Investigation of solid-state photochemical nitro-nitrito linkage isomerization: crystal structures of trans-bis-(ethyl-enedi-amine)(iso-thio-cyanato)-nitritocobalt(III) salts: thio-cyanate, chloride monohydrate, and perchlorate-thio-cyanate-(0.75/0.25).

ABSTRACT: The reaction cavities of the nitro groups in the crystals of the title compounds, trans-[Co(NO₂)(NCS)(C₂H₈N₂)₂]·X, X = SCN^- (I), Cl^-·H₂O (II), and (ClO₄ ^-)_0.75(SCN^-)_0.25 (III), have been investigated, revealing that the geometry of the inter-molecular N-H?O hydrogen bonds in (I) is unsuitable for nitro-nitrito photo-isomerization. The common main building block of these crystal structures is a centrosymmetric pair of complex cations connected by pairwise N-H?O(nitro) hydrogen bonds forming an R ₂ ²(4) ring, which is a narrow diamond shape in (I) but is approximately square in (II) and (III). The structure of (I) was reported earlier [Börtin (1976 ?). Acta Chem. Scand. A, 30, 503-506] but is described here with an improved disorder model for the thio-cyanate anions and to higher precision.

SUBMITTER: Ohba S 

PROVIDER: S-EPMC6176456 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature