81. Free organic radicals in the gaseous state. Part IV. Synthesis of antimony cacodyl and related substances by the use of free methyl and free ethyl

Notizen: p-Tolytelluro-dimethylstiban - ein Molekül mit Tellur-Antimon-Bindung / p-Tolytelluro-dimethylstibane. A Molecule with the Tellurium-Antimony-Bond

“…Tetramethyldistiban (1) zeigt ähnlich wie einige Ditelluride und elementares Iod in Lösung und in flüssiger Phase eine andere Farbe als in festem Zustand, was auf zwischenmolekulare Wechselwirkungen im Kristall hindeutet [1][2][3]. In diesem Zusammenhang interessierte uns das Verhalten von Molekülen, die eine Sb-Te-Bindung als Chromophor enthalten.…”

Ligand Effects on the Electronic Structure of Heteroleptic Antimony‐Centered Radicals

“…Neutral stibanyl radicals R 2 Sb . were first postulated by Paneth as intermediates in the reaction of elemental Sb with methyl radicals, and later found in chemical vapor deposition (CVD) processes . Unfortunately, their electronic stabilization and isolation in the solid state remains challenging, and only a few persistent or stable Sb‐centered radicals have been reported (Figure ).…”

Organometallic Compounds with Homonuclear Bonds between Bismuth Atoms, 70 Years after Paneth' Report on the Violet Dimethyl Bismuth Compound

“…Organobismuth compounds with homonuclear bonds are known since 1934, when Paneth reported that the reaction between methyl radicals and a heated bismuth mirror gives a trace of a violet solid which melts to a yellow liquid prior to decomposition. He assigned the violet compound the structure of tetramethyl dibismuthane, (CH 3 ) 2 Bi-Bi(CH 3 ) 2 , the first organometallic compound with a bismuth-bismuth single bond [1,2]. After this pioneering work on a diorgano bismuth(II) compound little progress was notable for almost fifty years until the groups of Ashe [3], Becker [4], Calderazzo [5], and our group [6] almost simultaneously developed efficient syntheses for tetraalkyl and tetraaryldibismuthanes.…”

“…The first organobismuth(I) compounds, the dibismuthene RBiϭBiR, R ϭ 2,4,6-[(Me 3 Si) 2 CH] 3 C 6 H 2 [7] and the cyclobismuthanes (RBi) n (n ϭ 3, 4; R ϭ (Me 3 Si) 2 CH [8]) were reported in 1997 and 1998, respectively. Recently also a bicyclic compound, R 5 Bi 8 (R ϭ (Me 3 Si) 3 Sn [9]) was described.…”