217475-39-3Relevant academic research and scientific papers
Synthesis and characterization of novel dinuclear and cationic cyclobutadiene platinum complexes
Gerisch, Michael,Kirschbaum, Kristin,Bruhn, Clemens,Schmidt, Harry,Davies, Julian A.,Steinborn, Dirk
, p. 129 - 139 (2007/10/03)
Reactions of the cyclobutadiene platinum complexes [PtCl2(C4R4)] (R=Me 1a, R=Et 1b) with diphosphines Ph2PPPh2 (=-CC- (dppa), -CH2- (dppm), -(CH2)2- (dppe), -(CH2)3- (dppp), -(CH2)4- (dppb)) in a 2:1 molar ratio result in formation of novel binuclear cyclobutadiene platinum complexes [{PtCl2(C4R4)}2(μ-Ph 2PPPh2)] (R=Me 2, Et 3). In contrast, reactions in equimolar ratio lead to formation of cationic complexes with dppe, dppp and dppb [PtCl(C4R4){Ph2P(CH2) nPPh2}]Cl (n=2-4, R=Me 5, Et 6). Complexes 2, 3 and 5, 6 were fully characterized by microanalysis and by NMR and IR spectroscopies. Structural characterization of [{PtCl2(C4Me4)}2(μ-Ph 2PCH2PPh2)] (2b) reveals a piano-stool coordination at each platinum center defined by the η4-C4Me4 ligand, two Cl atoms and one P atom. The P-C-P angle of 131.0(4)° is larger than that expected for tetrahedral geometry. The X-ray structure of [PtCl(C4Me4){Ph2P(CH2) 3PPh2}]Cl·CH2Cl2 (5b·CH2Cl2) reveals a Pt atom coordinated by the η4-C4Me4 ligand, chloride and the two phosphorus donors in a piano-stool conformation. In the solid state, these cations are arranged to form channels with a diameter of 13.8 A in which solvent molecules (CH2Cl2) are embedded.
