title: Preparation of RSn(I)-Sn(I)R with two unsymmetrically coordinated Sn(I) atoms and subsequent gentle activation of P4.
abstract: This article reports the reduction of [{2,6-iPr(2)C(6)H(3)NC(CH(3))}(2)C(6)H(3)SnCl] (1) with potassium graphite to afford a new distannyne [{2,6-iPr(2)C(6)H(3)NC(CH(3))}(2)C(6)H(3)Sn](2) (2) with a Sn-Sn bond. The most striking phenomenon of 2 is the presence of two differently coordinated Sn atoms (one is three-coordinated, the other is four-coordinated). The Sn-Sn bond length in 2 is 2.8981(9) Å, which is very close to that of a Sn-Sn single bond (2.97-3.06 Å). To elucidate the nature of the Sn-Sn bond, DFT calculation is carried out that shows there is no multiple bond character in 2. Furthermore, the reaction of 2 with white P(4) affords the tetraphosphabicylobutane derivative 3. This is the first example of gentle activation of white phosphorus by a compound with low valent Sn atoms. Note that, unlike 2, in 3 both Sn atoms are four-coordinated.
authors.affiliation: Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, D-37077 Göttingen, Germany.
authors.forename: Shabana
authors.initials: S
authors.lastname: Khan
authors.forename: Reent
authors.initials: R
authors.lastname: Michel
authors.forename: Johannes M
authors.initials: JM
authors.lastname: Dieterich
authors.forename: Ricardo A
authors.initials: RA
authors.lastname: Mata
authors.forename: Herbert W
authors.initials: HW
authors.lastname: Roesky
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Demers
authors.forename: Adam
authors.initials: A
authors.lastname: Lange
authors.forename: Dietmar
authors.initials: D
authors.lastname: Stalke
mesh_terms: D018360:Crystallography, X-Ray; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D014001:Tin / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D014001:Tin