These compounds offer the ability to distribute the formal positive charge of the metal throughout the guanidine unit and represent more than simple σ-donating ligands.

66 citations

Journal ArticleDOI
TL;DR: In this paper, the 1:1 proton transfer compound LH2, (creatH)+ (pydcH)−, has been prepared from the reaction of creatinine, creat, and dipicolinic acid, pydc h2, pyridinedicarboxylic acid, and characterized using IR, 1H and 13C NMR spectroscopy.
Abstract: The 1:1 proton transfer compound LH2, (creatH)+ (pydcH)−, has been prepared from the reaction of creatinine, creat, and dipicolinic acid, pydcH2, (2, 6- pyridinedicarboxylic acid) and characterized using IR, 1H and 13C NMR spectroscopy. The first coordination complex (creatH)[Zn(pydc)(pydcH)]·4H2O, was prepared using LH2 and zinc(II) nitrate, and characterized using IR, 1H and 13C NMR spectroscopy and single crystal X-ray crystallography. The crystal system is triclinic with space group with two molecules per unit cell. The unit cell dimensions are a = 8.085(2) A, b = 10.802(4) A, c = 13.632(4) A, α = 104.98(2)°, β = 90.31(2)° and γ = 92.55(3)°. The structure has been refined to a final value for the crystallographic R factor of 0.0381 based on 3003 reflections. The zinc atom is six-coordinated with a distorted octahedral geometry. The (pydc)2− and (pydcH)− units are almost perpendicular to each other. Extensive hydrogen bondings between carboxylate groups, (creatH)+ and water molecules throughout the zinc(II) complex as well as π–π stacking and ion pairing play important roles in stabilizing the corresponding lattices. The protonation constants of the building blocks of the pydcH2-creat adduct, the equilibrium constants for the reaction of (pydc)2− with creat and the stoichiometry and stability of the ZnII complex with LH2 in aqueous solution were accomplished by potentiometric pH titration. The solution studies support a self-associated (creatH)+(pydcH)− as the most abundant species at pH = 3.4. The stoichiometry of the crystalline complex (i.e. (creatH) [Zn(pydc)(pydcH)])and that of the most abundant species detected in solution were found the same.

54 citations

Journal ArticleDOI
TL;DR: In this article, the pulsed laser photolysis (excimer laser, XeCl; 308 nm) of the PtCl 6 2−creatinine-methanol system was studied.
Abstract: The pulsed laser photolysis (excimer laser, XeCl; 308 nm) of the PtCl 6 2− —creatinine—methanol system was studied. The formation of an intermediate Pt III species (PtCl 5 2− cr, where cr = creatinine) was demonstrated and its decay kinetics were examined. Some kinetic and thermodynamic data of the photoinduced reaction were determined. The photolysis of the same system using stationary irradiation was also investigated allowing the end product of the reaction to be determined.

35 citations

Journal ArticleDOI
Mariana Mitewa1
TL;DR: In this article, the ability of the important bioligands creatinine and creatine to form various types of complexes with different metal ions is summarized and the crucial role of the nature of the reaction medium in complex formation with these ligands is emphasized.

34 citations

Journal ArticleDOI
TL;DR: Spectroscopic and structural study of a newly synthesized heteroligand complex of copper with creatinine and urea has been discussed and the complex is found to be rigid and stable in its monomeric form at very low concentrations.

24 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the crystal and molecular structure of creatinininium tetrachlorocuprate (II) was described and the structure was solved by X-ray diffraction studies and was refined by least-squares methods to R = 0.041 for 1344 reflections.

40 citations

Journal ArticleDOI
TL;DR: The first unambocal, crystallographically characterized mononuclear platinum(III) complex, [Pt(C6Cl5)4]−, has just been reported in this article.
Abstract: Platinum(III) is no longer an uncommon oxidation state. Numerous binuclear platinum(III) complexes have been prepared and structurally characterized over the past eight years. These include sulfate-bridged dimers of D4h symmetry, [Pt2(SO4)4L2]2−, L = H2O, DMSO; phosphate-bridged complexes [Pt2(HPO4)4-(H2O)2]2− and [Pt2(H2PO4)(HPO4)3(py)2]−; POP (H2 P2 O2−5)-bridged ions [Pt2-(POP)4X2]2−, X = halide; an extensive series of α-pyridonate (C5H4NO−)-bridged head-to-head and head-to-tail complexes, [Pt2(NH3)4 (C5H4NO)2XY]n−, X, Y = NO3, NO2, H2O, Cl, Br; n = 2, 3; and organometallic derivatives such as [Pt2(CH3)4-(CF3CO2)2(4-Mepy)2]. In all cases there is a Pt–Pt single bond of length 2.47–2.7 A, pseudo-octahedral geometry about platinum, and two or more bridging ligands. The complexes are stable in solution and some undergo quasi-reversible two-electron redox reactions. Mononuclear platinum(III) complexes are less well characterized structurally, but have been stabilized in diamagnetic host lattices in the solid state and by macrobicyclic cage ligands in solution following pulse radiolytic or γ-irradiation of precursor platinum(II) complexes. The first unequivocal, crystallographically characterized mononuclear platinum(III) complex, [Pt(C6Cl5)4]−, has just been reported.

31 citations

Journal ArticleDOI
TL;DR: In this paper, Zinc, cadmium and mercury(II) complexes of creatinine of the composition M(Creat) 2 X 2 (X = Cl, Br or I) are characterized by analytical and spectral methods.

26 citations

Journal ArticleDOI
TL;DR: In this article, the crystal and molecular structure of bis(creatinine)silver(II) perchlorate dihydrate, [Ag(C4H7N3O)2] ClO4·2H2O, was determined from single crystal three-dimensional X-ray data collected by counter methods.

23 citations