Solvothermal Synthesis,Crystal Structure,and Luminescent Properties of Three Heterometallic Lanthanide‐Transition‐Metal Frameworks Constructed from Three Types of CuBr Motifs |
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Authors: | Lu Chen Ying Liu Ding Lou Chengde Wei Yan Xu |
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Institution: | College of Chemistry and Chemical Engineering, State Key Laboratory of Materials‐Oriented Chemical Engineering, Nanjing Tech University, Nanjing, P. R. China |
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Abstract: | Three three‐dimensional (3D) heterometallic lanthanide‐transition‐metal (hetero‐Ln‐TM) compounds with the formula Ln6(Cu4Br3)(Cu2Br2)2(Cu2Br)(IN)20(H2O)12] · 2H2O Ln = Gd ( 1 ), Ln = Sm ( 2 ), Ln = Eu ( 3 )] based on the linkages of one‐dimensional Ln organic chain and CumBrn units were synthesized by mixing Ln2O3 with isonicotinic acid (HIN = pyridine‐4‐carboxylic acid) under hydrothermal condition. During the synthesis, two ligands were used: the isonicotinate (IN–) stabilizes the cluster and links the one‐dimensional Ln organic chains and CumBrn motif, whereas Br– anions play a very important role in the formation of the distinct CumBrn units. It is interesting that there are three different Cu‐Br motifs: a closed four‐membered ring Cu2Br2] subunit, a linear Cu2Br] subunit, an S‐sharp Cu4Br3] subunit. Strong fluorescence of compounds 2 and 3 suggests an efficient energy transfer from the ligand to Eu3+ ions. The luminescent investigation indicates that 2 and 3 are excellent candidates for fluorescent materials. |
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Keywords: | 3d‐4f Heterometallic compound Lanthanides Luminescence CuBr motif |
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