title: Unusual shift of a nitro group in a phenylhydrazo-β-diketone.
abstract: A novel para to meta shift of a nitro group at the phenyl ring of 3-(2-hydroxy-4-nitrophenylhydrazo)pentane-2,4-dione (H(2)L(1), 1), with formation of the new 3-(2-hydroxy-3,5-dinitrophenylhydrazo)pentane-2,4-dione (H(2)L(2), 2), occurs upon nitration of 1 with an equimolar amount of NaNO(2), under basic conditions. 2 acts as a polydentate ligand for the synthesis of the polymeric potassium [K(μ(5)-HL(2))](n) (3) and monomeric nickel(II) [Ni(H(2)O)(3)(L(2))]·H(2)O (4) compounds. They have been fully characterized, including single crystal X-ray analysis, and the complexes feature metal-organic (in 3) or supramolecular (in 4) 3D networks. The topological analysis of 3 reveals a uninodal 5-connected underlying net with the point symbol of (4(6).6(4)) and a very rare 5/4/t5 topology, which had not yet been observed in coordination polymers.
authors: Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Technical University of Lisbon, Lisbon, Portugal.
authors: Maximilian N
authors: MN
authors: Kopylovich
authors: Kamran T
authors: KT
authors: Mahmudov
authors: M Fátima C Guedes
authors: MF
authors: da Silva
authors: Alexander M
authors: AM
authors: Kirillov
authors: Armando J L
authors: AJ
authors: Pombeiro