title: Ionothermal synthesis, crystal structure, topology and catalytic properties of heterometallic coordination polymers constructed from N-(phosphonomethyl) iminodiacetic acid.
abstract: Reactions of rare earth chlorides, N-(phosphonomethyl)iminodiacetic acid (H(4)pmida) and ferrous oxalate dihydrate under ionothermal conditions result in four new isostructural 3d-4f heterometal coordination polymers, [LnFe(III)Fe(6)(Hpmida)(6)]·2H(2)O {Ln = Eu (1), Dy (2), Ho (3) and Y (4)}. All compounds were characterized by infrared spectroscopy, elemental analysis, thermogravimetric analysis, and X-ray diffraction. The compounds feature a very interesting three dimensional (3-D) structure built up from a secondary building unit, [Fe(2)(Hpmida)(2)](2-) and possess a new topology type and complicated unique tilings. The catalytic properties of compounds 1-4 were investigated showing that these types of compounds are heterogeneous catalysts in the Knöevenagel condensation with high selectivity.
authors.affiliation: School of Chemistry & Environmental Engineering, Jiangsu University of Technology, Changzhou 23001, P R China. tinghai_yang@hotmail.com fshi96@foxmail.com.
authors.forename: Ting-Hai
authors.initials: TH
authors.lastname: Yang
authors.forename: Ana Rosa
authors.initials: AR
authors.lastname: Silva
authors.forename: Lianshe
authors.initials: L
authors.lastname: Fu
authors.forename: Fa-Nian
authors.initials: FN
authors.lastname: Shi