THE CRYSTAL STRUCTURE OF BIS(η5-CYCLOPENTADIENYLTRICARBONYLTUNGSTEN) TIN DICHLORIDE, [Cp(CO)3W]2SnCl2

Syntheses and Molecular Structures of [RSn{W(CO)3Cp}2][W(CO)3Cp], [RSn{W(CO)3Cp}Cl2], and [RSn{W(CO)3Cp}Cr(CO)5] (R = [4-t-Bu-2,6-{P(O)(OR′)2}2C6H2], R′ = Et,i-Pr). Autoionization Induced by Intramolecular P═O→Sn Coordination

“…The Sn(1)–W(1) (2.8557(7) Å) and Sn(1)–W(2) (2.8391(8) Å) distances are almost equal and comparable with the Sn–W distances reported for the Sn(IV) compounds [{2-(Me 2 NCH 2 )­C 6 H 4 } 2 ­Sn(Cl)­W(CO) 3 Cp] (2.8203(3) Å), t -Bu{Cp(CO) 3 W}­Sn(OSiPh 2 ) 2 O (2.7790(5)/2.7614(5) Å), t -Bu{Cp(CO) 3 W}SnCl 2 (2.7519(6) Å), {Cp(CO) 3 W} 2 ­Sn(OSiMe 3 ) 2 (2.8267(5)/2.7983(5) Å), and {Cp(CO) 3 W} 2 ­SnCl 2 (2.7965(5)/2.7854(5) Å) …”

“…A 119 Sn NMR spectrum in THF/D 2 O (capillary) revealed a triplet resonance at δ 407 ( J ( 119 Sn– 31 P) = 127 Hz) that is considerably high-frequency shifted as compared to the isoelectronic cation of the ditungsten-substituted organotin salt 2 , the benzoxphosphastannole derivative 3 , the monoorganotin derivative 4 containing a six-ccordinate tin center, and the diorganotin compound [{2-(Me 2 NCH 2 )C 6 H 4 } 2 Sn(Cl)W(CO) 3 Cp] (δ −55), containing a five-coordinate tin center. The ditungsten-substituted tin derivatives [Cp(CO) 3 W] 2 Sn(cat) (cat: 3,6-di- tert -butylcatecholate) (δ 331), [Cp(CO) 3 W] 2 ­SnPh 2 (δ −19, 1 J ( 119 Sn– 183 W) 225 Hz), and {Cp(CO) 3 W} 2 ­Sn(OSiMe 3 ) 2 (δ −44 ( 1 J ( 119 Sn– 183 W) 419 Hz), all containing tetracoordinated tin centers but different substituents, show rather different 119 Sn chemical shifts. A comprehensive review on 119 Sn NMR spectra of transition metal stannylene complexes is given by Augustin and Ehses…”

Neue heterometallische Organoderivate von Haupt‐ und Nebengruppenelementen mit dem 2‐(Dimethylaminomethyl)ferrocenyl(1‐)‐Liganden FcN(1‐) und der N‐[2‐N′, N′‐(Dimethyl‐aminoethyl)‐N‐methyl‐aminoethyl]ferrocenyl(1‐)‐Gruppierung FcN, N(1‐)

“…Das in der eigenen Arbeitsgruppe synthetisierte homoleptische Thalliumorganyl [(FcN) 3 Tl] (16) ist ein "gemischter" thallium(III)-organischer Chelatkomplex mit einer chelatgebundenen und zwei nicht chelatisierenden FcN(1-)-Gruppierungen. Sowohl über 16 als auch über den heteroleptischen Chelatkomplex [(FcN) 2 (20) synthetisieren und auch strukturell aufklären [12].…”