Two Heterometallic 4d-4f Coordination Polymers Based on 4-(1H-1,2,4-Triazol-1-yl)benzoic Acid: Syntheses, Structures, and Fluorescence Properties

Two 2D heterometallic 4d-4f coordination polymers, {[EuAg(tbc)(3) (H2O)]ClO4 center dot H2O}(n) (1) and {[Eu2Ag3(tbc)(6)(NO3)(2)(H2O)(2)](ClO4)(2)center dot 2H(2)O}(n) (2) (Htbc=4-(1H-1,2,4-triazol-1-yl) benzoic acid) were synthesized under hydrothermal condition using one-step approach and structurally characterized by elemental analysis, FT-IR, powder X-ray diffraction and single-crystal X-ray diffraction. The single-crystal X-ray diffraction analysis reveals that the two complexes present two different types of two dimensional (2D) structures. Complex 1 crystallized in an orthorhombic manner having a P2(1)2(1)2(1) space group, consisting of 1D triple-stranded helical (PPM) [Eu(mu(3)-OCO)(2)(mu(2)-OCO)] motif as chain which are further linked by the fragments of tbc- ligands and Ag (I). Polymer 2 is crystallized in a triclinic fashion having a P (1) over bar space group, consisting of 1D mesomeric chains [Eu(mu(3)-OCO)(2)] which were further linked by the two different [N-Ag-N] units to form an interesting 2D 4d-4f heterometallic coordination polymer in the ab plane. The solid-state luminescent behaviors of compounds 1 and 2 were investigated at room temperature. CCDC: 1018336, 1; 1024087 2.