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Journal ArticleDOI

Crystal and molecular structure of creatininium tetrachlorocuprate(II)

01 Jan 1979-Inorganica Chimica Acta (Elsevier)-Vol. 33, Iss: 30, pp 241-244
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.
About: This article is published in Inorganica Chimica Acta.The article was published on 1979-01-01. It has received 40 citations till now. The article focuses on the topics: Monoclinic crystal system.
Citations
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Journal ArticleDOI
TL;DR: In this paper, new complexes of the formulaetrans-Pd(Creat) 2Cl2Cl2·2H2O (I) andcis-Pt(Creat)-2I2·3H 2O (II) have been prepared and their structures and stabilities studied by X-ray diffraction and thermal analysis.
Abstract: New complexes of the formulaetrans-Pd(Creat)2Cl2·2H2O (I) andcis-Pt(Creat)2I2·3H2O (II) have been prepared and their structures and stabilities studied by X-ray diffraction and thermal analysis. Both compounds have a squareplanar geometry, the two Cl atoms and N1 creatinine atoms are coordinated to Pd intrans configuration, while in compoundII the I atoms and N1 atoms are coordinated incis configuration. In spite of the earlier differences, the TG and DTA curves of the complexes show that their stability is very similar. Since an extended hydrogen bond system is present in the crystals, especially inII, the possible consequences in biological media are discussed briefly.

8 citations

Journal ArticleDOI
TL;DR: In this article, the crystal and molecular structures of bis(2-methylimidazolium) tetrachlorocuprate(II), (HL1)2[CuCl4], were determined.
Abstract: The (HL n )2[CuCl4] complexes (where L n are organic nitrogen-containing bases with n = 1–6) were synthesized. The crystal and molecular structures of bis(2-methylimidazolium) tetrachlorocuprate(II), (HL1)2[CuCl4], were determined. The spectral characteristics of the complexes were measured. The correlations between the degree of distortion of the crystal structure of the tetrachlorocuprate anion and the hydrogen bond parameters and the spectral characteristics of compounds were obtained.

7 citations

Journal ArticleDOI
TL;DR: In this paper, the synthesis and thermal behavior of new Cu(II)-Creatinine complexes are described by the coupled TG-FT-IR technique, and a parallel characterization by solid state IR spectroscopy and mass spectrometry is also reported.

7 citations

Journal ArticleDOI
TL;DR: In this article, the authors reproduce the intensity distribution in the d-d spectra of three planar CuCl2-4 chromophores within the theoretical model described in the preceding paper.
Abstract: The intensity distributions in the ‘d-d’ spectra of three planar CuCl2- 4 chromophores are reproduced quantitatively within the theoretical model described in the preceding paper. Intensity for these species, namely bis(1-methyl-4-oxo-3,3-diphenylhexyldimethylammonium)tetrachlorocopper(II), bis(2-iminol-1-methy-4-imidazolidinium)tetrachlorocopper(II) and bis(N-methylphenylethylammonium)-tetrachlorocopper(II), is deemed to arise dynamically via the bending vibrations. Fair reproduction of experimental absorbances is achieved using the b 2u mode alone, this being known to be the softest vibration in these systems. The roles of spin-orbit coupling and small departures from D 4h symmetry are discussed. Nearly perfect reproduction of experiment is obtained with addition of small contributions from the eu bend. The intensity distribution in the ‘d-d’ spectrum of the pseudo-tetrahedral chromophore, bis(N-benzylpiper-azinium)tetrachlorocopper(II), is reproduced quantitatively within the ‘static’ model described i...

6 citations

Journal ArticleDOI
TL;DR: In this article, the vibrational analysis and a general valence force field are given for the square planar CuCl42− anion of the complex (LH)2CuCl4, where L=2-aminobenzothiazole.

5 citations

References
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TL;DR: In this paper, the x-ray form factors for a bonded hydrogen in the hydrogen molecule have been calculated for a spherical approximation to the bonded atom, and the corresponding complex scattering factors have also been calculated.
Abstract: The x‐ray form factors for a bonded hydrogen in the hydrogen molecule have been calculated for a spherical approximation to the bonded atom. These factors may be better suited for the least‐squares refinement of x‐ray diffraction data from organic molecular crystals than those for the isolated hydrogen atom. It has been shown that within the spherical approximation for the bonded hydrogens in H2, a least‐squares refinement of the atomic positions will result in a bond length (Re value) short of neutron diffraction or spectroscopic values. The spherical atoms are optimally positioned 0.07 A off each proton into the bond. A nonspherical density for the bonded hydrogen atom in the hydrogen molecule has also been defined and the corresponding complex scattering factors have been calculated. The electronic density for the hydrogen molecule in these calculations was based on a modified form of the Kolos—Roothaan wavefunction for H2. Scattering calculations were made tractable by expansion of a plane wave in spheroidal wavefunctions.

2,401 citations

Journal ArticleDOI
TL;DR: The crystal structure of the yellow compound (NH4)2CuCl4 has been determined by x-ray diffraction studies as discussed by the authors, and the compound crystallizes in the orthorhombic space group Cmca with a=15.46 A, b=7.20 A, and c =7.33 A. The structure contains discrete, planar CuCl4= ions with Cu-Cl distances of 2.30 and 2.79 A.
Abstract: The crystal structure of the yellow compound (NH4)2CuCl4 has been determined by x‐ray diffraction studies. The compound crystallizes in the orthorhombic space group Cmca with a=15.46 A, b=7.20 A, and c=7.20 A. The structure contains discrete, planar CuCl4= ions with Cu–Cl distances of 2.30 and 2.33 A. These ions are then bonded together by longer Cu–Cl bonds of 2.79 A to form infinite two‐dimensional sheets. The yellow compounds (CH3NH3)2CuCl4 and (C2H5NH3)2CuCl4 probably have closely related structures.

94 citations