Synthesis, structures of four coordination compounds constructed from o-methacrylamidobenzoic acid and their relationship between structure and solid state luminescence
Four new coordination compounds, namely, Zn(o-MAABA){sub 2}(Phen) (1), [Cd(o-MAABA){sub 2}·2H{sub 2}O]{sub 2} (2), ([Pb{sub 2}Cl{sub 2}(o-MAABA){sub 2}(Phen){sub 4}])·2H{sub 2}O (3·2H{sub 2}O), [Pb(NO{sub 3})(o-MAABA)(Phen)]{sub 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{sub ex}=352 nm) and compound 4 at 479 and 584 nm (λ{sub ex}=390 nm) assigned to the excimer formation. The emission at 454 nm (λ{sub ex}=340 nm) of compound 2 was mainly ascribed to the Ligand–Metal Charge Transfer (LMCT). - Graphical abstract: 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.