The Structures of Mono and Bis β-Diketonate Tin(IV) Alkoxide Complexes

Abstract

Tin(IV) alkoxides react with pentane-2,4-dione (acetylacetone) and other β-diketones to yield Sn(OR)3(chel) or Sn(OR)2(chel)2 derivatives. Sn(Opri)3(acac) has been shown to be dimeric in the solid state by a single-crystal X-ray diffraction study, the tin atoms being linked by two alkoxide bridges. In solution l19sn n.m.r. spectral data show that this single complex rapidly converts into a mixture of tin-containing species followed by slow disproportionation to the bis derivative Sn(OPri)2(acac)2 and Sn(Opri)4. The bis complexes Sn(OR)2(acac)2 appear to exist predominantly in solution with cis arrangements of alkoxide groups even when OBut or 2,2,6,6-tetramethylheptane-3,5-dione (dipivaloylmethane) are present.

Crystal structure of tris[oxo-bis(2,4-pentanedionato)tin(IV)], [SnO(acac)2]3

“…Here the modification led to an oxo ß-diketonato species [SnO(acac)2b that could be isolated and characterized. Bond lengths and angles are similar to the values reported in the Literature for such species [1][2][3][4][5][6][7]. The distorted octahedral environment for the metal atom and the cis position for the acetylacetonato ligands are similar to Sn(OEt)2(acac)2.…”

Solid state and solution structural investigation of homoleptic tin(IV) alkoxide compounds. Part I. Sn(O—t-Bu)4 and [Sn(O—i-Pr)4•HO—i-Pr]2

“…The title compounds were prepared by modifications of the literature methods (14,16). Since S n ( s t -B~)~ is a good source of other tin alkoxide compounds, its synthesis is described here in detail.…”

“…Synthesis of Sn(0-~-BU)~ s n ( & t -B~)~ was prepared by a modified method of Chandler et al (14) as follows. To a three-necked, round-bottomed, one-litre flask fitted with a dinitrogen inlet, reflux condensor, pressure-equalized addition funnel, and magnetic stir bar was added 250 mL of n-pentane and 30.2 g (0.5 mol) of SnC14.…”

Synthesis of poly(styrene oxide) with different molecular weights using tin catalysts

“…The reactions were carried out similarly to the preparations of β-diketonate tin(IV) propoxide and tetrafluorophthalate tin(IV) butoxide complexes. [10,11] The formulations of compounds were determined by elemental analysis, FTIR, and NMR measurements. The number of oxo group was one for both compounds.…”