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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Transition metal complexes with sulfur ligands, CXXXIII - Synthesis, structure, and properties of new Fe-II complexes with [FeN2S2] cores [German]
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Transition metal complexes with sulfur ligands, CXXXIII - Synthesis, structure, and properties of new Fe-II complexes with [FeN2S2] cores [German]

机译:过渡金属配合物用硫配体,CXXXIII - 合成,结构和新Fe-II复合物的性质与[FEN2S2]核心[德语]

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摘要

In order to obtain suitable precursors for iron complexes that model the reactivity of the active sites of nitrogenases, the coordination chemistry of the [Fe('N2H2S2')] fragment was systematically investigated ('N2H2S2'(2-) = 1,2-ethanediamine-N,N'-bis(2-benzenethiolate)(2-)). One-pot reactions of FeCl2. 4H(2)O with the tetradentate amine-thiolate ligand 'N2H2S2'(2-) and CO, PR3, or P(OR)(3) yielded the complexes [Fe(CO)(2)('N2H2S2')] (1), [Fe(CO)(PR3)('N2H2S2')] (R = Et (2), Pr (3), Bu (4)), [Fe(PMe3)(2)('N2H2S2')] (7), [Fe(dppe)('N2H2S2')] (8, dppe = 1,2-bis(diphenylphosphine)ethane), and [Fe(P(OR)(3))(2)('N2H2S2')] (R = Me (9), Pr (10)). Mixed phosphane/phosphite complexes [Fe(PMe3)(P(OR)(3))('N2H2S2')] (R = Me (11), Pr (12)) were synthesized by PMe3/P(OPr)(3) exchange of the labile complexes [Fe(PMe3)(2)('N2H2S2')] (7) and [Fe(P(OPr)(3))(2)('N2H2S2')] (10). The [Fe(CO)(PR3)('N2H2S2')] complexes 3 and 4 also resulted from 1 and PR3 by photochemical CO substitution. They exhibit characteristic low-frequency nu(CO) bands (approximate to 1925 cm(-1)), and their remaining CO ligand proved photolytically inert. Reaction of 3 or 4 with NOBF4 yielded the dinuclear NO complex [Fe(NO)('N2HS2')](2) (6) which contains two amide functions. Contrary to expectations, [Fe(PR3)(2)('N2H2S2')] complexes could not be obtained with monodentate phosphanes other than PMe3. The corresponding N-methylated ligand 'N2Me2S2'(2-) yielded only the complexes [Fe(CO)(2)('N2Me2S2')] (15) and [Fe('N2Me2S2')] (16). X-ray structure analyses of complexes 7, 8 . MeOH, 3, [Fe(CO)(dppm)('N2H2S2')]. 0.5THF (5.0,5THF, dppm = bis(diphenylphosphino)methane), and 12 . 0,5'N2H2S2' HZ confirm the pseudo-octahedral coordination of the Fe centers by two trans-S and two cis-N donors and two cis-coligands. The structural data further suggest that the unexpected instability of the [Fe(PR3)(2)('N2H2S2')] complexes is not caused by steric but by electronic effects. The cyclic voltammograms and the reactivity of the [Fe(L)(L')('N2H2S2')] complexes corroborate this assumption. The oxidation behaviour of the [Fe(L)(L')('N2H2S2')] complexes depends critically on the coligands L and L'. Reaction of 1 with dioxygen leads to oxidative dehydrogenation of the 'N2H2S2'(2-) ligand and yields the dinuclear Schiff-Base complex [Fe('gma')](2) ('gma'(2-) = glyoxal-bis(2-mercaptoanil)(2-)). In contrast, oxidation of [Fe(CO)(PR3)('N2H2S2')], [Fe(PR3)(2)('N2H2S2')] and [Fe(P(OR)(3))(2)('N2H2S2')] complexes by dioxygen occurs metal-centered and gives the Fe(IV) complexes [Fe(PR3)('N2S2')] (R = Me, Pr), [Fe(P(OR)(3))('N2S2')] (R = Me) and [Fe('N2S2')](2) that contain the tetraanionic thiolate amide ligand 'N2S2'(4-). [References: 44]
机译:为了获得用于模拟氮酶的活性位点的反应性的铁配合物的合适前体,系统地研究了[Fe('N2H2S2')片段的配位化学('N2H2S2'(2-)= 1,2-乙二胺-N,N'-BIS(2-苯并噻嗪)(2-))。 FECL2的一锅反应。 4H(2)o用四烯醇胺 - 硫醇酸盐配体'N 2 H 2 S 2'(2-)和CO,PR3或P(或)(3)得到了复合物[Fe(CO)(2)('N2H2S2')]( 1),[Fe(CO)(PR3)('N2H2S2')](r =等(2),Pr(3),Bu(4)),[Fe(PME3)(2)('N2H2S2')] (7),[Fe(DPPE)('N2H2S2')](8,DPPE = 1,2-双(二苯基膦)乙烷)和[Fe(P(或)(3))(2)('N2H2S2' )](r = me(9),pr(10))。混合磷酸磷酸酯[Fe(PME3)(P(或)(3))('N2H2S2')](R = ME(11),PME3 / P(OPR)(3)合成Pr(12))交换不稳定复合物[Fe(PME3)(2)('N2H2S2')](7)和[Fe(P(P(P(OPR)(3))(2)('N2H2S2')](10)。 [Fe(CO)(PR3)('N2H2S2')]复合物3和4也由光化学CO取代引起1和PR3。它们表现出特征低频Nu(CO)带​​(近似至1925厘米(-1)),其余的CO配体被证明是光解的惰性。用NobF4的3或4的反应产生了含有两种酰胺功能的二核没有复合物[Fe(NO)('N2HS2')](2)(6)。与期望相反,[Fe(Pr3)(2)('N2H2S2')]复合物不能用除PME3之外的单常磷酸盐获得。相应的N-甲基化配体'N2ME2S2'(2-)仅得到复合物[Fe(CO)(2)('N2ME2S2')](15)和[Fe('N2ME2S2')](16)。复合物7,8的X射线结构分析。 MeOH,3,[Fe(CO)(DPPM)('N2H2S2')]。 0.5(5.0,5-5,DPPM =双(二苯基膦基)甲烷)和12。 0,5'N2H2S2'Hz通过两个Trans-S和两个CIS-N施主和两个CIS-COLIGAND确认FE中心的伪八半面对的协调。结构数据进一步表明[Fe(pr3)(2)('n2h2s2')]复合物的意外不稳定性不是由空间而是通过电子效果引起的。循环伏安图和[Fe(L)(L')('N2H2S2')]复合物的循环伏安图和反应性证实了这种假设。 [Fe(1)(L')('N2H2S2')]复合物的氧化行为主要取决于Coligands L和L'。用二恶英的反应导致“N 2 H 2 S 2”(2-)配体的氧化脱氢,并产生DioNclecleChiff-基络合物[Fe('GMA')](2)('GMA'(2-)=乙醛 - BIS (2-巯基)(2-))。相反,氧化[Fe(CO)(PR3)('N2H2S2')],[Fe(Pr3)(2)('N2H2S2')]和[Fe(P(或)(3))(2)( “N 2 H 2 S 2”)]通过二恶英复合物发生金属居中并给予Fe(IV)配合物[Fe(PR3)('N2S2')](R = ME,PR),[Fe(P(或)(3)) ('n2s2')](r = me)和[Fe('n2s2')](2),其含有四硫酸硫醇酸氨酸酰胺配体'n2s2'(4-)。 [参考:44]

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