A new zinc(II) coordination compound of meta-aminobenzoate and 4,4 '-bipyridine with broad-band photoluminescence emission

摘要

A new coordination compound with a 1-D chain-like structure, [ZnL2(4,4'-bipy)](n) (L = meta-aminobenzoate; 4,4'-bipy = 4,4'-bipyridine), has been hydrothermally prepared and characterized by single-crystal X-ray diffraction analysis, elemental analysis, and photoluminescence determination. The obtained yellow prismatic crystal belongs to triclinic space group P (1) over bar with a = 7.9053(16), b = 11.664(2), c = 12.404(3) angstrom, alpha = 98.25(3), beta = 95.54(3), gamma = 103.08(3)degrees, Z = 2, R-1 = 0.0439 and wR(2) = 0.0757. The 1-D chain contains rarely both mu-N,O-bridging bidentate and non-bridging monodentate coordination modes of L ligands, and they are consolidated by N-H center dot center dot center dot O, N-H center dot center dot center dot N, and C-H center dot center dot center dot pi hydrogen bonds as well as pi center dot center dot center dot pi stacking interactions to yield a 3-D supramolecular network. The title compound exhibits a very broad emissive band (lambda(em,max) = 520 nm) when illuminated by 370 nm light, where the high-energy and lowenergy components are tentatively ascribed to ligand-centered and interligand transition, respectively, on the basis of experimental and theoretical data. This work may shed light on the design and synthesis of white-light-emitting coordination compounds. (C) 2015 Elsevier B.V. All rights reserved.