Heptacopper(II) and dicopper(II)-adenine complexes: synthesis, structural characterization, and magnetic properties

authors	Ferreira, BJML; Brandao, P; Dos Santos, AM; Gai, Z; Cruz, C; Reis, MS; Santos, TM; Felix, V
nationality	International
journal	JOURNAL OF COORDINATION CHEMISTRY
author keywords	Heptacopper(II); Dicopper(II); Copper cluster; Adenine complexes; Magnetic properties
keywords	DINUCLEAR COPPER(II) COMPLEX; ARENE INCLUSION COMPLEXATION; CRYSTAL-STRUCTURE; COORDINATION POLYMERS; BUILDING-BLOCKS; DNA-BINDING; HEPTANUCLEAR; TETRANUCLEAR; CLUSTER; CORE
abstract	The syntheses, crystal structures, and magnetic properties of two new copper(II) complexes with molecular formulas [Cu-7((2)-OH2)(6)((3)-O)(6)(adenine)(6)](NO3)(2)6H(2)O (1) and [Cu-2((2)-H2O)(2)(adenine)(2)(H2O)(4)](NO3)(4)2H(2)O (2) are reported. The heptanuclear compound is composed of a central octahedral CuO6 core sharing edges with six adjacent copper octahedra. In 2, the copper octahedra shares one equatorial edge. In both compounds, these basic copper cluster units are further linked by water bridges and bridging adenine ligands through N3 and N9 donors. All copper(II) centers exhibit Jahn-Teller distorted octahedral coordination characteristic of a d(9) center. The study of the magnetic properties of the heptacopper complex revealed a dominant ferromagnetic intra-cluster interaction, while the dicopper complex exhibits antiferromagnetic intra-dimer interactions with weakly ferromagnetic inter-dimer interaction.
publisher	TAYLOR & FRANCIS LTD
issn	0095-8972
year published	2015
volume	68
issue	16
beginning page	2770
ending page	2787
digital object identifier (doi)	10.1080/00958972.2015.1061126
web of science category	Chemistry, Inorganic & Nuclear
subject category	Chemistry
unique article identifier	WOS:000359822900003