4,4′-Bipyridine–trans,trans-hexa-2,4-dienedioic acid (1/1)

Abstract

Key indicators: single-crystal X-ray study; T = 173 K; mean (C-C) = 0.002 Å; R factor = 0.040; wR factor = 0.116; data-to-parameter ratio = 14.6.The title cocrystal, C 10 H 8 N 2 ÁC 6 H 6 O 4 , crystallizes with halfmolecules of 4,4 0 -bipyridine and trans,trans-hexa-2,4-dienedioic acid in the asymmetric unit, as each is located about a crystallographic inversion center. The bipyridine molecule is planar from symmetry. In the dicarboxylic acid molecule, the O-C-C-C torsion angle is À13.0 (2) . In the crystal, O-HÁ Á ÁN and C-HÁ Á ÁO hydrogen bonds generate a threedimensional network. Related literature

Supramolecular interactions in the 1:2 co-crystal of 4,4′-bipyridine and 3-chlorothiophene-2-carboxylic acid

“…The asymmetric unit of the title compound (I) consists of a molecule of 3-chlorothiophene-2-carboxylic acid, 3TPC, and a half of a molecule of 4,4 0 -bipyridine, BPY, which is located on a crystallographic inversion center. The internal angle at N1 in BPY is 117.1 (3) and bond lengths [N1-C6= 1.336 (5) Å and N1-C10 = 1.329 (5) Å ] agree with those reported for neutral BPY structures (see for example Jennifer & Muthiah, 2014;Atria et al, 2014;Moon & Park, 2012;Qin, 2011;Najafpour et al, 2008). The two external bond angles at the carbon of the carboxyl group are 123.7 (3) and 112.4 (3) .…”