کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1404324 | 984905 | 2008 | 7 صفحه PDF | دانلود رایگان |
Two helical coordination polymeric copper(II) complexes bearing amino acid Schiff bases HL or HL′, which are condensed from 2-hydroxy-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–H⋯Cu interactions to build a 2-D network. While in [CuL′]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.
Journal: Journal of Molecular Structure - Volume 872, Issue 1, 15 January 2008, Pages 40–46