Synthesis and structure of new low dimensional polymeric haloplumbate(II) complexes [Pb 4 Br 12 (C 40 H 40 N 8 )] and [Pb 4 Cl 12 (C 40 H 40 N 8 )]·H 2 O

Abstract

New low dimensional polymeric haloplumbate(II) complexes of the dication of (4,4′-bis(imidazolyl-ylmethyl)biphenyl) were synthesised and their crystal structures determined. Complex 1, [Pb₄Br₁₂(C₄₀H₄₀N₈)], has cis-edge-shared, octahedral, lead bromide double chains. In compound 2 [Pb₄Cl₁₂(C₄₀H₄₀N₈)].H₂O, the inorganic chains are corner-shared, square pyramidal chains of lead chloride. In both compounds the organic ammoniums form regular layers that alternate with the inorganic chains. Strong hydrogen bonds of Pb–X··HN form between the organic and inorganic components in these complexes, which are always considered as an important interaction in supramolecular syntheses. The optical properties of compound 1 and compound 2 yielded photoluminescence spectra, which are attributed to the π–π* transitions of the organic ligand.