A new bonding mode of tripodal sulfur ligands: synthesis and structure of tetranuclear [Tt^t-BuZn]ClO₄

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• 作者：Seebacher ; Jan ; Vahrenkamp ; Heinrich
• 关键词：Zinc complexes ; Tripodal ligands ; Tetranuclear complex ; Synthesis ; Structure
• 刊名：Journal of Molecular Structure
• 出版年：2003
• 出版时间：August, 2003
• 年：2003
• 卷：656
• 期：1-3
• 页码：177-181
• 全文大小：134 K

文摘

The tripodal sulfur ligand hydrotris(t-butylthioimidazolyl)borate (Tt^t-Bu) forms zinc complexes Tt^t-BuZn-X with very weakly coordinating coligands X, e.g. perchlorate. It was now observed that recrystallization of Tt^t-BuZn–OClO₃ from methanol in the presence of 2-butylmercaptan leads to a new modification of this compound, whose composition was found by X-ray structure determination to be a tetramer containing the cation [Tt^t-BuZn]₄⁴⁺. Each Tt^t-Bu ligand in this tetramer is coordinated via two of its sulfur donors to two neighbouring zinc ions while the third sulfur bridges them. The chair conformation of the resulting Zn₄S₄ ring contrasts with the common and more or less distorted boat conformations of Zn₄S₄ and Zn₄O₄ rings in related complexes.