Zhai Lu, Yang Zhu-Xi, Zhang Wen-Wei, Zuo Jing-Lin, Ren Xiao-Ming
State Key Laboratory of Materials-Oriented Chemical Engineering and College of Chemistry and Molecular Engineering , Nanjing Tech University , Nanjing 210009 , P. R. China.
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 P. R. China.
Inorg Chem. 2018 Apr 2;57(7):4171-4180. doi: 10.1021/acs.inorgchem.8b00374. Epub 2018 Mar 22.
Four isomorphic two-dimensional (2D) homo- and heterometallic coordination polymers (CPs), [(Cd Mn)(HEBTC)(DMSO)] with x = 1 (1), 1/3 (2), 0.5 (3), and 2/3 (4) were prepared by conventional one-pot self-assembly approach, using Cd or mixtures of Cd and Mn with 1,1'-ethynebenzene-3,3',5,5'-tetracarboxylic (HEBTC) under solvothermal conditions. The crystal structures of four isomorphic CPs are composed of center-symmetric trinuclear metal clusters building units linked by HEBTC ligands, extending into (3, 6)-connected topological 2D nets. Four CPs are isomorphic to the Mn-CP, [Mn(HEBTC)(DMSO)], we recently reported. The solid-state photoluminescence of 1-4 shows dual emissions at ambient condition, where the emission bands centered at ca. 390 and 562 nm in 1 are assigned to the fluorescence and phosphorescence within HEBTC ligand, respectively; however, the emission bands centered at around 397 and 470 nm in 2-4 are attributed to fluorescence, corresponding to electron transition within HEBTC ligand and MLCT transition between HEBTC ligand and Mn ion. In addition, the origin of isomorphism between 1 and Mn-CP is also discussed.
