M. Ates

(Me3Sn)2SbSb(SnMe3)2, 1∞-verknüpfte SbSb-Hanteln in einem thermochromen Distiban mit Schweratomgerüst

Abstract Single crystals of the thermochromic distibane (Me 3 Sn) 4 Sb 2 ( 1 ) are obtained by irradiation of (Me 3 Sn) 3 Sb with sunlight. The crystal structure of 1 is reported as linear chains of distibane molecules in trans conformation with Sb ⋯ Sb contacts of 389 ppm. Diffuse reflexion spectra of 1 in the solid state and in solution demonstrate thermochromic effect. The Raman spectrum of solid 1 exhibits strong absorption at 162 cm −1 for ν(Sb 2 ).

Kristallstruktur, thermische Ausdehnung und Farbwechsel von (Me3Ge)2Sb-Sb(GeMe3)2 und anderen Distibanen

Abstract Single crystals of the distibanes (Me 3 M) 4 Sb 2 ( 1 : M = Si, 2 : M = Ge) are obtained by the oxidation in air of (Me 3 M) 3 Sb. The crystal structure of 2 is reported. 2 forms linear chains of distibane molecules in trans conformation with Sb ··· Sb contacts of 386 pm at −110°C and 390 pm at 22°C. The thermal expansion of crystals of 2 and (Me 3 Sn) 4 Sb 2 ( 3 ) has been determined. UV-VIS spectra of 1 – 3 , Me 4 Sb 2 ( 4 ), Et 4 Sb 2 ( 5 ), and Ph 4 Sb 2 ( 6 ) in different phases have been recorded. The spectra of 1 – 5 are consistent with the visible colour changes.

Electrochemical studies on organometallics compounds: XXXVIII. Electrosynthesis of ethyl-, propyl- and butyl-antimony

Abstract Two-electron reduction of RSbBr 2 ( 1 : R  C 2 H 5 ; 2 : R  n-C 3 H 7 ; 3 : R  n-C 4 H 9 ) in tetrahydrofurans in presence of Bu 4 NPF 6 followed by extraction with toluene has given the cyclic and polymeric organoantimony(I) compounds (RSb) n (n = 4, 5) and (RSb) x ( x ⪢ 5), which have been identified by 1 H NMR and mass spectroscopy. Mechanistic aspects are discussed.

NEUE DARSTELLUNG, SCHWEFELINSERTION UND HYDROLYSE DER PHENYL(TRIMETHYLSILYL)STIBANE

Abstract Reaction of Mg and Me3,SbCl with Ph2,SbCl or PhSbCl2, gives Ph2,SbSiMe3, (1) or PhSb(SiMe3)2, (2). Sulfur inserts into 1 to give Ph2,SbSSiMe3, (3). Products of action of S8 on 2 are 3, PhSb(SSiMe3,)2, (4), (Me3,Si)2,S, and Sb2S3. Hydrolysis or methanolysis of 1, or 2 give Ph2,SbH2 (5), or PhSbH2, (6) respectively. Die Reaktion von Mg und Me3SiCl mit Ph2SbCl oder PhSbCl2 fuhrt zu Ph2,SbSiMe3 (1) oder PhSb(SiMe3,)2, (2). Schwefel insertiert in 1 unter Bildung von Ph2,SbSSiMe3, (3). Produkte der Reaktion von S8, mit 2 sind 3, PhSb(SSiMe3,)2, (4), (Me3,Si)2,S und Sb2S3. Durch Hydrolyse oder Methanolyse von 1 oder 2 entstehen Ph2SbH (5) oder PhSbH2 (6).

Electrochemical studies on organometallic compounds: XXXVI. New aspects of the electroreduction of (Ph2Sb)2O, (Ph2Sb)2, Ph2Sb(nBu), and Ph3Sb

Abstract Electroreduction of (Ph 2 Sb) 2 O ( 1 ) in THF gives Ph 2 Sb − , which can also be obtained by uptake of two electrons on (Ph 2 Sb) 2 ( 2 ). Ph 2 Sb − reacts with the supporting salt ( n Bu 4 NPF 6 ) to yield tributylamine and Ph 2 Sb( n Bu) ( 3 ). The electro-reduction of 3 and Ph 3 Sb ( 4 ) gives also the anion Ph 2 Sb − . There is a considerable influence of the electrode surface on the redox properties of 1–4 . Mechanistic aspects are discussed.

Exchange reactions of distibines

Abstract Distibines of the type R 2 SbSbR′ 2 with R = CH 3 , R′ = C 2 H 5 ( 1 ), R = CH 3 , R′= n -C 3 H 7 ( 2 ), R = CH 3 , R′= C 6 H 5 ( 3 ), R = C 2 H 5 , R′= C 6 H 5 ( 4 ), R = n -C 3 H 7 , R′ = C 6 H 5 ( 5 ), and R = CH 3 , R′ = 2,4,6-(CH 3 ) 2 C 6 H 2 ( 6 ) are formed in equilibria by exchange reactions of the respective distibines of the type R 4 Sb 2 and R′ 4 Sb 2 .

Electrochemical studies on organometallic compounds. XXXIV, Redox properties of tetraphenyldistibane

Abstract The uptake of two electrons by (Ph 2 Sb) 2 , 1 , yields Ph 2 Sb − , 2 . Two-electron oxidation of 1 gives the cationic species Ph 2 Sb + , 3 . At room temperature 3 is reduced in two steps to 2 via the intermediate Ph 2 Sb, 4 .