title: [NaCu(II)4] cluster from alkali template assembly of two asymmetric end-on azido-bridged [Cu(II)2] units.
abstract: The cluster [NaCu4L2(N3)2](ClO4) [1; H3L is 2-(2'-hydroxyphenyl)-1,3-bis[3'-aza-4'-(2''-hydroxyphenyl)prop-4'-en-1'-yl]-1,3-imidazolidine] has been synthesized and structurally characterized. Complex 1 is formed by the template assembly of two [Cu2L(N3)] neutral fragments through their weak oxophilic interactions with a central Na+ cation as observed in metallacrowns. The cluster exhibits a combination of ferro- and antiferromagnetic interactions. End-on N3- bridging of copper ions within the [Cu(II)2] units facilitates stabilization of S = 1 magnetic subunits that mutually cancel via antiferromagnetic coupling as mediated by the O...Na+...O bridges.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India.
authors.forename: Prasant Kumar
authors.initials: PK
authors.lastname: Nanda
authors.forename: Guillem
authors.initials: G
authors.lastname: Aromí
authors.forename: Debashis
authors.initials: D
authors.lastname: Ray