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Reactivity of [Cp*Mo(CO) Me], 1 with various chalcogenide ligands such as Li[BH E] and Li[BH EFc] (E = S, Se or Te; Fc = (C H-Fe-C H)) has been described. Room temperature reaction of 1 with Li[BH E] (E = S and Se) yielded metal chalcogenide complexes [Cp*Mo(CO) ( η-S CCH)], 2 and [Cp*Mo(CO) ( η-SeC H)], 3. In compound 2, {Cp*Mo(CO) } fragment adopts a four-legged piano-stool geometry with a η-dithioacetate moiety. In contrast, treatment of 1 with Li[BH (EFc)] (E = S, Se or Te; Fc = C H-Fe-C H) yielded borate complexes [Cp*Mo(CO) (μ-H)(μ-EFc)BH ], 4-6 in moderate yields. Compounds 4-6 are too unstable and gradual conversion to [{Cp*Mo(CO) } (μ-H)(μ-EFc] ( 7: E = S; 8: Se) and [{Cp*Mo(CO) } (μ-TeFc) ], 9 happened by subsequent release of BH . All the compounds have been characterized by mass spectrometry, IR, multinuclear NMR spectroscopy and structures were unequivocally established by crystallographic analysis for compounds 2, 3 and 7. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Chemistry and reactivity of dimolybdathiaborane, [(CpMo)BSH], 1, obtained from the reaction of 2-mercaptobenzothiazole, [CpMoCl] and [LiBH.thf], has been explored with dinuclear metal carbonyl [Fe(CO)]. As a result, reaction of 1 with [Fe(CO)] yielded heterometallathiaborane, [(CpMo)BHSFe(CO)], 2 in good yield. Both the new compounds have been characterized in solution by H, B and C NMR spectroscopy and the structural types were unequivocally established by X-ray crystallographic analysis of compound 2. Cluster 2 has a bicapped octahedral geometry with the {Fe(CO)} fragment occupying one of the high-connectivity cluster vertexes rather than a capping position. Interestingly, cluster 1 undergoes geometric changes (bicapped trigonal bipyramid → bicapped octahedron) on the addition of two-electron {Fe(CO)} fragment to 1. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

Abstract : Treatment of nido-[1,2-(Cp*Ru)2(μ-H)2B3H7], 1 with five equivalents of Te powder led to the isolation of diruthenium pentalene analogue [(Cp*Ru){(Cp*Ru)2B6H14}(RuCp*)], 2 and a metal indenyl complex [(Cp*Ru)2B2H6C6H3(CH3)], 3. The [(Cp*Ru)2B6H14] fragment in 2 may be considered as a true metal-boron analogue of η5-η5-pentalene ligand (C8H6) and [(Cp*Ru)B2H6C6H3(CH3)] fragment in 3 is an analogue of η5-indenyl ligand. The solid-state X-ray structures were unambiguously determined by crystallographic analysis of compounds 2 and 3. Further, the density functional theory (DFT) calculations were performed to investigate the bonding and the electronic properties of 2a (Cp analogue of 2). The frontier molecular orbital analysis of both 2a and 2b (Cp analogue of [(Cp*Ru)B8H14(RuCp*)]) reveals a lower HOMO-LUMO gap indicating less thermodynamic stability.Graphical Abstract: SYNOPSIS Treatment of nido-[1,2-(Cp∗Ru)2(μ-H)2B3H7] with Te powder led to the isolation of diruthenium pentalene analogue [(Cp*Ru){(Cp*Ru)2B6H14}(RuCp*)] and a metal indenyl complex [(Cp*Ru)2B2H6C6H3(CH3)]. [ABSTRACT FROM AUTHOR]