“…A search in the Cambridge Structural Database (Version 5.38; Groom et al, 2016) returned 45 entries for azopyrrole derivatives, including three entries for N-vinylphenylazopyrrole (Trofimov et al, 2006;Rusakov et al, 2007), four entries for mono-or bisazopyrroles (Li et al, 2009), two entries for azo calix[4]pyrroles (Nishiyabu et al, 2006), five entries for pyrrole-azocrown ethers (Wagner-Wysiecka et al, 2011;Szczygelska-Tao et al, 2008), two entries for azopyrrole boron difluoride complexes (Li et al, 2009;Lee et al, 2012), ten entries for metal complexes (Li et al, 2008;Li, & Dolphin, 2011;Yin et al, 2012;Zhang et al, 2015;Ghorui et al, 2016 Table 1 Hydrogen-bond geometry (Å , ).…”