Investigation of nitro-nitrito photoisomerization: crystal structures of trans-{2,2'-[ethane-1,2-diylbis(nitrilo-methyl-idyne)]diphenolato}(pyridine/4-methyl-pyridine)-nitro-cobalt(III).

ABSTRACT: The reaction cavities of the nitro groups in the title compounds, trans-{2,2'-[ethane-1,2-diylbis(nitrilo-methyl-idyne)]diphenolato-?4 O,N,N',O'}(nitro-?N)(pyridine-?N)cobalt(III), [Co(C16H14N2O2)(NO2)(C5H5N)], (I), and trans-{2,2'-[ethane-1,2-diylbis(nitrilo-methyl-idyne)]diphenolato-?4 O,N,N',O'}(4-methyl-pyridine-?N)(nitro-?N)cobalt(III), [Co(C16H14N2O2)(NO2)(C6H7N)], (II), have been investigated to reveal that the inter-molecular CMe-H?O(nitro) contacts in (II) are unfeasible for the nitro-nitrito photochemical linkage isomerization process. In (I), there are two independent complexes showing similar conformations, and the central five-membered chelate ring of the tetra-dentate salen ligand adopts the same absolute configuration. This is the result of pseudo-spontaneous resolution, since the configuration of the five-membered chelate ring may frequently be reversed in solution. In the crystals of (I) and (II), the mol-ecules are linked into three-dimensional networks by C-H?O hydrogen bonds.

SUBMITTER: Ohba S 

PROVIDER: S-EPMC6281106 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature