title: A new polytype of orthoboric acid, H(3)BO(3)-3T.
abstract: The crystal structure of H(3)BO(3)-3T, a new trigonal polytype of orthoboric acid, consists of sheets of hydrogen-bonded B(OH)(3) molecules similar to those found in the triclinic structure of orthoboric acid, H(3)BO(3)-2A. In each case, van der Waals forces connect the sheets. However, the stacking sequences of the sheets differ between the two polymorphs. In H(3)BO(3)-3T (space group P3(2)), the sheets are stacked in the repeating sequence ABC em leader, whereas in H(3)BO(3)-2A (space group P-1, the sheets are stacked in the repeating sequence AB em leader.
authors.affiliation: Department of Civil Engineering and Geological Sciences, 156 Fitzpatrick Hall, University of Notre Dame, IN 46556, USA. rshuvalo@nd.edu
authors.forename: Robert R
authors.initials: RR
authors.lastname: Shuvalov
authors.forename: Peter C
authors.initials: PC
authors.lastname: Burns