Allyl strontium compounds: synthesis, molecular structure and properties

作者：Jochmann Phillip; Davin Julien P; Maslek Stefanie; Spaniol Thomas P; Sarazin Yann; Carpentier Jean Francois; Okuda Jun^*

来源：Dalton Transactions, 2012, 41(30): 9176-9181.

DOI：10.1039/c2dt30743j

The synthesis and attempted isolation of neutral bis(allyl)strontium [Sr(C3H5)(2)] (1) resulted in the isolation of potassium tris(allyl) strontiate K[Sr(C3H5)(3)] (2). In situ generated 1 shows a pronounced Bronsted basicity, inducing polymerisation of THF. Ate complex 2 crystallises as [K(THF)(2){Sr(C3H5)(3)}(THF)](infinity) (2.(THF)(3)). The salt-like solid state structure of 2.(THF)(3) comprises a two-dimensional network of (mu(2)-eta(3):eta(3)-C3H5)(-) bridged potassium and strontium centres. Synthesis of allyl complexes 1 and 2 utilised SrI2, [Sr(TMDS)(2)] (3) (TMDS = tetramethyldisilazanide), and [Sr(HMDS)(2)] (HMDS = hexamethyldisilazanide) as strontium precursors. The solid state structure of previously reported [Sr(TMDS)(2)] (3) was established by X-ray single crystal analysis as a dissymmetric dimer of [Sr-2(TMDS)(4)(THF)(3)] (3.(THF)(3)) with multiple Si-H center dot center dot center dot Sr agostic interactions. The presence of ether ligands (THF, 18-crown-6) influenced the Si-H center dot center dot center dot Sr resonances in the NMR spectra of the amido complex 3.

• 出版日期2012