Syntheses, structures and properties of a series of hetero-nuclear clusters between transition metals and rare-earth metals based on amino acid

Six high-heteronuclear clusters, consisting of transition metals and rare-earth metals, have been prepared via the solvothermal reaction, with the formula [LnNi(6)(LTP)(12)]center dot 3(NO3) (Ln = La center dot 1, Ce center dot 2, Pr center dot 3, Nd center dot 4, Sm center dot 5, Gd center dot 6, LTP = L-thioproline). Complexes 1-6 can be described as hepta-nuclear hetero-clusters. The IR spectra, elemental analyses, thermal analyses, XRD and single-crystal X-ray diffraction of 1-6 have been measured. X-ray single-crystal structural analyses indicate that 1-6 are isomorphic with the triclinic P (1) over bar space group. A twelve-coordinated Ln(3+) ion is located in the center of a distorted octahedron. Each vertex of the octahedron is situated by a six-coordinated Ni2+ ion. LTP plays an important role in linking the Ln(3+) ion and the Ni2+ ion. Furthermore, luminescent properties of the title complexes have been investigated at room temperature, and the results indicate that these complexes may be act as the potential materials applied in the fluorescent field. (C) 2015 Elsevier B.V. All rights reserved.