Two novel mono- and heptanuclear Ni(II) complexes constructed from new unsymmetric and symmetric Salamo-type bisoximes – Synthetic, structural and spectral studies.

Two novel mono- and heptanuclear Ni(II) complexes, [Ni(HL 1 ) 2 (EtOH) 2 ]·2EtOH ( 1 ) and [Ni 7 (L 2 ) 3 ( μ 3 -OMe) 2 ( μ 3 -OH) 6 (MeOH) 6 ] ( 2 ), have been synthesized by the reaction of Ni(II) acetate with H 2 L 1 and H 2 L 2 , respectively. In the Ni(II) complex 1 , the ligand H 2 L 1 was partially deprotonated, only NO donor atoms of one salicylidene moiety of the (HL 1 ) − unit coordinate to Ni(II) atom. While all the three H 2 L 2 ligands in the Ni(II) complex 2 were completely deprotonated. The seven Ni(II) atoms are all hexa-coordinated, and have two coordination environments. The fluorescence properties of the ligands, the Ni(II) complexes 1 and 2 have been discussed. [ABSTRACT FROM AUTHOR]