Two mixed-ligand lanthanide–hydrazone complexes: [Pr(NCS)3(pbh)2]·H2O and [Nd(NCS)(NO3)(pbh)2(H2O)]NO3·2.33H2O [pbh isN′-(pyridin-2-ylmethylidene)benzohydrazide, C13H11N3O]

Abstract

The gel-mediated syntheses and crystal structures of [N′-(pyridin-2-ylmethylidene-κN)benzohydrazide-κ2N′,O]tris(thiocyanato-κN)praseodymium(III) monohydrate, [Pr(NCS)3(C13H11N3O)2]·H2O, (I), and aqua(nitrato-κ2O,O′)[N′-(pyridin-2-ylmethylidene-κN)benzohydrazide-κ2N′,O](thiocyanato-κN)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 twoN,N,O-tridentateN′-(pyridin-2-ylmethylidene)benzohydrazide (pbh) ligands and threeN-bonded thiocyanate ions to generate an irregular PrN7O2coordination polyhedron. The Nd3+ion in (II) is coordinated by twoN,N,O-tridentate pbh ligands, anN-bonded thiocyanate ion, a bidentate nitrate ion and a water molecule to generate a distorted NdN5O5bicapped 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.