92471-73-3Relevant articles and documents
Coulombic inter-ligand repulsion effects on the Pt(ii) coordination chemistry of oligocationic, ammonium-functionalized triarylphosphines
Snelders, Dennis J. M.,Siegler, Maxime A.,Von Chrzanowski, Lars S.,Spek, Anthony L.,Van Koten, Gerard,Gebbink, Robertus J. M. Klein
, p. 2588 - 2600 (2011/05/04)
The Pt(ii) coordination chemistry of oligocationic ammoniomethyl- and neutral aminomethyl-substituted triarylphosphines (L) is described. Complexes of the type PtX2(L)2 (X = Cl, I) have been isolated and characterized. For the hexa-meta-ammoniomethyl-substituted ligands [1] 6+ and [2]6+, two ligands always occupy a trans-configuration with respect to each other in complexes of the type PtX 2(L)2, while for the tri-para-ammoniomethyl-substituted ligand [7]3+, the trans/cis ratio is dependent on the ionic strength of the solution. This behaviour was not observed for the neutral aminomethyl-substituted ligands. In the crystal structure of trans-[PtI 2(1)2]I12, the geometrical parameters of the phosphine ligand [1]6+ are very similar to those found in the analogous complex of the benchmark ligand PPh3, i.e. trans-PtI 2(PPh3)2, indicating that no significant increase in the steric congestion is present in the complex. Instead, the coordination chemistry of this class of phosphine ligands is dominated by repulsive Coulombic inter-ligand interactions.
Probing the bonding of phosphines and phosphites to platinum by NMR. Correlations of 1J(PtP) and Hammett substituent constants for phosphites and phosphines coordinated to platinum(II) and platinum(0)
Cobley, Christopher J.,Pringle, Paul G.
, p. 107 - 115 (2008/10/08)
The values of 1J(PtP) have been measured for the platinum(II) complexes cis-[PtCl2L2] and cis-[PtMeClL2] and the platinum(0) complexes [PtL(norbornene)2] and [PtL2(norbornene)] where L = P(C6H4Z-4)3 and [PtL2(norbornene)], [PtL3] and [PtL4] where L = P(OC6H4Z-4)3 and Z = NMe2, OMe, Me, H, Cl, CF3. When 1J(PtP) is plotted against the Hammett substituent constant two distinct trends emerge: for platinum(II) the more electron-withdrawing the substituent the smaller the 1J(PtP), while for platinum(0) the more electron-withdrawing the substituent the larger the 1J(PtP). These observations are rationalised in terms of the σ and π-bonding components of the platinum-phosphorus bonds.