Etude structurale et vibrationnelle d'un nouveau composé complexe de cobalt: [Co(imidazole)4Cl]Cl

Abstract

In the title complex, chloridotetrakis(1H-imidazole-κN3)cobalt(II) chloride, [CoCl(C3H4N2)4]Cl, the CoIIcation has a distorted square-pyramidal coordination environment. It is coordinated by four N atoms of four imidazole (Im) groups in the basal plane, and by a Cl atom in the apical position. It is isostructural with [Cu(Im)4Cl]Cl [Morzyk-Ociepaet al.(2012).J. Mol. Struct.1028, 49–56] and [Cu(Im)4Br]Br [Hossaini Sadret al.(2004).Acta Cryst. E60, m1324–m1326]. In the crystal, the [CoCl(C3H4N2)4]+cations and Cl−anions are linkedviaN—H...Cl hydrogen bonds, forming layers parallel to (010). These layers are linkedviaC—H...Cl hydrogen bonds and C—H...π and π–π [inter-centroid distance = 3.794 (2) Å] interactions, forming a three-dimensional framework. The IR spectrum shows vibrational bands typical for imidazol groups. The monoclinic unit cell of the title compound emulates an orthorhombic cell as its β angle is close to 90°. The crystal is twinned, with the refined ratio of twin components being 0.569 (1):0.431 (1).