Jump to main content
Jump to site search

Issue 21, 2000
Previous Article Next Article

Multi-modal bridging ligands; effects of ligand functionality, anion and crystallisation solvent in silver(I) co-ordination polymers

Author affiliations

Abstract

The influence of solvent and anion on the formation of co-ordination polymers of silver(I) and the multi-modal ligands 2,2′-bipyrazine (bpyz) and pyrazino[2,3- f ]quinoxaline (pyq) has been studied. Reaction of AgX (X = BF4 or PF6) with bpyz or pyq in MeNO2 affords three-dimensional co-ordination networks, {[Ag(bpyz)]X} or {[Ag(pyq)]X}. Whereas {[Ag(bpyz)]X} form diamond-like networks, which adopt a chiral structure due to the different bridging modes of the bpyz ligand, {[Ag(pyq)]X} form unusual achiral three-dimensional frameworks which are constructed from bridged [Ag(pyq)] tubes. In the case of {[Ag(bpyz)]X} an increase in anion volume from BF4 to PF6 leads to a corresponding increase in helix volume and concomitant contraction of the helical pitch of the diamondoid framework. The use of co-ordinating solvents of crystallisation in the reactions of AgBF4 with bpyz results in the formation of an undulating two-dimensional sheet, {[Ag(bpyz)(MeCN)]BF4}, when MeCN replaces MeNO2, or a one-dimensional polymer {[Ag2(bpyz)2(PhCN)][BF4]2}, when PhCN is used. Reaction of AgBF4 with pyq in either MeCN or PhCN affords the discrete molecular complex [Ag(pyq)2]BF4 in which only the chelating donors of the pyq ligand are co-ordinated to the silver(I) ion. [Ag(pyq)2]BF4 exhibits dimorphism with the two structures observed differing in the nature of their π–π interactions.

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Apr 2000, accepted on 06 Jun 2000 and first published on 10 Oct 2000


Article type: Paper
DOI: 10.1039/B003202F
Citation: J. Chem. Soc., Dalton Trans., 2000,0, 3811-3819
  •   Request permissions

    Multi-modal bridging ligands; effects of ligand functionality, anion and crystallisation solvent in silver(I) co-ordination polymers

    A. J. Blake, N. R. Champness, P. A. Cooke, J. E. B. Nicolson and C. Wilson, J. Chem. Soc., Dalton Trans., 2000, 0, 3811
    DOI: 10.1039/B003202F

Search articles by author

Spotlight

Advertisements