Syntheses, Structures, and Magnetic Properties of Copper(II) Complexes with 1,3-[Bis(2-pyridylmethyl)amino]benzene (1,3-tpbd) as Ligand

✍ Scribed by Simon P. Foxon; Gemma Romualdo Torres; Olaf Walter; Jens Zacho Pedersen; Hans Toftlund; Martina Hüber; Karsten Falk; Wolfgang Haase; Joan Cano; Francesc Lloret; Miguel Julve; Siegfried Schindler

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 221 KB
• Volume: 2004
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200300426

✦ Synopsis

Abstract

The dinuclear copper(II) complexes {Cu~2~(1,3‐tpbd)(H~2~O)(OAc)~2~~2~}~0.23~{Cu~2~(1,3‐tpbd)(H~2~O)~2~(OAc)~3~}~0.77~·0.77H~2~O (1), Cu~2~(1,3‐tpbd)(H~2~O)~2~(OAc)~2~~2~·2H~2~O (2), and the tetranuclear copper(II) complex [Cu~4~(1,3‐tpbd)~2~(H~2~O)~2~(SO~4~)~4~]·8H~2~O (3) {1,3‐tpbd = 1,3‐bis[bis(2‐pyridylmethyl)amino]benzene} were synthesised and structurally characterised by X‐ray diffraction. Variable‐temperature (2.0−290 K) magnetic susceptibility measurements on these complexes as well as on the dinuclear copper(II) complex [Cu~2~(1,3‐tpbd)(H~2~O)~2~(ClO~4~)~3~]ClO~4~ (4) (whose structure was published earlier) were performed. In contrast to 2 and 3, significant ferromagnetic coupling with J = +9.3 cm^−1^ was observed for 4 (the Hamiltonian being defined as Hˆ = −J Sˆ~1~·Sˆ~2~). Density functional theory (DFT) calculations were used successfully for the interpretation of the ferromagnetic coupling observed in 4. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)