Redetermination oftrans-diaquatetramethanolcobalt(II) bis(rac-1,1′-binaphthalene-2,2′-diylphosphate) methanol disolvate monohydrate: a two-dimensional supramolecular hydrogen-bonded network

Abstract

In the title compound, trans-[Co(CH3OH)4(H2O)2](C20H12PO4)2·2CH3OH·H2O, the crystal packing shows a separation of the hydro­phobic naphthyl ring systems from the hydro­philic part of the structure, viz. the (RO)2PO2− phosphate anion, the cobalt complex cation and the solvent mol­ecules. The binaphthyl tail-to-tail packing in the hydro­phobic layer is governed by weak C—H⋯π inter­actions. The present study performed at 203 K confirms the previous room-temperature study [McCann, Murphy, Cardin & Convery (1991), Polyhedron, 10, 2771–2777], but with improved precision. The centro­symmetric cobalt complex has very similar Co—O bond lengths and is isostructural with the trans-[Cu(H2O)2(CH3OH)4]2+ cation (which features a tetra­gonally compressed instead of the typical Jahn–Teller distorted elongated copper octa­hedron) in the isotypic copper(II) compound. The high degree of similarity in the Co and Cu structures shows the dominating effect of the hydrogen-bonding network on the metal coordination polyhedra. All H atoms of the Co and Cu aqua and methanol ligands are engaged in typical strong hydrogen-bonding inter­actions.