Synthesis of tungsten complexes that contain hexaisopropylterphenyl-substituted triamidoamine ligands, and reactions relevant to the reduction of dinitrogen to ammonia

Synthesis of tungsten complexes that contain hexaisopropylterphenyl-substituted triamidoamine ligands, and reactions relevant to the reduction of dinitrogen to ammonia
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含有六异丙基三联苯取代的三酰氨基胺配体的钨配合物的合成,以及与二氮还原成氨相关的反应

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发表时间:
2005
期刊:
影响因子:
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通讯作者:
R. Schrock
R. Schrock
中科院分区:
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文献类型:
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作者:
D. Yandulov;R. Schrock

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[HIPTN 3 N]WCl(WCl)可以通过将H3[HIPTN 3 N]加入WCl 4(DME)中,然后加入LiN(SiMe 3)2([HIPTN 3 N]3 =[(HIPTNCH 2CH 2)3 N]3,其中HIPT = 3,5-(2,4,6-i-Pr 3C 6 H2)2C 6 H3 =六异丙基三联苯)来容易地合成。      在N2下,在苯中用KC 8还原WCl产生WN=NK。WN=NK在THF中容易被ZnCl 2氧化,得到锌金属和WN 2。在0.1 mol/L [Bu 4 N][BAr′4]/PhF电解液(Ar′ = 3,5-(CF 3)2C 6 H3)中,在2.27 V(vs.FeCp2 +/0)下,WN 2还原为[WN 2]是可逆的,而WN 2氧化为[WN 2]+在0.66V下也是可逆的。     WN=NK在苯中被[Et 3 NH][OTf]质子化基本上定量地产生WN=NH。在乙醚中,WN=NH在Nβ处与[H(OEt)2][BAr′4]质子化,定量地得到[W= NNH 2][BAr′4]。[W= NNH 2][BAr′4]在0.1mol/L [Bu 4 N][BAr′4]/PhF中的电化学还原在高达1V/s的扫描速率下是不可逆的。  NaBAr′4和NH3与WCl在PhF中加成生成[W(NH3)][BAr′4]。[W(NH3)][BAr′4]在0.1mol/L [Bu 4 N][BAr′4]/PhF体系中的电化学还原在2.06V(vs. FeCp)下是不可逆的。  
[HIPTN3N]WCl (WCl) can be synthesized readily by adding H3[HIPTN3N] to WCl4(DME) followed by LiN(SiMe3)2 ([HIPTN3N]3 = [(HIPTNCH2CH2)3N]3 where HIPT = 3,5-(2,4,6-i-Pr3C6H2)2C6H3 = HexaIsoPropylTerphenyl). Reduction of WCl with KC8 in benzene under N2 yields WN=NK. WN=NK is readily oxidized in THF by ZnCl2 to yield zinc metal and WN2. Reduction of WN2 to [WN2] is reversible at 2.27 V vs. FeCp2+/0 in 0.1 mol/L [Bu4N][BAr′4]/PhF electrolyte (Ar′ = 3,5-(CF3)2C6H3), while oxidation of WN2 to [WN2]+ is also reversible at 0.66 V. Protonation of WN=NK by [Et3NH][OTf] in benzene yields WN=NH essentially quantitatively. Protonation of WN=NH at Nβ with [H(OEt)2][BAr′4] in ether affords [W=NNH2][BAr′4] quantitatively. Electrochemical reduction of [W=NNH2][BAr′4] in 0.1 mol/L [Bu4N][BAr′4]/PhF is irreversible at scan rates of up to 1 V/s. Addition of NaBAr′4 and NH3 to WCl in PhF yields [W(NH3)][BAr′4]. Electrochemical reduction of [W(NH3)][BAr′4] in 0.1 mol/L [Bu4N][BAr′4]/PhF is irreversible at 2.06 V vs. FeCp...
DOI: 10.1021/ic040095w
发表时间: 2005-01
影响因子: 4.6
作者:
D. Yandulov;R. Schrock
通讯作者: D. Yandulov;R. Schrock
消除肌酸对固氮酶测定过程中产生的 NH3 靛酚测量的干扰。
DOI: 10.1006/abio.1997.2517
发表时间: 1998
期刊: Analytical biochemistry.
影响因子: --
作者:
Dilworth,MJ;Fisher,K
通讯作者: Fisher,K
DOI: 10.1021/ic001122v
发表时间: 2001-07-30
影响因子: 4.6
作者:
Greco, GE;Schrock, RR
通讯作者: Schrock, RR