Synthesis, Crystal Structures, and Spectroscopic Characterization of Two Pairs of Racemic Isomers of [{Co2(aet)2}{Co(aet)3}2]4+ (aet = 2-Aminoethanethiolate): A Novel S-Bridged Tetranuclear Cobalt(III) Complex Formed by Ligand Transfer from Nickel(II) to Cobalt(III)
| Autor: | Yumi Gotoh, Takumi Konno, Ken-ichi Okamoto |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Ligand
Stereochemistry chemistry.chemical_element Ethylenediamine Crystal structure Triclinic crystal system Inorganic Chemistry Metal Nickel Crystallography chemistry.chemical_compound chemistry visual_art visual_art.visual_art_medium Physical and Theoretical Chemistry Cobalt Monoclinic crystal system |
| Zdroj: | Inorganic Chemistry. 36:4992-4997 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/ic970669f |
| Popis: | A novel S-bridged tetracobalt(III) complex, [{Co2(aet)2}{Co(aet)3}2]4+ (1), was prepared by reacting [Ni(aet)2] (aet = 2-aminoethanethiolate) with [CoCl(NH3)5]2+ or [CoCl2(en)2]+ (en = ethylenediamine) in water. 1 formed two pairs of racemic isomers, 1a and 1b, which were separated by fractional crystallization and/or cation-exchange column chromatography. The crystal structures of 1a and 1b were determined by X-ray crystallography. 1a(NO3)4·2H2O, empirical formula C16H52N12O14S8Co4, crystallizes in the triclinic space group P1 with a = 13.585(3) A, b = 15.132(3) A, c = 10.699(2) A, α = 101.46(1)°, β = 104.78(1)°, γ = 95.89(1)°, and Z = 2. 1b(NO3)4·2H2O crystallizes in the monoclinic space group Cc with a = 26.633(6) A, b = 10.204(1) A, c = 15.907(4) A, β = 110.33(1)°, and Z = 4. Each of 1a and 1b contains four cobalt atoms which are linked by one double and two triple sulfur bridges in a boat-type metal array. The two outer cobalt atoms have a fac-Co(N)3(S)3 chromophore, while the two inner cobalt atoms... |
| Databáze: | OpenAIRE |
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