Proton-induced cis-trans conversion of a platinum(II) center coordinated by L-cysteinatocobalt(III) metalloligands.
Proton-induced cis-trans conversion of a platinum(II) center coordinated by L-cysteinatocobalt(III) metalloligands.
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DOI：
10.1021/ic070265f
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发表时间：
2007-03
影响因子：
4.6
通讯作者：
Zentaro Matsumoto;Takashi Aridomi;A. Igashira-Kamiyama;Tatsuya Kawamoto;T. Konno
中科院分区：
文献类型：
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作者：
Zentaro Matsumoto;Takashi Aridomi;A. Igashira-Kamiyama;Tatsuya Kawamoto;T. Konno
LambdaL-[Co（L-cys-N，S）（en）2]+（l-H2 cys = L-半胱氨酸）与[PtCl 4]2-在水溶液中反应，然后加入酸，得到S-桥连的Co Ⅲ 2 Pt Ⅱ三核配合物（[1]4+），该配合物在水溶液中可逆地转化为它的去质子化配合物（[2]2+）。[1]4+仅形成反式异构体，[2]2+以反式和顺式异构体的混合物存在。通过在水中用邻苯二甲酸处理[1]4+或[2]2+，实现了顺式异构体的选择性形成，这提供了独特的CoIII 4PtII 2六核配合物（[3]4+）。配合物[3]4+经盐酸溶液处理后，由顺式完全转变为反式。
Treatment of LambdaL-[Co(L-cys-N,S)(en)2]+ (l-H2cys = L-cysteine) with [PtCl4]2- in water, followed by the addition of acid, gave an S-bridged CoIII2PtII trinuclear complex ([1]4+), which was reversibly converted to its deprotonated complex ([2]2+) in an aqueous solution. While [1]4+ formed only a trans isomer, [2]2+ existed as a mixture of trans and cis isomers. The selective formation of a cis isomer was achieved by treatment of [1]4+ or [2]2+ with phthalic acid in water, which afforded a unique CoIII4PtII2 hexanuclear complex ([3]4+). Complex [3]4+ was reverted back to [1]4+ by treatment with aqueous HCl, accompanied by the complete cis-to-trans conversion.