A Binuclear Copper(II) Complex with Two Symmetric End-on Azido Bridges. Synthesis, Spectroscopy, Crystal Structure and Magnetism

Abstract

A binuclear copper(II) complex with two symmetric end-on azido bridges: ½Cu 2 ðtacnÞ 2 ðl-N 3 Þ 2 ðClO 4 Þ 2 Á CH 3 OH (1), where tacn=1,4,7-triazacyclononane, has been synthesized and structurally as well as magnetically characterized. Compound (1) has the discrete binuclear structure, bridged by two end-on N 3 ) anions. The macrocyclic ligand tacn functions as a terminal ligand. The magnetic data of compound (1) were analyzed by means of H ¼ À2JŜ 1Ŝ2 À DŜ Z , leading to J=2.49 cm )1 , g=2.08, D=±0.97 cm )1 , zJ¢ =)0.47 cm )1 . The ferromagnetic interaction is discussed on the basis of the structural features and is compared with the model structure of Ruiz.

Synthesis, Crystal Structure and Spectroscopy of catena-poly-bis(azido-N1,N1)(2-Aminopyrimidine)Copper(II)

“…But even at 20 K the band is still broad (peak-topeak distance 170 mT). Such broad signals are also observed in the literature for other azide-bridging Cu(II) compounds [31][32][33].…”

Tuning the bridging modes of Cu-azido complexes with Schiff bases by varying the terminal groups

“…Bond lengths Cu1-O1 1.910(5) Cu1-N1 1.944 (5) eight-membered chelate ring Cu-NNN-Cu-NNN is 25.9(3)°. The Cu-N-Cu bridging angle in the l 1,1 -azido-bridged dinuclear core is 88.9(3)°.…”

“…The rational design and synthesis of polynuclear complexes, aiming at understanding the factors that govern the final structures, are of continuing interest in coordination and structural chemistry. As is well known, the azido ligand can link two or more metal atoms through the l 1,1 -(end-on, EO), l 1,3 -(end-to-end, EE), l 1,1,3 -, and many other modes, yielding various polynuclear complexes that are difficult to achieve with other bridging ligands [4][5][6]. It seems that the azido ligands readily adopt l 1,1 -and l 1,3 -bridging modes in the complexes.…”

Syntheses, crystal structures and antibacterial activities of azido-bridged cobalt(III) complexes with Schiff bases

“…A number of bridging groups have been used to construct polynuclear complexes [1][2][3][4]. Pseudohalides, especially azide, are versatile polyatomic bridging units that can bind metal ions via end-on (EO, l 1,1 ), end-to-end (EE, l 1,1 ), and many other modes [5][6][7][8]. Multidentate Schiff base ligands have generally been used to construct the polynuclear complexes with azide bridges [9][10][11][12].…”