A new open-framework iron borophosphate from ionic liquids
- A new open-framework iron borophosphate, \(KFe[BP_{2}O_{8}(OH)]\), has been obtained by ionothermal synthesis from \(KH_{2}PO_{4}\), \(FeCl_{3}∙4H_{2}O\), \(H_{3}BO_{3}\) and \([C_{4}mpyr]\)Br (1-butyl-1-methylpyrrolidinium bromide). Single-crystal X-ray diffraction analysis shows that \(KFe[BP_{2}O_{8}(OH)]\) (monoclinic, \(\it P2_{1}/c, a\) = 9.372(2) Å , \(\it b\) = 8.146(2)Å , \(\it c\) = 9.587(2) Å, \(\it {\beta}\) = 101.18(3)°, \(\it V\) = 718.0(2)\(Å^{3}\) and \(\it Z\) = 4) has a three-dimensional (3-D) framework structure composed by {\({Fe(III)O_{5}(OH)}\)} octahedra as well as {\(BO_{3}(OH)\)} and {\(PO_{4}\)} tetrahedra. As anionic structural sub-unit, \(KFe[BP_{2}O_{8}(OH)]\), contains an infinite open-branched {\([BP_{2}O_{8}(OH)]^{4-}\)} chain which is formed by alternating {\(BO_{3}(OH)\)} and {\(PO_{4}\)} tetrahedra. {\(Fe(III)O_{5}(OH)\)} octahedra share common O corners with five phosphate tetrahedra and the OH corner links to the hydrogen borate group to give a 3D framework. The negative charges of the inorganic framework are balanced by \(K^{+}\) ions.
Creative Commons - CC BY 3.0 Unported - Attribution 3.0 Unported