Treatment of o‐(diphenylphosphino)aniline with 3‐formylacetylacetone led to the formation of the ketimine type Schiff base 3‐((o‐diphenylphosphino‐phenylamino)‐methylene)‐pentane‐2,4‐dione (o−PPh₂−C₆H₄−NH−CH=C(COCH₃)₂, HL). Complexes [ML₂] (M=Fe, Co, Ni, Cu) were obtained from the reaction of HL with the corresponding metal acetate or acetylacetonate derivatives. The [ML₂] complexes (M=Fe, Co, Ni) exhibit a distorted octahedral coordination from two tridentate P,N,O ketiminate ligands L⁻. The arrangement of the ligands is meridional in the case of [FeL₂] and [NiL₂]_. The cobalt complex [CoL₂] displays a facial coordination. In the case of the nearly square planar copper complex [CuL₂], only the ketiminate functionalities of the ligands are involved in coordination and the participation of the PPh₂ groups is neglectable.

中文翻译：

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新型三齿P，N，O-Ketiminate配体的合成与配位行为

用3-甲酰基乙酰丙酮处理邻-（二苯基膦基）苯胺导致形成酮亚胺型席夫碱3-（（（邻-二苯基膦基-苯氨基）-亚甲基）-戊烷-2,4-二酮（o -PPh ₂ -C ₆ H ₄ -NH-CH ＝ C（COCH ₃）₂，HL）。配合物[ML ₂ ]（M = Fe，Co，Ni，Cu）是由HL与相应的金属乙酸盐或乙酰丙酮化物衍生物反应制得的。的[ML ₂ ]配合物（M =铁，钴，镍）表现出扭曲的八面体配位来自两个三齿P，N，O ketiminate配体L ^- 。在[FeL₂ ]和[NiL ₂ ] _。钴配合物[CoL ₂ ]显示出面部协调性。在接近正方形的平面铜络合物[CuL ₂ ]的情况下，仅配位体的酮酸酯化官能团参与配位，而PPh ₂基团的参与可忽略不计。