Crystal and molecular structure of creatininium tetrachlorocuprate(II)
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.
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TL;DR: In this article, the polarized optical absorption spectra of the 2-D A 2 Cd 1 − x Mn x Cl 4 (x = 0-1; A = CH 3 NH 3 ) crystals doped with Cu 2+ are investigated.
36 citations
TL;DR: A comprehensive context on the achievements and limitations of currently available non-enzymatic electrochemical creatinine biosensors is offered and the underlying factors pertaining to the interplay of modification/fabrication techniques with the sensitivity, selectivity, interferences, and long-term storage stability of the biosensor are addressed.
35 citations
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
TL;DR: The tetrachlorocuprate(II) ion can crystallize in two different structures with the piperazinium dication (pipzH(2), which shows thermo/photochromism, changing from green to yellow upon heating or laser irradiation.
Abstract: The tetrachlorocuprate(II) ion can crystallize in two different structures with the piperazinium dication (pipzH(2)). Both structures contain discrete CuCl42- species. A yellow compound (pipzH(2))[CuCl4]. 2H(2)O (1) is monoclinic (C2/c, Z = 4, a = 10.538(3) Angstrom, b = 7.4312(5) Angstrom, c = 17.281(4) Angstrom, beta = 111.900(10)degrees) and contains the CuCl42- ion as a distorted tetrahedron. A green compound (pipzH(2))(2)[CuCl4]. Cl-2. 3H(2)O (2) is triclinic (P (1) over bar, Z = 2, a = 9.264(3) Angstrom, b = 10.447(2) Angstrom, c = 11.366(2) Angstrom, alpha = 68.38 degrees, beta = 82.86(2)degrees, gamma = 83.05(2)degrees) and contains the CuCl42- ion with a square planar geometry. This latter compound shows thermo/photochromism, changing from green to yellow upon heating or laser irradiation.
29 citations
TL;DR: Various practical applications of the average (A) and difference (D) of Friedel opposites are described and techniques based on the resonant-scattering contribution to Friedel differences are applied to see whether a crystal is centrosymmetric or not, and to determine the point group of the crystal.
Abstract: Various practical applications of the average (A) and difference (D) of Friedel opposites are described. Techniques based on the resonant-scattering contribution to Friedel differences are applied to see whether a crystal is centrosymmetric or not, and to determine the point group of the crystal. For the validation of a structural study, plots of Aobs against Amodel, and Dobs against Dmodel are used extensively. Moreover, it is useful to display both plots on the same graph. Intensity measurements on a crystal of NaClO3 were made at three different speeds, with two different radiations and two different diffractometers, and treated with two different software packages and four different absorption corrections. The evaluation of these numerous data sets reveals underlying deficiencies. For comparison, plots of Aobs against Amodel, and Dobs against Dmodel are presented for two centrosymmetric crystals.
27 citations
Cites methods from "Crystal and molecular structure of ..."
...Measurements were made on the Swiss– Norwegian Beamline (BM01A) at the European Synchrotron Radiation Facility in Grenoble, France, on the compound 1-methyl-4-oxotetrahydro-2H-imidazol-2-iminium tetrachlorocopper(II) (Udupa & Krebs, 1979) [Cambridge Struc- Acta Cryst....
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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.
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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.
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