142233-32-7Relevant academic research and scientific papers
Synthesis and characterisation of 2,2-bis(hydroxymethyl)-1,3-diselenolato metal(II) complexes bearing various phosphanes
Niksch, Tobias,Goerls, Helmar,Friedrich, Manfred,Oilunkaniemi, Raija,Laitinen, Risto,Weigand, Wolfgang
, p. 74 - 94 (2010/04/01)
An improved synthesis of 4,4-bis(hydroxymethyl)-1,2-diselenolane and the complexation properties of the corresponding diselenolato dianion to group-10 metals are reported. We describe an efficient and straightforward procedure that bypasses the isolation of the malodorous and airsensitive diselenol and starts with the diselenide appropriate group-10 metal complex bearing phosphane and chlorido ligands. A series of complexes with various monoand bidentate phosphanes is prepared and characterised by multinuclear NMR spectroscopy, mass spectrometry, and elemental analysis. Furthermore, the structure of most complexes is studied by single-crystal X-ray diffraction to establish their supramolecular arrangement in the solid state. Consequently, several group-10 metal complexes with P-M-P angles (bite angles) in the range from 71-108° are investigated. The use of the sterically demanding bridging phosphane 4,5-bis(diphenylphosphanyl)-9,9-dimethylxanthene, which exhibits a large bite angle yields a mixture of a di- and trinuclear complex. While the platinum-containing complexes are proven to be rather stable, the palladium and nickel analogues tend to decompose. Especially, the nickel complexes were found to be sensitive against: oxidation. This circumstance leads to the formation of the so far unknown 1,8-bis(diphenylphosphanyl)naphthalene monooxide, the formation and structure of which could be confirmed from NMR spectroscopic data and single-crystal X-ray diffraction.
Platinum(II) Co-ordination Chemistry of Bis(diphenylphosphino)amine
Browning, C. Scott,Farrar, David H.
, p. 521 - 530 (2007/10/02)
A spectroscopic and structural examination of the platinum(II) co-ordination chemistry of bis(diphenylphosphino)amine (dppa) and bis(diphenylphosphino)methylamine (dppma) has been made.The complexes , , , , (2+) and (2+) as the chloride, iodide and tetrafluoroborate salts, , trans- and have been prepared.The solid-state structures of 2*MeCN, 2 and trans- have been determined by X-ray crystallography.The crystallographic examination permits a critical evaluation of the nature of the strain in the four-membered rings formed by ligand chelation to a transition-metal centre.Structural and theoretical data suggest that bis(diphenylphosphino)amine chelate complexes should be more strained than the corresponding bis(diphenylphosphino)methane (dppm) complexes.The preference of Pt(II) for binding to dppa rather than dppm implies the formation of a stronger Pt-P bond in complexes of the former ligand.
