Anion Effects on the Formation of Cross-Linked Argentophilic Interaction. Synthesis and Structural Properties of AgX Bearing Bis(3-pyridyl)dimethylsilane (X<sup>−</sup>= CF<sub>3</sub>SO<sub>3</sub><sup>−</sup>, PF<sub>6</sub><sup>−</sup>, and NO<sub>3</sub><sup>−</sup>)
作者:Byung Il Park、Jung Woon Lee、Young-A Lee、Jongki Hong、Ok-Sang Jung
DOI:10.1246/bcsj.78.1624
日期:2005.9
Anion effects on the formation of a cross-linked Ag–Ag interaction in the molecular construction of a series of AgX complexes with bis(3-pyridyl)dimethylsilane (L) (X− = CF3SO3−, PF6−, and NO3−) have been carried out. The slow diffusion of an organic solution of L into an aqueous solution of AgX afforded [Ag(L)]X or [Ag(X)(L)]. Each L connected two Ag(I) ions (Ag–N = 2.110(5)–2.161(4) Å) to form a wave strand. For CF3SO3− and PF6− anions, each single strand cross-linked the adjacent single strands via an argentophilic interaction (Ag–Ag = 3.0551(7) Å for CF3SO3−, 3.279(1) Å for PF6−) to produce unique 2D sheets. In contrast, for the NO3− anion, the anion acts as a ligand (Ag–O3N = 2.61–2.79 Å) instead of the argentophilic interaction (Ag···Ag = 3.351(1) Å). That is, a small coordinating anion is an obstacle to form the argentophilic interaction, whereas a big noncoordinating anion favors the argentophilic interaction in the present molecular construction. For all complexes, the geometry around the Ag(I) ion is a typical T-shaped arrangement. The thermal stability can be explained in terms of the structural properties, including the argentophilic interaction.
在一系列 AgX 复合物与双(3-吡啶基)二甲基硅烷(L)(X- = CF3SO3-、PF6- 和 NO3-)的分子结构中,研究了阴离子对形成交联银-银相互作用的影响。将 L 的有机溶液缓慢扩散到 AgX 的水溶液中可得到 [Ag(L)]X 或 [Ag(X)(L)]。每个 L 连接两个 Ag(I) 离子(Ag-N = 2.110(5)-2.161(4) Å),形成一个波股。对于 CF3SO3- 和 PF6- 阴离子,每条单链通过亲氩作用(CF3SO3- 的 Ag-Ag = 3.0551(7)埃,PF6- 的 Ag-Ag = 3.279(1)埃)交联相邻的单链,产生独特的二维薄片。相反,对于 NO3- 阴离子,阴离子起配位作用(Ag-O3N = 2.61-2.79 Å),而不是亲氩作用(Ag--Ag = 3.351(1) Å)。也就是说,在目前的分子结构中,小的配位阴离子是形成亲精作用的障碍,而大的非配位阴离子则有利于亲精作用。对于所有配合物来说,围绕 Ag(I)离子的几何形状都是典型的 T 形排列。热稳定性可以从结构特性(包括亲精相互作用)的角度来解释。