Argentophilic interaction and anionic control of supramolecular structures in simple silver pyridine complexes

Chih Yuen Chen, Jing Yao Zeng, Hon Man Lee

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Abstract

The synthesis and characterization of three simple 1:2 silver(I) pyridine adducts of different counter-anions, [Ag(py)2]+ · X- (X = ClO4, 1; BF4, 2; PF6, 3), are reported. The structural studies for 1-3 reveal the presence of strong ligand-unsupported argentophilic interactions between [Ag(py)2]+ ions, forming pairs of [Ag (py)2]22 +. The Ag⋯Ag contact distances are 2.96-3.00 Å. In 1 and 2, pairs of [Ag (py)2]22 + are further linked into 1-D infinite chains by a combined set of multiple Ag⋯Ag close contacts (3.34-3.37 Å), offset 'head to head' π-π stacking, and anion bridging interactions. Such combined set of interactions is anion-dependant with 1 and 2 containing anions of tetrahedral geometry ClO4- and BF4-, affording essentially the same supramolecular architecture. Metal-anion interactions are crucial in organizing the 1-D chains into 3-D networks. The ES-MS studies of 1 and 2 provide positive evidence for the aggregation of silver(I) ions in solution. In contrast, for 3 with the counter-anion of octahedral PF6-, pairs of [Ag (py)2]22 + are organized into a 3-D network via a combined set of Ag⋯F contacts, C(H)⋯F hydrogen bonds, and 'head to tail' π-π stacking interactions. No extended 1-D polymeric chains of silver ions are present in 3.

Original languageEnglish
Pages (from-to)21-30
Number of pages10
JournalInorganica Chimica Acta
Volume360
Issue number1
DOIs
Publication statusPublished - 2007 Jan 1

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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