Crystal structure, ir-spectrum and electrochemical behaviour of cu(creatinine)2cl2
TL;DR: In this paper, the crystal structure of the little compound has been solved by single-crystal X-ray diffractometry, where the CuII ion is located on a two-fold crystallographic axis in a quasi-tetrahedral coordination.
About: This article is published in Polyhedron.The article was published on 1997-01-01. It has received 23 citations till now. The article focuses on the topics: Cyclic voltammetry & Infrared spectroscopy.
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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
TL;DR: In this article, an electrochemical impedimetric sensor based on molecular imprinted polymer (MIP) was developed for the detection of creatinine, which is a biomolecular recognition element.
Abstract: An electrochemical impedimetric sensor based on molecular imprinted polymer (MIP) has been developed for the detection of creatinine. Creatinine MIP was prepared by using the functional monomer methylacrylate and cross-linker ethylene glycol dimethacrylate in presence of the template creatinine. The resultant polymer was washed with water, methanol and 1 M HCl to extract the template from the polymer matrix. Formations of MIP, NIP (non-imprinted polymer) and template extraction were confirmed with vibrational Raman spectroscopic analysis. MIP incorporated carbon paste electrodes were used to develop a sensor for creatinine by applying electrochemical impedance spectroscopy (EIS) as transduction principle. Charge-transfer impedance ( R ct ) of the sensor system was determined in the absence and presence of creatinine. Interestingly, magnitude of R ct was found to increase with increasing concentrations of creatinine, which suggests the accumulation of creatinine into the polymer matrix. From the calibration plot, the low-detection-limit value was found to be ~20 ng mL −1 . The MIP electrode showed very good selectivity towards the specific recognition of creatinine in the presence of possible interferents like l -ascorbic acid and l -tryptophan. From the observations, we can conclude that the prepared imprinted polymer works successfully as an artificial biomolecular recognition element.
53 citations
TL;DR: The nature of the peptide seems to be a very important factor for the reactivity of copper(II) peptide complexes with bioligands as mentioned in this paper, and only four new ternary Cu(II)-complexes have been obtained.
40 citations
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
01 Apr 2010
TL;DR: In this article, the optimized structure of creatinine was obtained using DFT/B3LYP method with 6-311+G(d,p) and LANL2DZ basis sets.
Abstract: Article history: Creatinine (2-amino-1-methyl-5H-imidazol-4-one) is an amino acid that occurs in vertebrate tissues and in urine. The mid and far infrared spectra of creatinine were recorded in the solid phase. The optimized structure of creatinine was obtained using DFT/B3LYP method with 6-311+G(d,p) and LANL2DZ basis sets. The harmonic frequencies of creatinine were calculated using DFT/B3LYP/6-311+G(d,p) method. The complete assignments were performed on the basis of the total energy distribution (TED) of the vibrational modes, calculated with scaled quantum mechanics (SQM) method. The creatinine-metal {cadmium (Cd(II)), zinc (Zn(II)) and mercury (Hg(II))} halogen (chloride (Cl - ) and bromide (Br - )) complexes were synthesized. DFT calculations, DFT-B3LYP/LANL2DZ were performed for the determination of geometrical structure and vibrational assignment for metal- complexes.
19 citations
Cites background or methods or result from "Crystal structure, ir-spectrum and ..."
...These results suggested that the NH2 groups of creatinine are not involved in the coordination with the metal ions and are in good agreement with those reported in the literature [11,12]....
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...[12] as the fundamental due to the wagging modes of the amino group....
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...109 structure of Cu(creat)2Cl2 [12] was used as the initial guess for optimization....
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...The bands observed at 841 and 813 cm-1 are assigned by Costa et al. [12] as the fundamental due to the wagging modes of the amino group....
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...The optimized geometry parameters for the creatinine complexes with Cu (II), Zn (II) and Cd (II) are in good agreement with the X-ray crystallographic data [12,28,29]....
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36 citations
TL;DR: The electrochemical behavior, investigated by cyclic voltammetry, shows that the complex possesses a very high redox stability and the possible SOD-like activity was tested using the NBT/superoxide reduction assay, showing a negligible SOD activity.
31 citations
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.
26 citations
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
TL;DR: In this paper, the electronic spectra and magnetic moments suggest a d7 configuration for cobalt: a tetrahedral geometry (4.4 B.M.) for halide and thiocyanate complexes, and an octahedral geometry for the carboxylate complexes.
Abstract: Cobalt(II) complexes of creatinine [Co(creat)2X2] (X = Cl, Br, I or NCS) and [Co(creat)2X2(H2O)2] (X = HCO2, HOCH2CO2 or CNCH2CO2) have been prepared. Their i.r. spectra show an increase in ν(NH) of the cyclic secondary amine group, compared to free ligand (3300 cm−1), indicating that cyclic nitrogen is involved in coordination. The thiocyanate group coordinates through nitrogen and carboxylates coordinate as univalent unidentate ligands. The electronic spectra and magnetic moments suggest a d7 configuration for cobalt: a tetrahedral geometry (4.4 B.M.) for halide and thiocyanate complexes, and an octahedral geometry (5.0 B.M.) for the carboxylate complexes. On heating, the ligand moiety is lost and the respective cobalt halide or cobalt carboxylate is formed, which is converted finally into Co3O4. There is a correlation between the high intensity electronic transitions and the polarographic half-wave potentials.
18 citations