SPECTRAL AND MAGNETIC STUDY OF COPPER(II) MEFANAMATES: CRYSTAL AND MOLECULAR STRUCTURE OF BIS(MEFANAMATO)DI(N,N-DIETHYLNICOTINAMIDE)DI(AQUA)COPPER(II)

• Published in: Journal of coordination chemistry Vol. 44; no. 1-2; pp. 163 - 172
• Main Authors: Melník, M., Koman, M., Macáŝková, L'., Glowiak, T.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.05.1998
• Subjects: Caffeine; copper(II); crystal structure; Dimmers; Mefanomate
• ISSN: 0095-8972; 1029-0389
• DOI: 10.1080/00958979808022890

The synthesis and characterization of Cu(II) mefanamate (mef) compounds of composition Cu(mef) 2 L (L = water, caffeine, or methyl-3-pyridylcarbamate) and Cu(mef) 2 L 2 (L = 3-pyridylcarbinol, nicotinamide, N,N-diethylnicotinamide, 2,6-dimethanol pyridine or nicotine) is reported. Characterizations of the compounds were based on elemental analyses, electronic, infrared and EPR spectra and magnetic susceptibility measurements over a temperature range (80-290 K). The spectral and magnetic properties of Cu(mef) 2 L indicate the presence of Cu(II) dimers structurally similar to that of Cu(II) acetate monohydrate. All the Cu(mef) 2 L 2 compounds possess octahedral stereochemistry about Cu(II) with differing tetragonal distortion. An X-ray analysis of Cu(mef) 2 (Et 2 nia) 2 (H 2 O) 2 was carried out, and it featured tetragonal bipyramidal geometry around the Cu(II) atom. The tetragonal plane is created by mefanamate anions bonded to the Cu(II) atom via the unidentate carboxylate oxygen atoms [Cu-0(2) = 1.936(3)Å] and the pyridine ring nitrogen atoms of the neutral ligand N, N-diethylnicotinamide [Cu-N(l) = 2.027(3)Å] in frans-positions. Axial water molecules [Cu-O(4) = 2.557(3)Å] complete the coordination sphere.