Syntheses, structures, and steady state and time resolved photophysical properties of a tetraiminodiphenol macrocyclic ligand and its dinuclear zinc(II)/cadmium(II) complexes with coordinating and noncoordinating anions.

The work in the present investigation reports the syntheses, structures, steady state, and time-resolved photophysical properties of a tetraiminodiphenol macrocyclic ligand H2L and its eight dinuclear zinc(II) complexes and one cadmium(II) complex having composition [Zn2L(H2O)2](ClO4)2·2CH3CN (1), [Zn2L(H2O)2](ClO4)2·2dmf (2), [Zn2L(H2O)2](NO3)2·2dmf (3), [Zn2LCl2] (4), [Zn2L(N3)2] (5), [Zn2L(NCS)2] (6), [Zn2L(NCO)2] (7), [Zn2L(NCSe)2]2·dmf (8), and [Cd2L(OAc)2] (9) with various coordinating and noncoordinating anions. The structures of all the complexes 1–9 have been determined by single-crystal X-ray diffraction. The noncovalent interactions in the complexes result in the generation of the following topologies: two-dimensional network in 1, 2, 4, 6, 7, 8, and 9; three-dimensional network in 5. Spectrophotometric and spectrofluorometric titrations of the diprotonated salt [H4L](ClO4)2 with triethylamine as well as with zinc(II) acetate and cadmium(II) acetate have been carried out, revealing fluorescence...