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Superweak Complexes of Tetrahedral p_4 Molecules with the Silver Cation of Weakly Coording Anions

机译:四面体p_4分子的超弱配合物和弱配位阴离子的银阳离子

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The silver aluminates AgAl[OC(cf_3)_2(R)]_4(R=H,CH_3, CF_3)reat with solutions of white posphourus p_4 to give complees that bind one or two almost undistorted tetrahedral P_4 molecules in an #tea#~2 fashion: [Ag(P_4)_2]~+[Al(OC(CF_3)_3)_4]~-(1) containing the first homoleptic metal-phosphorus cation , the molecular species(P_4AgAl[OC(H)(CF_3)(CF_3)_2]_4)(2), and the dimeric Ag(#mu#, #eta#~2-P_4)Ag biridged {(P_4)AgAl[OC(H)(CF_3)_2]_4}_2(3). Compounds 1-3 were characterized by variable-tmperature (VT)~(31)P NMR spectroscopy (1 also by VT ~(31)P MAS-NMR spectroscopy), Raman specroscopy, and sigle-crystal X-ray crystallography. Other Ag: p_4 ratios did not lead to new species, and this observation was ration alized on thermodynamic grounds . The Ag(P_4)_2~+ ion has an almost planar coor~-dination environment around the Ag~+ ion due to d_(x~2-y~2)(Ag)->(P-P) backbonding. Calculations (HF-DFT) on six Ag(P_4)_2~+ isomers 4a-f showed that the planar #eta#~2 form 4a is only slightly favored by 5.2kJ mol~(-1) over the tetrahedral #eta#~2 species 4b; #erta#~1-P_4 and #eta#~3-P_4 complexes are less favorable(27-76 kJ mol~(-1) ). The bonding of the P_4 moiety in [RhCl(#eta#~2-P_4)(PPh_3)_2], the only compound in which an #eta#~2 bonding mode of a tetrahedral P_4 molecule has been claimed,must be regarded as a tetraphosphabicyclobutane, and not as a tetrahedro-P_4 complex, on the basis of the published NMR and vibrational spectra, the calculated geometry of [RhCl(P_4)(PH_)_2](10), the highly endothermic (385 kJ mol ~(-1) calculated dissociation enthalpy of 10 into P_4 and RhCl(PH_3)_2 (11) , as well as atoms in molecules(AIM) and natural bond orbital (NBO) population analyses of 10 and the Ag(P_4)_2~-ion . Therefore, 1-3 are the first examples of species containing #eta#~2-coordinated tetrahedral P_4 molecules
机译:银与白色金缕梅p_4溶液一起铝化AgAl [OC(cf_3)_2(R)] _ 4(R = H,CH_3,CF_3),得到结合物,这些结合物结合#tea#〜中的一个或两个几乎未扭曲的四面体P_4分子。 2种形式:[Ag(P_4)_2]〜+ [Al(OC(CF_3)_3)_4]-(1)包含第一均配金属磷阳离子,其分子种类为(P_4AgAl [OC(H)(CF_3) (CF_3)_2] _4)(2),和二聚Ag(#mu#,#eta#〜2-P_4)Ag联立{{P_4)AgAl [OC(H)(CF_3)_2] _4} _2(3 )。化合物1-3通过变温(VT)〜(31)P NMR光谱法(1也通过VT〜(31)P MAS-NMR光谱法),拉曼光谱法和单晶X射线晶体学表征。其他的Ag:p_4比率并未导致新物种的出现,并且该观察结果基于热力学理由而合理化。由于d_(x〜2-y〜2)(Ag)->(P-P)的反向键合,Ag(P_4)_2〜+离子在Ag〜+离子周围具有几乎平坦的配位环境。对六个Ag(P_4)_2〜+异构体4a-f的计算(HF-DFT)显示,平面#eta#〜2形式4a仅比5.2kJ mol〜(-1)稍好于四面体#eta#〜 2种4b; #erta#〜1-P_4和#eta#〜3-P_4配合物不太有利(27-76 kJ mol〜(-1))。必须将[RhCl(#eta#〜2-P_4)(PPh_3)_2]中的P_4部分键合,这是唯一要求四面体P_4分子具有#eta#〜2键合模式的化合物。根据已发表的NMR和振动光谱,计算出[RhCl(P_4)(PH _)_ 2](10)的几何构型,即高吸热(385 kJ mol〜( -1)计算了10分解成P_4和RhCl(PH_3)_2(11)的焓,以及分子中的原子(AIM)和自然键轨道(NBO)种群分析了10和Ag(P_4)_2〜-离子因此,1-3是包含#eta#〜2-配位四面体P_4分子的物种的第一个例子

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