Title of article :
A series of di-nuclear rhodium(I) complexes with trialkylstibines as bridging ligands
Author/Authors :
Werner، Helmut نويسنده , , Pechmann، Thomas نويسنده , , Brandt، Carsten D. نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
-1494
From page :
1495
To page :
0
Abstract :
Metathetical reactions of [Rh2Cl2(mu-CPh2)2(mu-SbiPr3)]1 with NaBr and NaI afforded the corresponding di-nuclear complexes [Rh2X2(mu-CPh2)2(muSbiPr3)](X = Br 2, I 3) in practically quantitative yields. Analogous displacement reactions of 1 with equimolar amounts of the sodium salts of acetylacetone (acacH), trifluoracetylacetone (acac-f3-H) and dipivaloylmethane (dpmH) led to the formation of the unsymmetrical rhodium(I) compounds [Rh2(X)Cl(mu-CPh2)2(mu-SbiPr3)](X = acac 4, acac-f35, dpm 6). From 1 and excess of Na(acac) and Na(dpm), the symmetrical complexes [Rh2X2(mu-CPh2)2(mu-SbiPr3)](X = acac 7, dpm 8) were formed. Treatment of 7 with acetic acid and trifluoracetic acid in the molar ratio of 1 1 gave the unsymmetrical compounds [Rh2X(acac)(mu-CPh2)2(mu-SbiPr3)](X = CF3CO29, CH3CO210), while with an excess of CR3CO2H the symmetrical complexes [Rh2(2-O2CR3)2(mu-CPh2)2(mu-SbiPr3)](R = F 11, H 12) were obtained. The X-ray crystal structure analysis of 12 revealed that analogously to 1 the stibine ligand occupies a symmetrical bridging position. The reactions of 1, 4 and 7 with SbEt3 and Sb(CH2Ph)3 led to bridge-ligand exchange and gave the di-nuclear compounds [Rh2(acac)Cl(µ-CPh2)2(µ-SbEt3)]13 and [Rh2X(X)(mu-CPh2)2{mu-Sb(CH2Ph)3}](X = X= Cl 14, X = Cl, X= acac 15, X = X= acac 16) without cleavage of the [Rh2(µ-CPh2)2] core fragment.
Journal title :
DALTON TRANSACTIONS
Serial Year :
2003
Journal title :
DALTON TRANSACTIONS
Record number :
64177
Link To Document :
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