A tri-nuclear Co(II) complex of formula [CO(3)(phen)(3)(L1)(2)] [L1=2,2',3,3'-tetrahydroxy-benzaldazine, phen=1.10-phenanthroline] has been prepared. The complex was characterized by X-ray crystal analysis, ESI-MS and its UV-Vis spectrum. The room temperature value of chi(m)T is 7.50 emu K mol(-1), which is larger than the expected value of 5.58 emu K mol(-1) (for three isolated high spin Co(II) ions). When the temperature is lowered the chi(m)T product continuously decreases down to 5.0 K, which indicates the presence of antiferromagnetic coupling between the Coll ions. (C) 2010 Elsevier B.V. All rights reserved.
Effective methods for the synthesis of hydrazones, quinazolines, and Schiff bases: reaction monitoring using a chemometric approach
choice for the quinazolines, while the solid-state melt reaction is more efficient for derivatives of (iso)nicotinic based hydrazones. Crystalline amine-functionalised hydrazones 4a and 4b undergo post-synthetic modifications in reactions with 3- or 4-pyridinecarbaldehyde vapours to form hydrazone-Schiff bases 4a-3py, 4b-3py, 4a-4py, and 4b-4py. Mechanochemical and vapour-mediated reactions are followed