title: Molecular motions in the solid state: the thermochromic nitro-nitrito Interconversion in nickel(II) bis(diamine) complexes.
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.
authors.affiliation: Dipartimento di Chimica Generale, Università di Pavia, via Taramelli 12, I-27100 Pavia, Italy.
authors.forename: Marta
authors.initials: M
authors.lastname: Ansa Hortalá
authors.forename: Luigi
authors.initials: L
authors.lastname: Fabbrizzi
authors.forename: Francesco
authors.initials: F
authors.lastname: Foti
authors.forename: Maurizio
authors.initials: M
authors.lastname: Licchelli
authors.forename: Antonio
authors.initials: A
authors.lastname: Poggi
authors.forename: Michele
authors.initials: M
authors.lastname: Zema