Four novel metal coordination polymers directed by 1,1′-dibutyl-4,4′-bipyridinium dibromide (BBP) and their framework dependent luminescent properties

Abstract

In our effort to systematically investigate the influence of spacers and terminal groups in structure-directing agent BBP on Ag/I, Pb/I and Cu/SCN inorganic frameworks, four coordination polymers, {[(Ag₂I₆)(BBP)₂]} (1), {[(Pb₆I₂₂)(DMF)₂(BBP)₅]} (2), {[Cu₂(SCN)₄(BBP)]}_n (3) and {[Cu₄(SCN)₆(BBP)]}_n (4) have been synthesized in polar organic solvents. Compound 1 is a dimer of [Ag₂I₆]²⁻; compound 2 is a hexanuclear oligomer of [Pb₆I₂₂]¹⁰⁻; both compound 3 and 4 are infinite Cu(I) supramolecular polymers linked by bridging thiocyanate groups; whereas compound 3 possesses a 1D chain structure, compound 4 exhibits a two-dimensional cubane-based polypseudorotaxane network. All compounds were further characterized with elemental analysis, IR spectra, thermal analysis, and fluorescence properties.