Synthesis and structure of six-coordinate iron borohydride complexes supported by PNP ligands.

Synthesis and structure of six-coordinate iron borohydride complexes supported by PNP ligands.
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PNP配体支持的六配位硼氢化铁配合物的合成与结构

DOI:
10.1021/ic402762v
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发表时间:
2014
影响因子:
4.6
通讯作者:
S. Schneider
S. Schneider
中科院分区:
化学2区
文献类型:
--
作者:
I. Koehne;T. J. Schmeier;E. A. Bielinski;C. J. Pan;W. H. Bernskoetter;C. Würtele;M. K. Takase;N. Hazari;S. Schneider

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报道了一系列HN{CH_2CH_2(PR_2)}_2[R =异丙基(iPrPNP)或环己基(CyPNP)]型配体负载的铁配合物的制备。这是首次将这种重要的双功能配体与铁配位。在一氧化碳存在下,通过合适的配体与FeCl 2反应,合成了铁(Ⅱ)配合物(iPrPNP)FeCl 2(CO)(1a)和(CyPNP)FeCl 2(CO)(1b),通过Fe(CO)5与iPrPNP在紫外光照射下反应,合成了铁(0)配合物(iPrPNP)Fe(CO)2(2a)。化合物2在二氯甲烷中不稳定,通过中间体铁(II)配合物[(iPrPNP)FeCl(CO)2]Cl(3a)氧化为1。2a与HCl反应生成相应的配合物[(iPrPNP)FeH(CO)2]Cl(4a),而中性铁配合物(iPrPNP)FeHCl(CO)(5a)和(CyPNP)FeHCl(CO)(5 b)则通过1b与1当量nBu 4 NBH 4反应得到。1a与过量NaBH 4之间的相关反应生成不寻常的η1-HBH 3络合物(iPrPNP)FeH(η1-HBH 3)(CO)(6a)。该配合物的特点是在与η1-HBH 3配体相关的两个氢原子和钳形配体的N-H质子之间存在分叉的分子内氢键,以及分子间氢键。6a与2,6-lutinium四苯基硼酸盐的质子化导致形成二聚络合物[{(iPrPNP)FeH(CO)}2(μ2,η1:η1-H2 BH 2)][BPh 4](7a),其特征在于μ2,η1:η1-H2 BH 2配体的罕见实例。与所有先前的具有μ2,η1:η1-H2 BH 2配体的络合物的例子不同,在7a中没有金属-金属键和额外的桥连配体支持硼氢化物配体;然而,提出两个二氢键相互作用稳定络合物。配合物1a、2a、3a、4a、5a、6a和7a的晶体结构经X-射线衍射表征。
The preparation of a number of iron complexes supported by ligands of the type HN{CH2CH2(PR2)}2[R = isopropyl (iPrPNP) or cyclohexyl (CyPNP)] is reported. This is the first time this important bifunctional ligand has been coordinated to iron. The iron(II) complexes (iPrPNP)FeCl2(CO) (1a) and (CyPNP)FeCl2(CO) (1b) were synthesized through the reaction of the appropriate free ligand and FeCl2in the presence of CO. The iron(0) complex (iPrPNP)Fe(CO)2(2a) was prepared through the reaction of Fe(CO)5withiPrPNP, while irradiating with UV light. Compound2ais unstable in CH2Cl2and is oxidized to1avia the intermediate iron(II) complex [(iPrPNP)FeCl(CO)2]Cl (3a). The reaction of2awith HCl generated the related complex [(iPrPNP)FeH(CO)2]Cl (4a), while the neutral iron hydrides (iPrPNP)FeHCl(CO) (5a) and (CyPNP)FeHCl(CO) (5b) were synthesized through the reaction of1aor1bwith 1 equiv ofnBu4NBH4. The related reaction between1aand excess NaBH4generated the unusual η1-HBH3complex (iPrPNP)FeH(η1-HBH3)(CO) (6a). This complex features a bifurcated intramolecular dihydrogen bond between two of the hydrogen atoms associated with the η1-HBH3ligand and the N–H proton of the pincer ligand, as well as intermolecular dihydrogen bonding. The protonation of6awith 2,6-lutidinium tetraphenylborate resulted in the formation of the dimeric complex [{(iPrPNP)FeH(CO)}2(μ2,η1:η1-H2BH2)][BPh4] (7a), which features a rare example of a μ2,η1:η1-H2BH2ligand. Unlike all previous examples of complexes with a μ2,η1:η1-H2BH2ligand, there is no metal–metal bond and additional bridging ligand supporting the borohydride ligand in7a; however, it is proposed that two dihydrogen-bonding interactions stabilize the complex. Complexes1a,2a,3a,4a,5a,6a, and7awere characterized by X-ray crystallography.
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