Tris(4-oxy-pyridinium)nitrato lanthanide complexes [M(4-O-C 6H 4NH) 3(NO 3) 2(H 2O) 2][NO 3] {M = La, Ce, Pr, Nd, Eu, Gd} – Synthesis, properties and structural characterization

• Published in: Inorganica Chimica Acta 2010-10, Vol.363 (12), p.2990-2995
• Main Authors: Anjaneyulu, O., Prasad, T.K., Kumara Swamy, K.C.
• Format: Article
• Language: English
• Subjects: 4-Hydroxypyridine; Chirality; Coordination geometry; Lanthanide complexes; X-ray structure
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2010.03.035

Synthesis and structures of six lanthanide complexes [M(4-O-C 6H 4NH) 3(NO 3) 2(H 2O) 2][NO 3] {M = La, Ce, Pr, Nd, Eu, Gd} is described. The metal ion in these complexes has a tricapped trigonal prismatic structure. The neodymium complex in the solid state has a configuration different from the rest of the complexes. Preferential formation and X-ray structures of tris(4-hydroxypyridinium) nitrato complexes [M(4-O-C 6H 4NH) 3(NO 3) 2(H 2O) 2][NO 3] {M = La, Ce, Pr, Nd, Eu, Gd} in the simple reaction of 4-hydroxypyridine with the respective nitrates is described. All these compounds are isostructural and crystallize in the space group P2 12 12 1. There are, however, minor differences in the hydrogen bonding features. The central metal ion in all these complexes has a coordination number of nine and the geometry may be described as tricapped trigonal prism. The neodinium complex has a chirality opposite to that of the rest of the structures. TGA data are also consistent with the solid state structures of these compounds.