Solvents effects on the self-assemblies of 5,5′-bis(3-hydroxyphenyldiazo)-dipyrromethane

Macrocyclic bisazo-dipyrrolmethane crown ether: synthesis, crystal structure and anions recognition

“…The structure of compound 2 is shown in Fig. 1, and in which both N = N bonds adopt E con guration same to previous azopyrrole compounds [29,[34][35]. The N(2)-N(3) and N(6)-N(7) bond distances are 1.225 (9) Å and 1.206 (9) Å, respectively, which are slight shorter than previous results [29,[34][35].…”

“…1, and in which both N = N bonds adopt E con guration same to previous azopyrrole compounds [29,[34][35]. The N(2)-N(3) and N(6)-N(7) bond distances are 1.225 (9) Å and 1.206 (9) Å, respectively, which are slight shorter than previous results [29,[34][35]. In the crystal of compound 2, the two pyrrole NH groups point to the same side of the molecule, and the angle between them is 63.6°.…”

“…Melting points (mp) were recorded on an electrothermal digital melting point apparatus and uncorrected. 5,5'-bis(3-hydroxyphenyldiazo)-dipyrromethane (1) was prepared according to literature procedure [29]. (Ethane-1,2-diylbis(oxy))bis(ethane-2,1-diyl) bis(4-methylbenzenesulfonate) and other reagents were commercial available and used without further puri cation.…”