Mo-nitrogenase. Moreover, the homocitrato vanadate(V) [VO 2(phen) 2] 2[V 2O 4( R,S-H 2homocit) 2].4H 2O.2C 2H 5OH ( 4) is isolated as a molecular precursor for the formation of mixed-valence complex 3. The V-O alpha-alkoxy and V-O alpha-carboxy bond distances of homocitrate complexes 3 and 4 are 1.858(4) and 1.968(6) av and 2.085(4) and 1.937(5) A, respectively. They are shorter than those of homocitrate
从弱酸性介质中分离出二聚体混合价
柠檬酸氧
钒钒[V 2O 3(phen)3(Hcit)]。5H 2O(1)(H 4cit =
柠檬酸,phen = 1,10-
菲咯啉)。可以定量地转化为1,10-
菲咯啉[V 2O 3(phen)3(Hcit)2(phen)3O 3V 2] .12H 2O(4)的
柠檬酸氧
钒四聚体加合物。红外光谱和X射线衍射图的痕迹证明了这一点。这两种化合物具有
柠檬酸双齿基团,它们通过其带负电荷的α-烷氧基和α-羧基氧原子仅螯合到一个
钒中心,而其他β-羧基和β-
羧酸基团则自由地参与强分子内和分子间氢键[分别为1中的2.45(1)和2中的2.487(2)A]。均
钒酸
钒(V / IV)[V 2O 3(phen)3(R,SH 2homocit)] Cl.6H 2O(3)(H 4homocit =高
柠檬酸),其结合方式与在Mo-硝化酶的R-homomotrato
铁钼辅因子中发现的结合方式相似。此外,分离出高
柠檬酸钒(V)[VO