Synthesis and characterization of Sn-Sn multiple bonds using modified bulky terphenyl ligands.

Yang Peng, Roland C. Fischer, W. Alexander Merrill, James C. Fettinger, Philip P. Power

Research output: Contribution to conference(Old data) Lecture or Presentationpeer-review


The heavier group 14 element alkyne analogs 4-X-Ar'SnSn-Ar'-4-X (4-X-Ar'= C6H2-4-X-2, 6-(C6H3-2,6-iPr)2, X = H, MeO, tBu, F, SiMe3 and GeMe3; 1, 2, 3, 4, 5, 6) have been isolated and characterized. They were prepd. by direct redn. of the corresponding aryltin (II) chloride precursors, ArSnCl with KC8. X-ray crystallog. showed that 1-4 have trans-bent structures with similar Sn-Sn bond distances [Sn-Sn = 2.67Å] and trans-bending angles [Sn-Sn-C = 125°]. In contrast, the structures of 5 and 6 differ dramatically from 1-4. The introduction of SiMe3 or GeMe3 at the para-position of the central aryl ring in 5 and 6 induces a strongly bent single bonded structure without alteration of the steric crowding near the tin center. The Sn-Sn distances [Sn-Sn = 3.07Å] are lengthened by ca 0.4 Å and the bending angles [Sn-Sn-C = 99.25°] are ca 26° narrower. The theor. calcns. show that relatively small amts. of energy sep. two different bonding modes of the tin alkyne analogs and suggest that changed packing forces in 5 and 6 cause the large structural changes. [on SciFinder(R)]
Original languageEnglish
Publication statusPublished - 2008

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