Synthesis, structures of four coordination compounds constructed from o-methacrylamidobenzoic acid and their relationship between structure and solid state luminescence

Abstract

Four new coordination compounds, namely, Zn( o -MAABA) 2 (Phen) ( 1 ), [Cd( o -MAABA) 2 · 2H 2 O] 2 ( 2 ), {[Pb 2 Cl 2 ( o -MAABA) 2 (Phen) 4 ]} · 2H 2 O ( 3 · 2H 2 O ), [Pb(NO 3 )( o -MAABA)(Phen)] n ( 4 ), where o -MAABA = o -methacrylamidobenzoic acid and phen=1, 10-phenanthroline, have been synthesized. All compounds were fully confirmed by FT-IR, elemental analysis and TGA analysis. Their structures were determined by single crystal X-ray diffraction, in which compound 1 shows a mononuclear structure, compounds 2 and 3 have binuclear structures and compound 4 shows an infinite chain. In 2 and 4 , the adjacent chains are extended into a 3D supramolecular architecture via π–π interactions. Solid-state room temperature luminescence spectra revealed that emission bands of compound 1 were located at 524 nm ( λ ex =352 nm) and compound 4 at 479 and 584 nm ( λ ex =390 nm) assigned to the excimer formation. The emission at 454 nm ( λ ex =340 nm) of compound 2 was mainly ascribed to the Ligand–Metal Charge Transfer (LMCT). Four coordination compounds constructed by o -methacrylamidobenzoic, phenanthroline and metal ions are reported. The photoluminescent properties is studied, which is affected by the molecular stacking and LMCT.