title: Magnitudes and orientations of 31P chemical shielding tensors in Pt(II)-phosphine complexes and other four-fold coordinated phosphorus sites.
abstract: 31P MAS and double-quantum filtered 31P MAS NMR experiments at and near the n = 0 rotational resonance condition, as well as off-magic angle spinning 31P NMR experiments on two polycrystalline samples of Pt(II)-phosphine thiolate complexes are reported. Numerical simulations yield complete descriptions of the two 31P spin pairs. 195Pt MAS NMR spectra are straightforward to obtain but sensitively reflect only some parameters of the 195Pt(31P)2 three-spin system. Based on the 31P NMR results obtained and in conjunction with a large body of literature data and irrespective of the chemical nature of the specimen, a unified picture of the dominating motif of 31P chemical shielding tensor orientations of phosphorus sites with 4-fold coordination is identified as a local (pseudo)plane rather than the directions of P element bond directions.
authors.affiliation: Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany, and Institut für Anorganische Chemie II, Universität Erlangen, Egerlandstr. 1, D-91058 Erlangen, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Bechmann
authors.forename: Stephan
authors.initials: S
authors.lastname: Dusold
authors.forename: Franz
authors.initials: F
authors.lastname: Geipel
authors.forename: Angelika
authors.initials: A
authors.lastname: Sebald
authors.forename: Dieter
authors.initials: D
authors.lastname: Sellmann