Reactivity of bis(cyclohexylammonium) 4-nitrophenylphosphate with SnMe3 Cl. X-ray structure of 4-NO2 C6 H4 PO4(SnMe3)2·H2 O

Abstract

The reaction of bis(cyclohexylammonium) 4-nitrophenylphosphate with Me 3 SnCl (1:2) under reflux in ethanol yielded the title compound 4-NO 2 C 6 H 4 PO 4 (SnMe 3 ) 2 ·H 2 O (1). The X-ray crystallographic analysis achieved on single crystals obtained by slow evaporation at room temperature revealed the formation of an unexpected supramolecular coordination network. The elementary building block can be viewed as two Me 3 Sn moieties linked by a bridging 4-nitrophenylphos- phate ligand. The two tin atoms are five-coordinated and describe a trans-Me 3 SnO 2 geometry in a trigonal bipy- ramidal arrangement. However, the Sn atoms are distinct, exhibiting two different environments. Thus, one is linked to two axial oxygen atoms from two distinct phosphato groups, whereas the other is bound to one phosphato oxy- gen atom and to a water molecule. From a supramolecular point of view, the combination of the tridentate binding mode of 4-NO 2 C 6 H 4 PO 4 and the additional formation of intermolecular hydrogen bonding interactions between NO 2 /H 2 O and PO 4 /H 2 O groups gives rise to a three-dimen- sional lattice network.