Effect of anion on Ag(i)meso-helical chains formed with 4,4′-dipyridyl ketone: solventversusanion bridging and anion effects on the strength of ligand binding

Komal M Patil,Scott A Cameron,Stephen C Moratti,Lyall R Hanton

doi:10.1039/c4ce00155a

Abstract

Related coordination polymers with varying Ag : L ratios produced a series (1 : 1) that was not sensitive to anion and another (1 : 2) that displayed sensitivity to the anion showing a transition from 1D chains to 2D nets.

Highlights

Rigid linear bridging ligands enable the formation of predictable arrays because of their configuration, coordination activity, and relative orientation of the donor groups
Rigid linear linking ligands such as 4,4′-bipyridine and pyrazine have already been extensively studied for designing linear 1–6 were meso-helical one-dimensional (1D) coordination polymers and higher dimensional networks.[3]
The other involved the Ag ions of the chains being di(μ:κ2O,O′)-bridged together by ClO4−. It crystallised in the monoclinic space group P21/c with two crystallographically distinct Ag(I) cations, two complete L ligands, two ClO4− counteranions, three CH3CN molecules and a H2O of crystallisation in the asymmetric unit

Summary

Introduction

Rigid linear bridging ligands enable the formation of predictable arrays because of their configuration, coordination activity, and relative orientation of the donor groups. The slight bend was a consequence of weak interactions between the Ag(I) cation and the O-atoms of adjacent CF3SO3− anions (Fig. 3).[24] The pyridyl rings of L formed a two-bladed chiral propeller at an angle between the rings of 50.37(9)° and generated 1D strands. Adjacent meso-helical chains were formed into antiparallel pairs through a weak π–π interaction [centroid-to-centroid distance 3.803(2) Å; inter-planar dihedral angle 9.80(9)°, minimum interatomic distance 3.615(2) Å; minimum ring slippage between planes 1.664 Å].

Results

Conclusion