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
 

ABSTRACT

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.