Crystal structure of SrCo4(OH)(PO4)3, a new hy-droxy-phosphate

Fatima-Zahra Cherif; Mhamed Taibi; Ali Boukhari; Jilali Aride; Abderrazzak Assani; Mohamed Saadi; Lahcen El Ammari

doi:10.1107/S2056989020007331

Crystal structure of SrCo₄(OH)(PO₄)₃, a new hy-droxy-phosphate

Acta Crystallogr E Crystallogr Commun. 2020 Jun 5;76(Pt 7):1022-1026. doi: 10.1107/S2056989020007331. eCollection 2020 Jul 1.

Authors

Fatima-Zahra Cherif¹, Mhamed Taibi², Ali Boukhari¹, Jilali Aride², Abderrazzak Assani¹, Mohamed Saadi¹, Lahcen El Ammari¹

Affiliations

¹ Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Science, Mohammed V University in Rabat, Avenue Ibn Batouta, BP 1014, Rabat, Morocco.
² Laboratoire de Physico-Chimie des Matériaux Inorganiques et Organiques, Centre des Sciences des Matériaux, Ecole Normale Supérieure, Mohammed V University in Rabat, Morocco.

Abstract

Single crystals of strontium tetra-cobalt tris-(orthophosphate) hydroxide, SrCo₄(OH)(PO₄)₃, were grown serendipitously under hydro-thermal conditions at 473 K. The crystal structure consists of undulating chains of edge-sharing [CoO₆] octa-hedra that are linked into (010) layers by common vertices between chains. Adjacent layers are linked along [010] into a framework structure by tetra-hedral [CoO₄] units and by PO₄ tetra-hedra. The framework delimits channels extending along [100] in which the eleven-coordinate strontium cations are situated. Bifurcated O-H⋯O hydrogen bonds of weak strengths consolidate the crystal packing. The title compound was also characterized by infrared spectroscopy.

Keywords: bifurcated hydrogen bonding; cobalt; crystal structure; infrared spectroscopy; orthophosphate; strontium.