A hydrogen bonded cocrystal with an unusual interweaving between the adjacent triple-helices

Abstract

The structure of a cocrystal between trimethoprim and 2-aminoterephthalic acid has revealed the formation of 3D-interpenetrated networks. Each network is composed of tubular columns, sharing walls. Within each column the molecules interact with each other to form either left or right handed triple-helical arrangements with channels of 8.8 × 7.4 Ų dimensions running along the axis of the triple helix. Adjacent strands of each triple helix are separated by a distance of 6.7 Å with the accompanying void space filled by interweaving of triple helices from an adjacent network. The helices of adjacent triple-helical network are connected by N–H⋯O hydrogen bonds and helices of different networks interact with each other by C–H⋯N hydrogen bonds.