Metal Coordinated Tri- and Tetraborane Analogues
Résumé
A series of triborane and tetraborane analogues have been isolated and structurally characterized utilizing chalcogenatoborate ligancis Li[BH3(EPh)] (E = S or Se). Thermolysis of [Cp*TaCl4] in the presence of Li[BH3(SPh)] afforded bimetallic tantallaheteroborane [(Cp*Ta)(2)(mu-eta(3):eta(3)-B2H4S)(mu-eta(2):eta(2)-SBH3)] (1) and hexasulfido trimetallic complex [(Cp*Ta)(2)(mu-S)(4)(mu-SPh)(2)] (2). Compound 1 is a fused ditantallaheteroborane, in which both di- and triborane analogues are stabilized by two tantalum atoms. In an attempt to synthesize the selenium analogues of 1 and 2, room-temperature reaction of [Cp*TaCl4] with Li[BH3(SePh)] was carried out, which afforded bimetallic tantallaheteroborane [(Cp*Ta)(2){mu-eta(3):eta(3)-B3H6(SePh)}{mu-SePh}(2)] (3), monometallic tantal- laheteroboranes [Cp*Ta(SePh)(2){B4H8-n(SePh)(2)}] (4: n = 0, 5: n = 1), and trimetallic species [(Cp*Ta)(3)(mu-Se)(4){mu-Se-2(Se)}] (6). Compound 3 is the rarest example of triborane analogue {B3H6(SePh)} in the coordination sphere of two tantalum atoms. Whereas compounds 4 and 5 are examples of unsaturated metallaheteroboranes, in which the tetraborane analogues are stabilized in the coordination sphere of tantalum. One of the unique features of 3 and 5 is the presence of terminal B-SePh. Compound 6 has similar Ta3Se6 trisbutterfly core as that of 2 with additional bridging selenide unit. All the compounds have been characterized by NMR spectroscopy, mass spectrometry, IR spectroscopy and single-crystal X-ray diffraction studies.
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Kar et al-2021-Metal Coordinated Tri- and Tetraborane Analogues.pdf (3 Mo)
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Kar_ejic202100687-sup-0001-misc_information.pdf (3.32 Mo)
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