Coordination compounds of lanthanides with acetylhydrazine

Abstract

Coordination compounds M(AH) nX 3·mH 2O, M = Pr, Nd, Eu, Gd, Dy, Ho, Er, Tm, Lu; X = Cl, NO 3 n = 3, 4, 5; X = NCS, n = 3; m = 0, 1, 3; AHCH 3CONHNH 2 were isolated from water or ethanol solutions by reactions of lanthanide salts with acetylhydrazine. On the bases of IR and Raman Spectra investigations of the normal and deuterated complexes it was shown that all these compounds contain chelate metal-hydrazide rings. ▪ (M = Pr, Nd, Eu, Gd, Dy, Ho, Er, Tm, Lu). The crystal structure of compounds [Dy(AH) 3(H 2O) 3]Cl 3 (I), [Ho(AH) 3(H 2O) 3]Cl 3 (II), [Er(AH) 4(H 2O)](NO 3) 3 (III), [Pr(AH) 5](NO 3) 3 (IV) were determined. The coordination numbers were found 9 in I–III and 10 in IV. The polyhedron of metals has the configuration of threecapped trigonal prism in I and II, the configuration of monocapped square antiprism in III and configuration of twocapped square antiprism in IV. The metal-ligand bond lengths (mid.) in complexes are: LnN: 2.571(1), 2.542 (iii), 2.760 Å (IV); LnN(AH): 2.360 (I), 2.337 (III), 2.497 Å (IV); LnO(H 2O): 2.425 (I), 2.363 Å (III). H-bonds type OH⋯O(Cl) and NH⋯(Cl) in complexes observed