Maja Mrak, Madeleine Helliwell, Alenka Ristić, Nataša Zabukovec Logar, and Venčeslav Kaučič
National Institute of Chemistry, Ljubljana, Slovenia, University
of Manchester, England, and University of Ljubljana, Slovenia
A zinc containing microporous gallophosphate with the ULM-5 structure
has been hydrothermally synthesised in the presence of fluoride ions and
1,6-diaminohexane as a structure-directing agent. It was characterised
using single-crystal X-ray diffraction (R=5.3%) and EDAX elemental analysis.
The compound crystallises in the orthorhombic space group P21212 with unit
cell parameters a = 24.814(13) A, b = 18.458(5) A, c = 10.2575(18) A. EDAX
analysis revealed up to 6(2) wt.% of zinc in the structure. The examination
of Ga-O bond distances showed that zinc is preferentially located on one
of the 5-coordinated gallium sites. No zinc was found on the extra-framework
positions. The two 1,6-diaminohexane template molecules are well defined.
The nitrogen atoms on both template molecules are ordered and hydrogen
bonded to framework oxygen and fluorine atoms. Three of the twelve carbon
atoms are disordered, each over two sites.