Open AccessA second polymorph of [H 3 N(CH 2 ) 3 NH 3 ][V 4 O 10 ]
Author(s) -
Stephens Nicholas F.,
Lightfoot Philip
Publication year - 2006
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
eISSN - 1600-5759
pISSN - 0108-2701
DOI - 10.1107/s0108270106040777
Subject(s) - crystallography , vanadate , chemistry , monoclinic crystal system , vanadium , crystal structure , propane , stacking , oxide , stereochemistry , inorganic chemistry , organic chemistry
The title compound, propane‐1,3‐diammonium tetravanadate, (C 3 H 12 N 2 )[V 4 O 10 ], represents a second polymorph of composition β‐[H 3 N(CH 2 ) 3 NH 3 ][V 4 O 10 ]. It differs from the α polymorph [Riou & Ferey (1995). J. Solid State Chem. 120 , 137–145] in the conformation of the propane‐1,3‐diammonium dication which, in the present example, lies on a twofold axis and adopts a syn – syn rather than a syn – anti conformation. The twofold symmetry of this conformation thus co‐operates with the vanadium oxide framework to result in a higher symmetry for the resultant crystal, viz . C 2/ c versus P 2 1 / n . The overall unit‐cell parameters for the two polymorphs are similar, and the inorganic layer within each is topologically identical, comprising edge‐sharing V IV O 5 square pyramids linked together via corner‐sharing with V V O 4 tetrahedra. A key difference between the two polymorphs is a `head‐to‐head' versus `head‐to‐tail' stacking of the vanadyl groups in adjacent layers.