在 ((II) 胺基酸盐复合体中的一个弱而短的金属-金属键
Azwana R Sadique1, Mary Jane Heeg, Charles H Winter
1Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.
新的胺酸复合物被合成和特征. 一个复合物,[Cr(tBuNC(CH3) NEt) ]2,形成一个二聚体,具有弱-键,在溶液中解离.
科学领域:
- 有机金属化学 有机金属化学
- 协调化学 协调化学
- 无机合成 无机合成
背景情况:
- 化学,特别是胺酸联体,是正在进行的研究领域.
- 了解金属对金属的结合和连接物效应对于开发新材料和催化剂至关重要.
研究的目的:
- 合成和表征新型胺酸复合物.
- 研究这些新化合物的结构,电子和结合性质.
- 探索二维复合物的溶液行为和稳定性.
主要方法:
- 用各种胺酸试剂合成 (II) 化物.
- 结晶和X射线衍射用于固态结构的确定.
- 磁感应度测量和NMR光谱 (CP/MAS 13C,1H) 用于电子和结构分析.
- 测量溶液分子量和磁矩,以评估溶液的行为.
主要成果:
- 成功合成了三种新的胺酸复合物:Cr[tBuNC(CH3) NtBu]2,Cr[iPrNC(CH3) NiPr]2和[Cr(tBuNC(CH3) NEt) 2 .
- 对于前两个复合体,观察到具有四面体和正方形平面几何学的单体结构.
- 第三个复合体[Cr(tBuNC(CH3) NEt) ]2,形成一个二极体,具有短的-键 (1.9601(12) Å),并且在固态中具有二磁性.
- 这种二聚体在溶液中解离成偏磁性单聚体,表明-键较弱.
结论:
- 合成的胺酸复合物在固态中表现出多样化的结构动图.
- 二维复合物[Cr(tBuNC(CH3) NEt) ]2具有弱的Cr-Cr键,在溶液中容易分离.
- 溶解能量和金属键强度在二维形式的稳定性中起着重要作用.
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