“…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) .…”