Synthesis and characterization of nickel(II) and copper(II) complexes of hexaaza macrocycle, 4-methyl-1,3,5,8,11,14-hexaazatricyclooctadecane

Autor:	Kandasamy Chinnakali, Sengottuvelan Balasubramanian, Subramaniam Sujatha, H.-K. Fun
Rok vydání:	2008
Předmět:	Ligand chemistry.chemical_element Molar conductivity Crystal structure Copper Inorganic Chemistry Metal Nickel chemistry.chemical_compound Crystallography Octahedron chemistry visual_art Materials Chemistry visual_art.visual_art_medium Physical and Theoretical Chemistry Methyl group
Zdroj:	Polyhedron. 27:1925-1929
ISSN:	0277-5387
DOI:	10.1016/j.poly.2008.02.034
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8aa90d4acb027ae5bf035b576ec08db6 https://doi.org/10.1016/j.poly.2008.02.034 Zobrazit plný text záznamu Full Text from ScienceDirect