Two novel zinc organophosphonates with coordinated 1,10-phenanthroline ligand(Phen) were prepared by hydrothermal reactions and characterized by single crystal X-ray diffraction, IR, and thermogravimetric analysis(TGA). Zn(CH3COO)·2H2O, 1,10-phenanthroline, methylphosphonic or phenylphosphonic acid, 1,4-Bis(3-aminopropyl) piperazine and water were heated in 23-ml capacity Teflon-lined stainless steel Parr autoclave at 160°C for 3 days. Zn2(PO3CH3)2(C12H8N2)·(H2O)(I) crystallizes in the triclinic system (space group P-1(No.2), a=8.410(2)Å, b=10.660(2)Å, c=10.673(2)Å, α=110.251(3)°, β=99.268(3)°, γ=93.050(3)°, V=879.9(3)Å3, Z=2), and has a neutral 1D framework formed of vertex-sharing ZnO4 and ZnO3(Phen) polyhedra linked by PO3CH3 tetrahedra to form chains along the a axis. The ZnO4 tetrahedra share all oxygen atoms with four PO3CH3 tetrahedra while the ZnO3(Phen) has a distorted square pyramidal coordination formed of three oxygen atoms shared with three PO3CH3 and two nitrogen atoms from one 1,10-phenanthroline ligand. The neutral chains are held together via water molecules. The compound Zn(HPO3C6H5)2(H2PO3C6H5)(C12H8N2)2·1.5(H2O)(II) crystallizes in the monoclinic system (space group P2(1)/c (No.14), a=17.901(4)Å, b=13.292(3)Å, c=17.836(4)Å, β=98.040(4)°, V=4202(2)Å3, Z=8). Its network is built of ZnO2(Phen)2 octahedra, that share four nitrogen atoms with two 1,10-phenanthroline ligand and two oxygen atoms from two HPO3C6H5 tetrahedra to form neutral {Zn(HPO3C6H5)2(1,10-phenanthroline)2} units held together through strong hydrogen bonds with additional neutral H2PO3C6H5 tetrahedra. The preparation, crystal structure analysis, and thermal behavior of these two compounds will be presented.
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