Aminotroponiminate calcium and strontium complexes

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