Accession Number:

ADA091571

Title:

Oxy- and Thio Phosphorus Acid Derivatives of Tin. VII. The Crystal and Molecular Structure of Alpha-Phenylphosphonatotrimethyltin(IV) at 138 K. A Unique, One-dimensional, Helical.

Descriptive Note:

Technical rept.,

Corporate Author:

OKLAHOMA UNIV NORMAN DEPT OF CHEMISTRY

Report Date:

1980-11-01

Pagination or Media Count:

34.0

Abstract:

Alpha-PhenylphosphonatotrimethyltinIV, C9H1503PSn, forms colorless crystals. The structure was solved by the heavy atom method to an R value of 0.046 for the 2578 reflections collected at 138 or - 2K on an Enraf-Nonius CAD4 automatic diffractometer using MoK sub alpha radiation. The molecular units associate to form an infinite, one-dimensional polymer in which planar trimethyltinIV groups are axially-bridged by -O-P-O- linkages of the phenylphosphonate ligand to yield an almost perfect trigonal bipyramid at tin. The chains are linear at the tin atoms, but bent through a bite angle of 115.43 deg at phosphorus. The chains propogate helically through the crystal, and each phenylphosphonate PO and P-OH group is hydrogen bonded, holding adjacent helicies, turning in opposite directions, into two-dimensional sheets. The phenyl groups point outward from the center of the propagating helicies, separating the sheets from one another. Tin atoms occupy two non-equivalent environments, alternating metal atoms forming either two short or two long bonds to oxygen.

Subject Categories:

  • Polymer Chemistry
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE