Figure 7
The structure of 4, showing (a) {Na(H2O)4+}n chains involving bridging water molecules; intrachain hydrogen bonding between pairs of axial water molecules (shown as black and white bonds) `pinches' the O atoms in these molecules together in pairs. (b) The antiparallel slipped stacking pattern of Hhba− anions and (c) the packing arrangement, viewed along the b axis. Colour code: Na yellow, carboxylate and phenolate O red, water O green, C black and H pale pink. |