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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >The synthesis and unexpected solution chemistry of thermochromic carborane-containing osmium half-sandwich complexes
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The synthesis and unexpected solution chemistry of thermochromic carborane-containing osmium half-sandwich complexes

机译:含热变色碳硼烷的half半三明治配合物的合成和意想不到的溶液化学

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摘要

The functionalisation of the 16-electron complex [Os(eta(6)-p-cymene)(1,2-dicarba-closo-dodecarborane-1,2-dithiolato)] (1) with a series of Lewis bases to give the 18-electron complexes of general formula [Os(eta(6)-p-cymene)(1,2-dicarba-closo-dodecarborane-1,2-dithiolato)(L)] (L = pyridine (2), 4-dimethylaminopyridine (3), 4-cyanopyridine (4), 4-methoxypyridine (5), pyrazine (6), pyridazine (7), 4,4'-bipyridine (8) and triphenylphosphine (9)) is reported. All 18-electron complexes are in equilibrium in solution with the 16-electron precursor, and thermochromic properties are observed in some cases (2, 3, 5, 8, and 9). The binding constants and Gibbs free energies of the equilibria are determined using UV-visible titrations and their stabilities investigated. Synthetic routes for forcing the formation of the 18-electron species are proposed, and analytical methods to characterise the equilibria are described.
机译:具有一系列Lewis碱的16电子配合物[Os(eta(6)-p-cymene)(1,2-dicarba-closo-dodecarborane-1,2-dithiolato)](1)的官能化通式[Os(eta(6)-p-cymene)(1,2-dicarba-closo-dodecarborane-1,2-dithiolato)(L)的18电子配合物(L =吡啶(2),4-据报道有二甲基氨基吡啶(3),4-氰基吡啶(4),4-甲氧基吡啶(5),吡嗪(6),哒嗪(7),4,4'-联吡啶(8)和三苯基膦(9)。所有18电子配合物在溶液中均与16电子前体处于平衡状态,在某些情况下(2、3、5、8和9)观察到热致变色性质。平衡的结合常数和吉布斯自由能使用紫外可见滴定法测定,并研究其稳定性。提出了强迫18电子物种形成的合成途径,并描述了表征平衡的分析方法。

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