Abstract
The mononuclear [Yb racL]Cl 3·2H 2O and dinuclear [Yb 2(OH) 2Cl 2( racL) 2]Cl 2·4CH 3OH·2H 2O complexes of the macrocyclic ligand L derived from trans-1,2-diaminocyclohexane and 2,6-diformylpyridine have been obtained. The formation of the dinuclear species upon addition of hydroxide to the [Yb racL]Cl 3·2H 2O or the enantiopure [Yb rrrrL(NO 3) 2](NO 3) has been followed using 1H NMR spectroscopy. The X-ray crystal structure of [Yb 2(OH) 2Cl 2( racL) 2]Cl 2·4CH 3OH·2H 2O complex has been determined. The complex is a dimer consisting of two macrocyclic units. The Yb(III) ion is coordinated by six nitrogen atoms of the macrocyclic ligand, two bridging OH groups and chloride anions. The chiral macrocycle L in this complex exhibits twist-bent conformation of approximate C 2 symmetry.
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