Coordination properties of the bioligands creatinine and creatine in various reaction media
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.
About: This article is published in Coordination Chemistry Reviews.The article was published on 1995-03-01. It has received 34 citations till now.
Citations
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TL;DR: Guanidines have attracted increasing attention as electronically and sterically flexible ligands as mentioned in this paper, exhibiting a variety of coordination modes and a range of donor properties leading to compatibility with a remarkably wide range of metal ions from all parts of the periodic table.
476 citations
TL;DR: A disposable nonenzymatic sensor for creatinine was developed by electrodepositing copper on screen printed carbon electrodes as mentioned in this paper, which showed a detection limit of 0.0746μM with a linear range of 6-378μΜ.
Abstract: A disposable non-enzymatic sensor for creatinine was developed by electrodepositing copper on screen printed carbon electrodes. The sensor was characterized using electrochemical and microscopic techniques. Electrochemical detection of creatinine was carried out in phosphate buffer solution of pH 7.4. The estimation was based on the formation of soluble copper-creatinine complex. The formation of copper-creatinine complex was established using the pseudoperoxidase activity of copper-creatinine complex. The sensor showed a detection limit of 0.0746 μM with a linear range of 6–378 μΜ. The sensor exhibited a stable response to creatinine and found to be free from interference from molecules like urea, glucose, ascorbic acid and dopamine. Real sample analysis was carried out with blood serum.
75 citations
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: The simple fabrication process, low cost, and clinically appropriate creatinine sensitivity make this device applicable for point-of-care use.
54 citations
TL;DR: The results of these studies and calculations using density functional theory are consistent with the oxidation being metal-based, resulting in an uncommon Pd(2)(5+) species with a Pd-Pd bond order of 1/2.
Abstract: Reaction of Pd2(DAniF)4, 1, (DAniF = di-p-anisylformamidinate) with 1 equiv of AgPF6 in CH2Cl2 at or below −10 °C produces the paramagnetic species [Pd2(DAniF)4]PF6, 1-PF6, that has been studied by X-ray crystallography, UV−vis spectroscopy, electrochemistry, and multifrequency (9.5, 34.5, 110, and 220 GHz) EPR spectroscopy. Upon oxidation of the precursor, the Pd−Pd distance decreases by 0.052 A from 2.6486(8) to 2.597(1) A. The EPR spectra show broad signals with line widths of about 1000 G. The spectra collected at high field show a large spread of g tensor components (∼0.03), but these are masked at lower frequencies (9.5 and 34.5 GHz). A reinvestigation using high-field EPR of the p-tolyl analogue, which is the only other structurally characterized Pd25+ species (Cotton, F. A.; Matusz, M.; Poli, R.; Feng, X. J. Am. Chem. Soc. 1988, 110, 1144), shows that this species, which had been reported to give an isotropic 9.5 GHz EPR spectrum, also gives anisotropic 110 and 220 GHz EPR spectra with a similarly...
44 citations
References
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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
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 article, the complex formation between creatinine and Cu(II) was studied by means of electronic, IR and EPR spectroscopy, and spectral data showed the formation of a four-membered chelate with distorted rhombic structure.
19 citations
TL;DR: In this paper, a slow redox process is described for a green monomeric system with a marked decrease of plI and I s s e n s i t i v e t i c and i s s i c e a c i d i t o t h e a C i d I t y, t o T h e n a t u r e r e of t H e s o l v e n t (1120, D,O or organic S o l V E n t ) and the presence of O2 as wel l
Abstract: A b s t r a c t The i n t e r a c t i o n of P t ( I 1 ) with c r e a t i n i n e i s s t u d i e d i n d i f f e r e n t r e a c t i o n c o n d i t i o n s . A t L:M r a t i o from 4 t o 10 s e v e r a l new complexes of P t ( I 1 ) a r e o b t a i n e d , s t u d i e d by s p e c t r o s c o p i c methods and X-ray d i f f r a c t i o n . I n these monomer i c s p e c i e s the l i g a n d i s coord ina ted only through the endogenic n i t r o g e n . A t L:M = 1 a slow redox process t a k e s p l a c e leat i ing t o the format ion of s e v e r a l ( n e u t r a l , a n i o n i c and cat i o n i c ) b l u e t o green paramacne t i c s p e c i e s . The process proceeds on with a marked decrease of plI and i s s e n s i t i v e t o t h e a c i d i t y , t o t h e n a t u r e of t h e s o l v e n t (1120, D,O or organic s o l v e n t ) and t o t h e presence of O2 as wel l . A-green monomeric s p e c i e s was i s o l a t e d and s t u d i e d by X-ray s t r u c t u r a l a n a l y s i s .
18 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