Rare π5^6Pb Interactions in a Two-dimensional Rare Metal-organic Coordination Polymer with Two Distinct Kinds of Axially Chiral Units

摘要

A new metal-organic coordination polymer [Pb(mfpdc)(CH3OH)]n (1, mfpdc = 2,6-dimethyl-4-(2-furanyl) pyridine-3,5-dicarboxylate) was synthesized and characterized by single-crystal X-ray analyses. The crystal is orthorhombic, space group Pbca, a = 15.6297(18), b = 9.4803(11), c = 18.598(2) A, V= 2755.8(6) A3, Z = 8, Mr= 498.44, Dc= 2.403 Mg/m3, F(000) = 1872, the final R = 0.0275 and wR = 0.0726 (1 〉 2σ(I)). There are interesting polynuclear zigzag (PbOs)n chains in the structure of 1, and there have interesting axially chiral S- and R-unit Pb4L units constructed from prochiral organic ligands through C-H...O bonding. The (R/S)-Pb4L units by sharing Pb centers generate a 2-D coordination network, in which there exist rare n65Pb (3.2610 A) interactions. The solid-state photoluminescent emission of compound 1 appears at 487 nm.