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Synthesis and Characterization of Platinum and Palladium Complexes Featuring a Rare Secondary Borane Pincer Motif
Organometallics ( IF 2.5 ) Pub Date : 2018-06-26 , DOI: 10.1021/acs.organomet.8b00306
Angelo Iannetelli 1 , Graham Tizzard 2 , Simon J. Coles 2 , Gareth R. Owen 1
Affiliation  

The synthesis and characterization of a series of platinum and palladium complexes containing a secondary borane Z-class ligand supported by 2-mercaptopyridine heterocycles is reported herein. Addition of 2 equiv of Na[H2B(mp)2] to [Pt(μ-Cl)(COEOMe)]2 (where COEOMe = 8-methoxycyclooct-4-en-1-ide) in the presence of 2 equiv of a tertiary phosphine (PR3 = PPh3, PCy3, PCyp3, P(o-tol)3, PPh2(o-tol), PPh2(2-(3-methyl)indolyl)) leads to the formation of the complexes [Pt{κ3-S,B,S-HB(mp)2}(PR3)] (16). Addition of 2 equiv of Na[H2B(mp)2] to [Pd(μ-Cl)(COEOMe)]2 in the presence of 2 equiv of a tertiary phosphine (PR3 = PPh3, PCy3, PCyp3, PPh2(o-tol)) leads to the formation of the complexes [Pd{κ3-S,B,S-HB(mp)2}(PR3)] (710). It was also demonstrated that the synthesis of the palladium complex 7 could be achieved from the palladium precursor [PdCl(Me)(COD)] (where COD = 1,5-cyclooctadiene) as an alternative synthetic strategy. In the above reactions, either the COEOMe fragment or the methyl fragment serves to act as a “hydride acceptor” facilitating the ultimate transformation of the borohydride-based ligand [H2B(mp)2] to the corresponding secondary borane κ3-S,B,S coordinated HB(mp)2 pincer ligand. The complexes [Pd{κ3-S,B,S-HB(mp)2}(PR3)] and [Pt{κ3-S,B,S-HB(mp)2}(PR3)] are rare examples of metal–borane complexes where one hydrogen substituent remains at the boron center. These compounds have particularly short palladium– and platinum–boron distances, the shortest of the structurally characterized compounds being 2.067(6) Å for [Pd{κ3-S,B,S-HB(mp)2}(PPh2(o-tol))] and 2.076(10) Å for [Pt{κ3-S,B,S-HB(mp)2}(PCy3)], respectively (the shorter distances of two independent complexes in the unit cells of both structures).

中文翻译:

铂和钯配合物具有罕见的二级硼烷钳形图案的合成与表征

本文报道了一系列的2-铂和钯配合物的合成和表征,所述铂和钯配合物包含2-巯基吡啶杂环支撑的仲硼烷Z-级配体。在[Pt(μ-Cl)(COE OMe)] 2(其中COE OMe = 8-甲氧基环-4-en-1-ide)的存在下添加2当量的Na [H 2 B(mp)2 ] 。 2当量的叔膦(PR 3 = PPh 3,PCy 3,PCyp 3,P(o- tol)3,PPh 2o- tol),PPh 2(2-(3-甲基)吲哚基)导致复合物的形成[Pt {κ3 - S,B,S -HB(mp)2 }(PR 3)](16)。在2当量的叔膦存在下,向[Pd(μ-Cl)(COE OMe)] 2中添加2当量的Na [H 2 B(mp)2 ] (PR 3 = PPh 3,PCy 3,PCyp 3,PPH 2ø -tol))通向配合物[钯{κ形成3 - S,B,S -HB(MP)2 }(PR 3)](7 - 10)。还证明了可以从钯前体[PdCl(Me)(COD)](其中COD = 1,5-环辛二烯)作为替代合成策略来实现钯配合物7的合成。在上述反应中,无论是COE OME片段或甲基片段用来充当“氢化物受体”促进基于硼氢化物配体的最终转化[H 2 B(MP)2 ] -为相应的次级硼烷κ 3 - S,B,S协调HB(MP)2钳配体。的配合物[钯{κ 3 - S,B,S -HB(MP)2 }(PR 3)]和[铂{κ 3 - S,B,S -HB(MP)2 }(PR 3)]是金属-硼烷配合物罕见例子,其中一个氢取代基保持在硼中心。这些化合物具有特别短的钯和铂-硼的距离中,最短的结构特征在于化合物为2.067(6)。一种用于[Pd中{κ 3 - S,B,S -HB(MP)2 }(PPH 2ø -tol))〕和2.076(10)一种用于[PT {κ 3 - S,B,S -HB(MP)2 }(PCY 3)],分别为(较短在单元电池的两个独立的复合物的距离两种结构)。
更新日期:2018-06-27
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