Molecular motions in the solid state: the thermochromic nitro-nitrito Interconversion in nickel(II) bis(diamine) complexes

Marta Ansa Hortalá; Luigi Fabbrizzi; Francesco Foti; Maurizio Licchelli; Antonio Poggi; Michele Zema

doi:10.1021/ic026085h

Molecular motions in the solid state: the thermochromic nitro-nitrito Interconversion in nickel(II) bis(diamine) complexes

Inorg Chem. 2003 Feb 10;42(3):664-6. doi: 10.1021/ic026085h.

Authors

Marta Ansa Hortalá¹, Luigi Fabbrizzi, Francesco Foti, Maurizio Licchelli, Antonio Poggi, Michele Zema

Affiliation

¹ Dipartimento di Chimica Generale, Università di Pavia, via Taramelli 12, I-27100 Pavia, Italy.

PMID: 12562176
DOI: 10.1021/ic026085h

Abstract

The NO(2)(-) ion, in the trans-octahedral [Ni(II)(N,N'-dimethylethylenediamine)(2)(NO(2))(2)](H(2)O) complex, coordinates the metal through the nitrogen atom (nitro form). On heating the solid complex, the anion rotates to give nitrito coordination (oxygen bound), according to a reversible process. The coordination mode of NO(2)(-) to Ni(II) is related to the steric interplay between the anion and the alkyl substituents on the diamine.