Synthesis, structure, and magnetic properties of two 1-D helical coordination polymeric Cu(II) complexes

✍ Scribed by He-Dong Bian; Xiao-E Yang; Qing Yu; Zi-Lu Chen; Hong Liang; Shi-Ping Yan; Dai-Zheng Liao

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 753 KB
• Volume: 872
• Category: Article
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2007.02.009

✦ Synopsis

Two helical coordination polymeric copper(II) complexes bearing amino acid Schiff bases HL or HL 0 , which are condensed from 2hydroxy-1-naphthaldehyde with 2-aminobenzoic acid or L-valine, respectively, have been prepared and characterised by X-ray crystallography. In [CuL] n (1) the copper(II) atoms are bridged by syn-anti carboxylate groups giving infinite 1-D right-handed helical chains which are further connected by weak C-HÁ Á ÁCu interactions to build a 2-D network. While in [CuL 0 ] n (2) the carboxylate group acts as a rare monatomic bridge to connect the adjacent copper(II) atoms leading to the formation of a left-handed helical chain. Magnetic susceptibility measurements indicate that 1 exhibits weak ferromagnetic interactions whereas an antiferromagnetic coupling is established for 2. The magnetic behavior can be satisfactorily explained on the basis of the structural data.