Publication Date:
2012-04-15
Description:
The stable dinuclear [Cu(μ-C 2 O 4 )Cu] 2+ entity is facially coordinated at each end by a N -nitrile functionalized triazamacrocycle, 1,4,7-tris(cyanomethyl)-1,4,7-triazacyclononane ( L ), to generate a centrosymmetric compound [Cu 2 L 2 (μ-C 2 O 4 )](ClO 4 ) 2 · 4DMF ( 1 ) containing a bis-bidentate oxalate bridge. The variable-temperature magnetic measurement for the crystallographically characterized compound exhibits quite strong antiferromagnetic coupling interaction between two oxalate-linked Cu II atoms separated by 5.149 Å with a singlet-triplet energy gap of –345.5 cm –1 . On the other hand, a mononuclear Co III compound [Co L (N 3 ) 3 ] · 2.5H 2 O ( 2 ) with monodentate azide terminal groups was synthesized. Structural elucidation by X-ray diffraction shows that the compound has crystallographically imposed C 3 symmetry. Enantiomerically pure crystals were obtained upon crystallization indicated by a Flack parameter of 0.04(5).
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology