Construction of Ag(I)-Ln(III) Heterometallic Coordination Polymers Based on Binuclear Ag2(DSPT)2 (H2DSPT=4'-(2,4-Disulfophenyl)-2,2':6'2-terpyridine) Rings and Ln(III) Dimeric Molecular Building Blocks

Four new 4d-4f heterometallic coordination polymers, namely, {[LnAg(DSPT)(mBDC)(H2O)(2)]center dot H2O}(n) [Ln = Sm, (1); Ln = Er, (2); H2DSPT = 4'-(2,4-disulfophenyl)-2,2':6'2-terpyridine); H(2)mBDC = 1,3-benzenedicarboxylic acid], {[CeAg(DPST)(mBDC)(H2O)(2)]center dot H2O}(n) (3), and {[TbAg3(DPST)(2)(INC)(2)(H2O)]}(n) [HINC = isonicotinic acid, (4)], have been successfully synthesized under hydrothermal conditions and structurally characterized. The four components, including Ln(III) ions, Ag(I) ions, and the two organic ligands, are successfully incorporated into a single framework. They are all heterometallic complexes based on two kinds of molecular building blocks (MBBs), the Ag-2(DSPT)(2) ring (MBB I) and Ln(2)(COO)(2) dimeric unit (MBB II). Complexes 1 and 2 are isostructural and exhibit a 2D network constructed by MBBs I and II, and further linked by Ag center dot center dot center dot pi interactions to a 3D supramolecular framework. Complexes 3 and 4 are 3D frameworks with sqc-21 and sqc-495 topologies by considering MBB I and II as nodes and coordination bonds/Ag center dot center dot center dot O interactions as linkers. Complexes 1-4 represent rare examples of 4d-4f coordination polymers containing two kinds of organic ligands. Moreover, thermal gravimetric analysis and luminescence properties studies of selected complexes were also investigated.