Metal Coordinated Tri‐ and Tetraborane Analogues. Issue 43 (21st September 2021)

• Record Type: Journal Article
• Authors: Kar, Sourav; Bairagi, Subhash; Kar, Ketaki; Roisnel, Thierry; Dorcet, Vincent; Ghosh, Sundargopal
• Is Part Of: European journal of inorganic chemistry. Issue 43(2021)
• Page Start: 4443
• Page End: 4451
• Publication Date: 2021-09-21
• Subjects: Boranes -- Chalcogens -- Metallaheteroboranes -- Tantalum -- Structure elucidation; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.202100687
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract: A series of triborane and tetraborane analogues have been isolated and structurally characterized utilizing chalcogenatoborate ligands Li[BH3 (EPh)] (E=S or Se). Thermolysis of [Cp*TaCl4 ] in the presence of Li[BH3 (SPh)] afforded bimetallic tantallaheteroborane [(Cp*Ta)2 ( μ‐η 3 :η 3 ‐B2 H4 S)( μ ‐ η 2 : η 2 ‐SBH3 )] (1 ) and hexasulfido trimetallic complex [(Cp*Ta)3 ( μ‐ S)4 ( μ ‐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 { μ ‐ η 3 : η 3 ‐B3 H6 (SePh)}{ μ ‐SePh}2 ] (3 ), monometallic tantallaheteroboranes [Cp*Ta(SePh)2 {B4 H8‐n (SePh)n }] (4 : n=0, 5 : n=1), and trimetallic species [(Cp*Ta)3 ( μ‐ Se)4 { μ ‐Se2 (Se)}] (6 ). Compound 3 is the rarest example of triborane analogue {B3 H6 (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 Ta3 Se6 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. Abstract : Diborane, triborane analogue, and tetraborane analogue stabilized in the coordination sphere of tantalum atom(s). New early transition metal coordinated triborane and tetraborane analogues have been synthesized utilizing chalcogenatoborate ligands Li[BH3 (EPh)] (E=S or Se) and structurally characterized. Also, theoretical calculations have given insight into their bonding and electronic structures.