Synthesis and structure of Cu5(BTA)6(TTA)4·5DMF, a copper-nitrogen cluster containing η3-benzotriazolate

The Me cluster compound — Cu5(BTA)6(TT-A) 4 · 5DMF was prepared using thenyltrifluoroacetone and benzotriazolate ligands. The crystal structure indicates that a tetrahedral array of Cu(1), Cu(2), Cu(3) and Cu(4) ions surrounding a central Cu(5) ion are held together by bridging tridentate BTA and terminated by TTA bond cap. The three nitrogen atoms of a BTA bond three different copper ions to form a η3-benzotriazolate. The central Cu ion has a distorted octahedral structure and the surrounding Cu ions are 5 coordinated forming distorted tetragonal structures. The distances between the surrounding Cu(II) ions and the central Cu(II) ion are in the range of 0.3561–0.3755 nm and those between the surrounding Cu(II) ions are in the range of 0.5785–0.6301 nm.