Tl^I[C(SiMe₃)₃]—An Alkylthallium(I) Compound with a Distorted Tetrahedron of Tl Atoms in the Solid State

Abstract

onal bipyramid could be refined with an occupancy factor of 0.08. The second position of the cluster can be explained by a rotation of the molecule and formally by the occupation of another face of the In, tetrahedron; its In atoms exhibit normal distances to quarternary C atoms, so that the rest of the molecular structure seems to be little influenced by the disorder. Crystallographic data (excluding structure factors) for the structure reported in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication no. . Copies of the data can be obtained free of charge on application to The Director, CCDC, 12 Union Road,

Ni[In{C(SiMe3)3}4]: An Organometallic Nickel-Indium Compound Analogous to [Ni(CO)4]

“…These fundamental processes are particularly important in carbene and arene chemistry. [1,2] In this context, the electrophilic arylcarbene chelate complexes 1 (X Cl) and 2 (X OMe) are good candidates for promoting new reactions within the coordination sphere, since the chelating group X can be activated by the Lewis acidic organo-iron fragment [3,4] or dissociate to provide a vacant coordination site. [5,6] Here we report on the reactivity of 1 and 2 [5] towards alkoxides.…”

“…The monomeric alkyl ± element(i) compounds E ± R containing the bulky alkyl substituent C(SiMe 3 ) 3 and the monovalent, coordinatively and electronically unsaturated elements Ga, In, and Tl have recently been identified unambiguously as degradation products of the tetrahedral clusters E 4 [C(SiMe 3 ) 3 ] 4 .…”

“…[1±3] The molecular structure of the most stable compound, GaC(SiMe 3 ) 3 , was determined by electron diffraction in the gas phase above 200 8C. [4] The tetrathallium compound is only weakly associated in the solid state and dissociates completely to the monomer on dissolution in benzene, [3] while the tetragallium cluster shows complete dissociation into the monomers only at high dilution in benzene.…”

“…[4] The tetrathallium compound is only weakly associated in the solid state and dissociates completely to the monomer on dissolution in benzene, [3] while the tetragallium cluster shows complete dissociation into the monomers only at high dilution in benzene. [1] The most stable of the clusters is In 4 [C(SiMe 3 ) 3 ] 4 (1).…”

Metallorganische Verbindungen von einwertigen Elementen der 13. Gruppe: schwache Assoziation an monomere, vielseitige Zweielektronen-Donoren

“…Der erste Durchbruch auf diesem Gebiet wurde mit zwei verschiedenen Synthesestrategien erreicht. Während Paetzold und Mitarbeiter die Verbindung [{BtBu} 4 ] mit einwertigen Borzentren durch reduktive Dehalogenierung von tBuBF 2 mit einer Na/K-Legierung herstellten, [15] [20] In, [21] Tl [22] ) sind tetramer, während [MCp*] (M Ga, [7] In [23] [23] bei [MCp B ] (dimer; M In, Tl) [25] sowie bei den polymeren Verbindungen [InCp], [24] [TlCp], [24] [TlCp*] [24] und [TlCp B ]. [25] Schnöckel et al postulierten, daû die verschiedenen monomeren Untereinheiten in diesen Verbindungen hauptsächlich durch van-der-Waals-Wechselwirkungen der äuûeren organischen Hülle und nicht durch M I -M I -Wechsel-wirkungen zusammengehalten werden.…”