CRYSTAL STRUCTURES OF TWO PHOSPHONATE SALTS: MONOCYCLOHEXYLAMMONIUM HYDROGEN PHOSPHONATE AND MONOCYCLOHEXYLAMMONIUM PHENYL PHOSPHONATE

Modou Sarr,Mouhamadou Birame Diop,Mouhamadou Sembene Boye,Aminata Diasse-Sarr,Philippe Guionneau

doi:10.29081/jesr.v26i2.168

Abstract

Hydrogen phosphonate anions and monocyclohexylammonium cations interacting through hydrogen bonds conduct to the formation of a salt namely monocyclohexylammonium hydrogen phosphonate. In this structure, hydrogen phosphonate anions are linked by pairs through O—H···O hydrogen bonds leading to anionic dimers. Each dimer is connected to its two neighbours through cations via N—H···O hydrogen bonds leading to infinite chains which are then connected by N—H···O hydrogen bonds giving rise to a layered structure. The phenyl phosphonates form dimers that are connected through an expended hydrogen bonding network involving the cations into a layer.

Highlights

Interest in phosphonate chemistry is owed to the applications they display [1, 2] as well as their properties such as proton conductivity [3, 4], optical [5] and catalyst properties [6]
The Dakar group focusing in phosphonate characterization has reported several works [810]
The studied phosphonates salts 1 and 2 both describe a dianionic dimer in which two phosphonate anions are linked through strong H-bonds

Summary

INTRODUCTION

Interest in phosphonate chemistry is owed to the applications they display [1, 2] as well as their properties such as proton conductivity [3, 4], optical [5] and catalyst properties [6]. 42 of these structures are hydrogen phosphonate ammonium salts and 19 are metallic compounds. Among the 42 ammonium salts, 3 structures contain both hydrogen phosphonate and, fluorophosphonate (FPOH2-), phosphonic acid or phosphonate. The CSD shows 20 structures containing hydrogen phenyl phosphonates with an alkaline or an organic counter cation. Five (5) of these hydrogen phenyl phosphonate compounds contain phenyl phosphonic acid molecules. Continuing to focus in phosphonato organotin(IV), compound 2 was first isolated by serendipitous by mixing trimethyltin chloride with monocyclohexyl amine in the presence of phenyl phosphonic acid, PhPO(OH). Monocyclohexyl amine and hydrogen phosphonic acid, HPO(OH) leading to the isolation of compound 1 (Figure 1). The reaction between monocyclohexyl amine and phenyl phosphonic acid has been took out yielding crystals of compound 2 (Figure 1).

EXPERIMENTAL SETUP

RESULTS AND DISCUSSION

CONCLUSIONS