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Synthesis and characterization of nickel(II) and copper(II) complexes of hexaaza macrocycle, 4-methyl-1,3,5,8,11,14-hexaazatricyclooctadecane |
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| Authors: | S. Sujatha S. Balasubramanian H.-K. Fun K. Chinnakali |
| Affiliation: | aDepartment of Inorganic Chemistry, School of Chemical Sciences, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India bX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia cDepartment of Physics, Anna University, Chennai 600 025, Tamil Nadu, India |
| Abstract: | The Ni(II) and Cu(II) complexes of a new 14-membered hexaazamacrocycle, 4-methyl-1,3,6,8,11,14-hexaazatricyclooctadecane (PCHA) in which a methyl group is attached to the macrocyclic frame work has been synthesized by the one pot reaction of triethylenetetraamine, formaldehyde and 1,2-propanediamine in the presence of metal ion. The complexes have been characterized by spectroscopic, electrochemical and molar conductivity measurements. The Ni(II) complex exists in solution as a mixture of octahedral, high-spin and planar, low-spin species; the thermodynamic parameters for the spin interconversion depend on the cyclic nature of the ligand. The crystal structure of [Ni(PCHA)](ClO4)2 was determined by X-ray crystallography. |
| Keywords: | Macrotricycle Metal complexes X-ray crystal structure Spin interconversion Electrochemistry |
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