Synthesis and Molecular Structures of Two 14-bis(3-pyridyl)-23-diazo-13-butadiene-dichloro-Zn(II) Coordination Polymers

摘要

Two novel coordination polymers with 3D metal-organic frameworks (MOFs) have been synthesized by reacting 1,4-bis(3-pyridyl)-2,3-diazo-1,3-butadiene (>L) with zinc dichloride. Both compounds have the same repeating unit consisting of a distorted tetrahedral Zn(II) center coordinated by two chlorides and two pyridyl nitrogen atoms of two bridging bismonodentate >L ligands, however, different structural conformations have been found, one forming a helical chain and the other producing a square-wave chain. The intermolecular C>−H∙∙∙Cl hydrogen bonds in >1 and >2 play important roles in the formation of three-dimensional coordination polymers. Compound >1 crystallized in an orthorhombic space group Pna21 with a = 7.9652(3), b = 21.4716(7), c = 8.2491(3)Å, V = 1410.81(9) Å ³ and Z = 4. Compound >2 crystallized in a monoclinic space group P21 with a = 9.1752(3), b = 14.5976(4), c = 10.3666(3) Å , β = 98.231(2)°, V = 1374.16(7) Å ³ and Z = 4.