18497-53-5Relevant academic research and scientific papers
Main group compounds as amphoteric ligands to transition metals. Synthesis and molecular structure of Cr(CO)5[PPh2CH2Ga(CH2CMe 3)2·NMe3]
Beachley Jr.,Banks, Michael A.,Kopasz, John P.,Rogers, Robin D.
, p. 5170 - 5174 (2008/10/08)
The reactivities of the group 13 compounds, R2MCH2PPh2 and R2MPPh2, as amphoteric ligands to transition metals have been investigated. The ligands R2MCH2PPh2 (R = CH2-CMe3, CH2SiMe3; M = Ga, In) reacted readily with Cr(CO)5NMe3 in benzene solution to form Cr(CO)5[PPh2CH2MR2·NMe 3], whereas for ligands of the type R2MPPh2 (R = CH2CMe3, CH2SiMe3; M = Al, Ga, In), only the two aluminum compounds and (Me3CCH2)2GaPPh2 formed isolable products of the type Cr(CO)5[PPh2MR2·NMe3]. However, the gallium and indium ligands with (trimethylsilyl)methyl substituents (Me3SiCH2)2MPPh2 reacted with NEt4Mr(CO)5Cl (MT = Cr, Mo, W) to form products of the type NEt4MT(CO)5[PPh2MR2Cl]. All new compounds were characterized by their physical properties, C and H analyses, and 1H and 31P NMR and IR spectral properties. The identity of NEt4Cr(CO)5[PPh2In(CH2SiMe 3)2-Cl] was further confirmed by the subsequent identification of products from reactions with anhydrous HCl and with MeI. In addition, Cr(CO)5[PPh2CH2Ga(CH2CMe 3)2·NMe3] was characterized by an X-ray structural study.
1H, 13C and 31P NMR studies of some (C6H5)3-nPRn and (C6H5)3-nPRnCr(CO)5 (n=0-3; R=H, CH3, C2H5, i-C3H7, t-C4H9) derivatives
Vincent, E.,Verdonck, L.,Kelen, G. P. van der
, p. 699 - 704 (2007/10/02)
The 31P chemical shift of the (C6H5)3-nPRn and (C6H5)3-nPRnCr(CO)5 (n=0-3; R=H, CH3, C2H5, i-C3H7, t-C4H9) derivatives is dominated by the steric effect.A small inductive effect is also operative but there are no indications of notable (dCrdp)? back-bonding.The 13C chemical shift of the phenyl carbon atons indicates that (pring-dp)? electron delocalization is unimportant.The 13C chemical shift of the carbonyl atoms, which is mainly governed by the mean excitation energy, confirms the conclusion that there are no notable changes in (dCrdp)? back-bonding in this series of compounds.
SYNTHESIS AND INFRARED STUDY OF (C6H5)nPX3-nCr(CO)5 (X=Cl, Br, I, H; n=0-3) AND (C6H5)2PRCr(CO)5 (R=METHYL, ETHYL, i-PROPYL, t-BUTYL) COMPOUNDS
Vincent, E.,Verdonck, L.,Kelen, G. P. van der
, p. 33 - 40 (2007/10/02)
A method for the preparation of (C6H5)nPX3-nCr(CO)5 complexes in the crystalline state is described.The carbon-oxygen stretching vibration, νCO(A1 eq.), of the complexes with X=Cl, Br, I is mainly determined by the inductive effect of the (C6H5)nPX3-n group.For X=H, the νCO band is defined by the concomitant influence of the ?, ? and steric effects.
