Anion Control of the Self-Assembly of 2,3-Diarylpyrazines with Silver(I) Salts

Abstract

The synthesis and characterization of three one-dimensional coordination polymers formed on self-assembly of 2,3-diarylpyrazines with silver(I) salts are presented. A linear double-stranded coordination polymer was formed on self-assembly of 2,3-bis(3'5'-dimethylphenyl)pyrazine with silver(I) tetrafluoroborate. An essentially linear double-strand coordination polymer was formed on self-assembly of 2,3-bis(3'5'-dimethylphenyl)pyrazine with silver(I) trifluoromethanesulfonate. In contrast a helical silver-pyrazine coordination polymer with extensive intrastrand pi-stacking was formed on self-assembly of 2,3-diphenylpyrazine with silver(I) trifluoroacetate.

High‐Level Ab Initio Study of Anion–π Interactions in Pyridine and Pyrazine Rings Coordinated to AgI

“…We have extended the search to pyrimidine and pyridazine rings and we have found four and seven structures, respectively, where anion-p interactions are present. In Figure 4 we show two examples of crystal structures retrieved from the CSD (codes IMUYEU [8d] and EQOYIS [20] ) in which the anion-p interaction is evident and play a prominent role in the crystal packing. Further experimental evidence can be extracted from the recent and elegant work of Hanton and coworkers [9,21] who performed an encapsulation of anions by a uniform mode of anion-p binding in isomorphous (4,4) nets formed from Ag I salts and bis(4-pyrimidylmethyl)sulfide.…”

Coordination Networks with Carborane Anions: Ag(I) and Nitrogen Bridging Ligands

“…A twisted chain was anticipated due to the ligand containing four nitrogen atoms, in contrast to the similar 2,3-diphenylpyrazine ligand which forms linear strands with silver. [22] In the extended structure, the chains are separated by snaking chains of cobalticarborane anions. The chains of anions have anions in one of two orientations and show dihydrogen bonding interactions between them with closest B-H· · ·H-C distances of 1.947 and 2.312 Å.…”

Copper and cadmium coordination polymers of di-3-pyridinylmethanone: Subtle anion effect on the dimensionality of Cd(II) frameworks

“…In the design of coordination polymers with diverse dimensionalities [1][2][3][4][5], the counter anion has been shown to play a dominant role [6][7][8][9][10][11][12]. Under normal circumstances, coordination compounds constructed from metal tetrafluoroborates and perchlorates are similar in structure because these two tetrahedral monoanions have only minor differences in their coordinating capability [13,14].…”