Crystal structures and hydrogen bonding in the isotypic series of hydrated alkali metal (K, Rb and Cs) complexes with 4-aminophenylarsonic acid

Abstract

p-Arsanilic acid forms an isotypic set of three compounds with the alkali metals K, Rb and Cs, in which the primary layered coordination polymeric structures have similar asymmetric units comprising two independent and different metal cations and a bridging water mol­ecule which lie within crystallographic mirror planes parallel to (100). The layers are linked across [100] through amine N—H⋯O hydrogen bonds to arsonate and water O-atom acceptors, giving overall three-dimensional network structures.

Crystal structure of dibenzylammonium hydrogen (4-aminophenyl)arsonate monohydrate

“…To our knowledge, eleven examples including this fragment have already been identified: ammonium 4-nitrophenylarsonate (AHILAE: Yang et al, 2002) 4-hydroxy-3-nitrophenylarsonate monohydrate (XEMZIZ: Pan et al, 2006). In coordination chemistry, phenylarsonic acid and its derivatives constitute also suitable ligands to generate coordination polymers and heteropolyoxometalates in the presence of transition metals (Lesikar-Parrish et al, 2013), main-group metals (Xie et al, 2008), alkali metals (Smith & Wermuth, 2017a) and alkali-earth metal precursors (Smith & Wermuth, 2017b). Regarding the dibenzylammonium cation, [(C 6 H 5 CH 2 ) 2 NH 2 ] + , 117 hits incorporating such an entity were found in the Cambridge Structural Database.…”