Structure refinement of zinc containing gallophosphate with the ULM-5 structure

A zinc containing microporous gallophosphate with the ULM-5 structure has b een hydrothermally synthesised in the presence of fluoride ions and 1,6-dia minohexane as a structure-directing agent. It was characterised using signl e-crystal X-ray diffraction (R=5.3%) and EDAX elemental analysis. The compo und crystallises in the orthorhombic space ground P2(1)2(1)2 with unit cell parameters a = 24.814(13) Angstrom, b = 18.458(5) Angstrom, c = 10.2575(18 ) Angstrom. EDAX analysis revealed up to 6(2) wt.% of zinc in the structure . The examination of Ga-O bond distances showed the 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 ar e well defined. The nitrogen atoms on both template molecules are ordered a nd hydrogen bonded to framework oxygen and fluorine atoms. Three of the twe lve carbon atoms are disordered, each over two sites.