title: Synthesis, magnetism and spectral studies of six defective dicubane tetranuclear {M4O6} (M = Ni(II), Co(II), Zn(II)) and three trinuclear Cd(II) complexes with polydentate Schiff base ligands.
abstract: A series of Ni(II), Co(II), Zn(II) and Cd(II) complexes with polytopic Schiff base ligands have been synthesized. The single-crystal X-ray crystallography results show that tetranuclear complexes have common face-shared defective dicubane cores, whereas trinuclear Cd(II) complexes are almost linear entities. Synthesis methods (solvent evaporation and hydrothermal synthesis), reaction conditions (pH, solvents and dosage) and coligands (azide, methanol, chloride and acetate) play vital roles in determining the final structure of the complexes and therefore their magnetic properties. In complexes , the terminal and central M(2+) ions are connected through mixed bridges, μ-phenoxido/μ1,1,1-X and μ-Oalphatic/μ1,1,1-X, while central two M(2+) ions are linked by double bridges, μ1,1,1-X (X = azido and methoxido groups for and respectively). For complex , two central Ni(II) ions are connected through two μ1,1,1-N3(-) which is relatively less reported. For complexes , there are two kinds of Cd(II), the centre Cd(II) ions are eight-coordinated with triangle dodecahedral geometries, while the two side Cd(II) ions are six-coordinated with trigonal prism geometries using chlorides or acetates as terminal ligands. Magnetic susceptibility measurements (χM) for compounds have been performed, and they reveal predominant ferromagnetic exchange interactions in Co(II) and Ni(II) tetramers. The photoluminescence studies show that the Zn(II) complex and three Cd(II) complexes have strong fluorescence, and the lifetimes are measured to be in the 10(2) nanosecond timescale.
authors.affiliation: College of Chemistry, Nankai University, Tianjin 300071, China. tiant@nankai.edu.cn liuxin64@nankai.edu.cn and Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin 300071, China and Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Tianjin 300071, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Jiang
authors.affiliation: College of Chemistry, Nankai University, Tianjin 300071, China. tiant@nankai.edu.cn liuxin64@nankai.edu.cn and Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin 300071, China and Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Tianjin 300071, China.
authors.forename: Dong-Yan
authors.initials: DY
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Nankai University, Tianjin 300071, China. tiant@nankai.edu.cn liuxin64@nankai.edu.cn and Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin 300071, China and Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Tianjin 300071, China.
authors.forename: Jing-Jing
authors.initials: JJ
authors.lastname: Suo
authors.affiliation: College of Chemistry, Nankai University, Tianjin 300071, China. tiant@nankai.edu.cn liuxin64@nankai.edu.cn and Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin 300071, China and Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Tianjin 300071, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Gu
authors.affiliation: College of Chemistry, Nankai University, Tianjin 300071, China. tiant@nankai.edu.cn liuxin64@nankai.edu.cn and Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin 300071, China and Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Tianjin 300071, China.
authors.forename: Jin-Lei
authors.initials: JL
authors.lastname: Tian
authors.affiliation: College of Chemistry, Nankai University, Tianjin 300071, China. tiant@nankai.edu.cn liuxin64@nankai.edu.cn and Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin 300071, China and Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Tianjin 300071, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.affiliation: College of Chemistry, Nankai University, Tianjin 300071, China. tiant@nankai.edu.cn liuxin64@nankai.edu.cn and Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin 300071, China and Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Tianjin 300071, China.
authors.forename: Shi-Ping
authors.initials: SP
authors.lastname: Yan