نتایج جستجو برای: complex cobalt ii
تعداد نتایج: 1332367 فیلتر نتایج به سال:
پنج کمپلکس جدید،از ترکیب لیگاند dpptبا نمک های کلرید، استات و نیترات از فلزات دو ظرفیتی کادمیم، مس، منگنز وکبالت ، تهیه گردیده وبا اسپکتروسکوپی های جرمی، الکترونی، مادون قرمز،آنالیز عنصری و کریستالوگرافی ایکس- ری مورد بررسی قرار گرفته اند.تحقیقات اسپکتروسکوپی برای تمامی این ترکیبات تک هسته ای ،عدد کوئوردیناسیون شش با ساختار هندسی اکتاهدرال را پیشنهاد میدهد.
In the structure of the title compound [systematic name: tetra-aqua-bis-(thio-cyanato-κN)cobalt(II)-1,3,7-trimethyl-1,2,3,6-tetra-hydro-7H-purine-2,6-dione-water (1/2/4)], [Co(NCS)2(H2O)4]·2C8H10N4O2·4H2O, the cobalt(II) cation lies on an inversion centre and is coordinated in a slightly distorted octa-hedral geometry by the oxygen atoms of four water mol-ecules and two N atoms of two trans-arr...
Adenosylcobalamin, the coenzyme form of vitamin B12, is one Nature's most complex coenzyme whose de novo biogenesis proceeds along either an anaerobic or aerobic metabolic pathway. The aerobic synthesis involves reduction of the centrally chelated cobalt metal ion of the corrin ring from Co(II) to Co(I) before adenosylation can take place. A corrin reductase (CobR) enzyme has been identified as...
Preparation of cobalt(II) derivatives of type 1 copper proteins has been extended to include bean plastocyanin and azurin from Pseudomonas aeruginosa. Fluorescence quenching data suggest that Co(II) binds to the type 1 site of both apoplastocyanin and apoazurin. Electronic absorption spectral measurements have been made for cobalt(II)-stellacyanin, cobalt(II)-plastocyanin, and cobalt(II)-azurin...
The syntheses of 2,6-di(pyrid-2-yl)pyrazine (L(1)), 2,6-di(pyrazinyl)pyridine (L(2)), 2,2':6',2''-terpyrazine (L(3)), 2,6-di(pyrimidin-4-yl)pyridine (L(4)), 2,6-di(1,2,4-triazin-3-yl)pyridine (L(5)), 4-hydroxy-2,6-di(pyrazinyl)pyridine (L(6)) and 4-hydroxy-2,6-di(pyrimidin-2-yl)pyridine (L(7)) are described. Homoleptic iron(II) and cobalt(II) complexes of these ligands have been prepared and, i...
In this paper, we used quantum chemical approach to shed light on the catalytic mechanism of γ-carbonic anhydrase (γ-CA) to convert carbon dioxide to bicarbonate ion. Density functional theory (DFT) using B3LYP and UB3LYP functional and three split-valance including 6-31G*, 6-311G** and 6-311++G** basis sets were used to calculate the details of electronic structure and electronic energy of act...
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