Two mixed-ligand lanthanide-hydrazone complexes: [Pr(NCS)3(pbh)2].H2O and [Nd(NCS)(NO3)(pbh)2(H2O)]NO3.2.33H2O [pbh is N'-(pyridin-2-ylmethylidene)benzohydrazide, C13H11N3O]

Abstract

The gel-mediated syntheses and crystal structures of [N'-(pyridin-2-ylmethylidene-kN)benzohydrazide-k2N',O]tris(thiocyanato-kN)praseodymium(III) monohydrate, [Pr(NCS)3(C13H11N3O)2].H2O, (I), and aqua(nitrato-k2O,O')[N'-(pyridin-2-ylmethylidene-kN)benzohydrazide-k2N',O](thiocyanato-kN)neodymium(III) nitrate 2.33-hydrate, [Nd(NCS)(NO3)(C13H11N3O)2(H2O)]NO3.2.33H2O, (II), are reported. The Pr3+ ion in (I) is coordinated by two N,N,O-tridentate N'-(pyridin-2-ylmethylidene)benzohydrazide (pbh) ligands and three N-bonded thiocyanate ions to generate an irregular PrN7O2 coordination polyhedron. The Nd3+ ion in (II) is coordinated by two N,N,O-tridentate pbh ligands, an N-bonded thiocyanate ion, a bidentate nitrate ion and a water molecule to generate a distorted NdN5O5 bicapped square antiprism. The crystal structures of (I) and (II) feature numerous hydrogen bonds, which lead to the formation of three-dimensional networks in each case.