Aminotroponiminate calcium and strontium complexes

Abstract

Heteroleptic aminotroponiminate complexes of calcium and strontium have been prepared. The monomeric calcium complex [{(iPr)₂ATI}CaI(THF)₃] 1 ((iPr)₂ATI = N-isopropyl-2-(isopropylamino)troponiminate) and the corresponding dimeric strontium compound [{(iPr)₂ATI}SrI(THF)₂]₂2 were obtained by reaction of [{(iPr)₂ATI}K] and MI₂. Whereas the mixed ligand compound of composition [{(iPr)₂ATI}Ca(iPrAT)]₂3 (iPrAT = 2-(isopropylamino)troponate) was not obtained via a salt metathesis but by reaction of [Ca{N(SiMe₃)₂}₂(THF)₂] with {(iPr)₂ATI}H and (iPrAT)H, the diphosphanylamido complex [{(iPr)₂ATI}Ca{(Ph₂P)₂N}(THF)₂] 4 was obtained by reaction of CaI₂ with the potassium compounds [{(iPr)₂ATI}K] and [K(THF)_n][N(PPh₂)₂]. The single crystal X-ray structures of all compounds were established and the latter compound shows a η²-coordination mode of the ligand via the nitrogen and one phosphorus atom.