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57384-22-2

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57384-22-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 57384-22-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,3,8 and 4 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 57384-22:
(7*5)+(6*7)+(5*3)+(4*8)+(3*4)+(2*2)+(1*2)=142
142 % 10 = 2
So 57384-22-2 is a valid CAS Registry Number.

57384-22-2Relevant articles and documents

Preparation and Physicochemical Properties of Tervalent Cobalt Complexes of Porphyrins

Sugimoto, Hiroshi,Ueda, Nobuhiro,Mori, Masayasu

, p. 3425 - 3432 (2007/10/02)

Tervalent cobalt complexes of octaethylporphyrin (OEP) and tetraphenylporphyrin (TPP), III(OEP)(H2O)2>X (X=ClO4, BF4), III(OEP)(THF)2>ClO4, III(TPP)(H2O)2>X (X=ClO4, BF4), and III(TPP)(H2O)Y> (Y=Cl, Br, SCN,N3) were synthesized.Molecular weight measurements indicate that only III(TPP)(H2O)2>BF4 and III(TPP)(H2O2>ClO4 aggregate at higher concentrations in chloroform.In polar solvents such as methanol, all are monomeric.In nonpolar solvents, all the complexes show Soret bands at shorter wavelengths and somewhat paramagnetic 1H NMR spectra;these anomalies are absent in polar solvents.Tetrafluoroborates and perchlorates react with ethyl vinyl ether smoothly to form 2,2-diethoxyethylcobalt(III) complexes which are easily converted to formylmethylcobalt(III) complexes. 1H NMR and absorption spectra of the amine adducts prepared in this study, III(OEP)(L)2>ClO4 (L=pyridine, 2-methylimidazole) and III(TPP)(L')2>ClO4 (L'=pyridine, 4-cyanopyridine, 4-methylpyridine), indicate that the two amine molecules coordinate to the central cobalt atom.As regards redox potentials for the Co(III)/Co(II) couple as measured by cyclic voltammetry, the cobalt(III) porphyrins are categorized into three groups: (i) BF4 and ClO4 salts with redox potentials at about 0.7 V; (ii) halides and pseudohalides with those at 0.2-0.3 V; and (iii) bis(amine) adducts with those at -0.3-+0.1 V.In polar solvents, however, the redox potentials of (i) and (ii) are very similar to one another.

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