STRONTIUM AND BARIUM BIS[N,N'-BIS(TRIMETHYLSILYL)BENZAMIDINATES] FROM THE ADDITION-REACTION OF THE ALKALINE-EARTH METAL BIS[BIS(TRIMETHYLSILYL)AMIDES] AND BENZONITRILE

The reaction of strontium bis[bis(trimethylsilyl)amide] with benzonitrile yields strontium bis[N,N'bis(trimethylsilyl)benzamidinate] . 2THF, which crystallizes in the orthorhombic space group Pbcn (a = 1845.4(3); b = 1311,3(2); c = 1838,(3) pm; Z = 4). During the similar reaction of barium bis[bis(trimethylsilyl)amide] with benzonitrile the benzonitrile adduct barium bis[N,N'-bis(trimethylsilyl)benzamidinate] . 2 THF . benzonitrile is formed. After the addition of diphenylacetylene to the strontium di(benzamidinate) in diglyme a clathrate of the composition strontium bis[N,N'-trimethylsilyl)benzamidinate] . diglyme . diphenylacetylene could be isolated; the spectroscopic data as well as the X-ray structure (monoclinic, C2/c, a = 1492.2(2); b = 1539.1(2); c = 2337.8(3)pm; Z = 4) confirm the isolated appearance of the acetylene molecule without interaction to the metal center in solution and in the solid state, respectively.