Syntheses and structural determination of mononuclear nine-coordinate (MnH)[GdIII(EDTA)(H2O)3] · 4H2O and 2D ladder-like binuclear nine-coordinate (MnH)2[Gd2III (H2TTHA)2] · 4H2O

摘要: Two title rare earth metal coordination compounds, (MnH)[GdIII(Edta)(H2O)3] · 4H2O (I) and (MnH)2[Gd2III(H2Ttha)2] (II), where Mn = methylamine, H4Edta ethylenediamine-N,N,N′,N′-tetraacetic acid, H6Ttha triethylenetetramine-N,N,N′,N″,N′″,N′″-hexaacetic acid), have been successfully synthesized through direct heating reflux characterized by FT-IR spectroscopy, thermal analysis single-crystal X-ray diffraction techniques. In complex I, the Gd3+ ion is nine-coordinated an Edta ligand three water molecules, yielding a pseudo-monocapped square antiprismatic (MC-SAP) conformation. Complex I crystallizes in orthorhombic crystal system with space group Fdd2. The cell dimensions are as follows: 19.5207(17), b 35.387(3), c 12.5118(11) A, V 8642.8(13) A3. central of II also ninecoordinate, forming tricapped trigonal prismatic (TC-TP) conformation amine nitrogen atoms six oxygen atoms. monoclinic P2/c group. data 14.4301(13), 11.2400(11), 17.7102(16) β 112.606(2)°, 2651.8(4) There retain outer-protonated inner-protonated carboxyl [Gd2III(H2Ttha)2]2− anion. II, there only one type methylamine cation (MnH+) counter ion, which connects anions lattice molecules hydrogen bonds, leading to formation 2D ladder-like layer structure.