Assembly of one 2D layer and two 3D pillared-layer structures derived from metal ions and 5-(pyridin-4-yl)isophthalic acid with or without pillars

摘要

Three new coordination polymers, [Mn(L)(H2O)2]2·5H2O (1), [Cu(L)(4,4'-bipy)]2·H2O (2) and {Pb(L)(4,4'-bipy)_(0.5)] (3) (H2L = 5-(pyridin-4-yl)isophthalic acid; 4,4'-bipy = 4,4'-bipyridine) have been synthesized and characterized by 1R, thermogravimetric analysis, X-ray powder diffraction and X-ray single crystal diffraction. Complex 1 shows a 2D layer structure which stacks with the other ones to form 1D channels to hold 1D water chains. Complex 2 displays a 3D + 3D→ 3D polycatenation network. 3 shows a unique 2D + 2D → 3D polycatenation net in which each Pb center has a hemidirected coordination geometry due to the existence of "inert pair effect". The thermal and luminescent properties of 1-3 were also examined,