pyridine N-donor ligands picSR, where R=Me, Et, tBu, or Ph, coordinate to one iron atom of the diiron(II) center by the nitrogen and sulfur atoms to form a five-membered chelate ring. The Fe-S distance be-comes elongated with increasing steric hindrance imparted by the R group. The most sterically hindered ligands, 2-picSPh(Me3) and 2-picSPh(iPr3), bind to the metal only through the pyridine nitrogen
高产率地制备了不对称的三苯基-2'-
羧酸酯
配体3,
5-二甲基-1,1':3',1'-三苯基-2'-
羧酸酯-O2CArPh,Xyl。该
配体有助于二
铁(II)配合物[Fe2(micro-O2CArTol)2(O2CArPh,Xyl)2(THF)2]的组装[2,-O2CArTol = 2,6-二-对-
甲苯基
苯甲酸酯],[Fe2 (micro-O2CArTol)2(O2CArPh,Xyl)2(
吡啶)2](5),[Fe2(micro-O2CArPh,Xyl)2-(O2CArPh,Xyl)2(THF)2](3)和[Fe2 (micro-O2CArPh,Xyl)2(O2CArPh,Xyl)2(
吡啶)2](6),它们都具有风车的几何形状。6中的3.355 [10] A的
铁-
铁距离比类似物[Fe2(micro-O2CArTol)2(O2CArTol)2(
吡啶)2](4)的
铁-
铁距离短约1 A,并且近似于3.3