名称:
Synthesis, characterisation, reactivity and X-ray crystal structure of a mixed-ligand η1-salicylaldehyde complex of Mn (III)
摘要:
A tridentate ligand L has been synthesised from salicylaldehyde and 1-dimethylamino-2-propylamine. It undergoes partial hydrolysis to regenerate salicylaldehyde in methanolic KOH solution. Reaction of manganese(II) acetate with this solution, followed by addition of sodium thiocyanate; produces a dark brown complex [Mn(L)(NCS){o-(CHO)C6H4O}] (1), which has been crystallographically characterised. Coordination of Mn is Jahn-Teller distorted octahedral by L, salicylaldehyde, and thiocyanate. The coordinated aldehyde group reacts with 2-aminoethanol and with 2-aminophenol to give mononuclear neutral Mn(III) complexes 2 and 3, respectively, with mixed Schiff-base ligands, [Mn(L)(L')]. Complexes 1 and 2 are high-spin, while 3 is low-spin. (C) 1998 Elsevier Science Ltd. All rights reserved.