title: One pot synthesis of heterometallic 3d-3d azido architectures: assembling strategy and magnetic properties.
abstract: The Cu(II) ions usually have different coordinated geometry to other 3d ions, especially Ni(II) and Co(II) ions, in azido-carboxylate mixed ligand systems. That provides a potential way to synthesize rare heterometallic 3d-3d azido complexes with peculiar magnetic properties. Assembling Cu(II), M(II) (M = Ni and Co), azido and nicotinic acid in hydrothermal condition, two novel isomorphic 3D heterometallic 3d-3d azido complexes, [CuM(N(3))(2)(nicotinate)(2)](∞) (M = Ni(II) for 1 and Co(II) for 2) were obtained. The structure of the complexes can be described as EO azido and syn,syn carboxylate mixed bridged spin sequence chains (-1/2-J(1)-1-J(2)-1/2- for 1 and -1/2-J(1)-3/2-J(2)-1/2- for 2) linked by the pyridyl groups. Dominant ferromagnetic interactions were observed between the Cu(II) and M(II) ions in the chains despite the largest M-N-M angle of about 129° in the 3d metal azido-carboxylate mixed coordinated systems and weak antiferromagnetic interactions between the chains. At low temperature, a spin-flop phase transition was present in the Co(II) involved complex 2.
authors.affiliation: School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China.
authors.forename: Jiong-Peng
authors.initials: JP
authors.lastname: Zhao
authors.forename: Ran
authors.initials: R
authors.lastname: Zhao
authors.forename: Qian
authors.initials: Q
authors.lastname: Yang
authors.forename: Wei-Chao
authors.initials: WC
authors.lastname: Song
authors.forename: Bo-Wen
authors.initials: BW
authors.lastname: Hu
authors.forename: Xiao-Feng
authors.initials: XF
authors.lastname: Zhang
authors.forename: Xian-He
authors.initials: XH
authors.lastname: Bu