Guest inclusion by Borromean weave coordination networks

Abstract

Reaction of N,Nʺ -ethylene-1,2-diylbis(3-pyridin-3-ylurea) (L) with AgNO 3 in a variety of solvents gives a total of five 2-D Borromean weave coordination polymer networks that adopt three structural types depending on the interactions to the solvent pocket. The Borromean network is of formula [Ag 2 (L) 3 ](NO 3 ) 2 Ásolvent where the solvent is either a cluster of water molecules, mixtures of water and acetonitrile, water and methanol or chloroform and methanol. The Borromean structure is a thermodynamic sink and under fast crystallization conditions an alternative 2 þ 2 metallomacrocycle forms that can result in metallogel formation. The metallogel structure transforms into the crystalline Borromean network over time.