Synthesis and reactivity of phosphonato, phosphato and arsonato complexes of platinum(II)

Platinum(II) phosphonate complexes derived from endo-8-camphanylphosphonic acid

“…The magnitudes of the 1 J PtP coupling constants, which lie between 3654 and 3843 Hz, are comparable with those of the methyl-and phenyl-phosphonate analogues, [7] and are consistent with phosphine ligands trans to low trans-influence oxygen donor groups. [24] Thus signal.…”

“…The 31 P{ 1 H} NMR data of the platinum-phosphonate complexes 2 and 4, Table 2, are more complicated than the analogous methyl-and phenyl-phosphonate complexes [Pt(O 3 PR)L 2 ] (R = Me or Ph; L = PPh 3 or L 2 = dppe) that have been previously reported. [7] In the methyl-and phenyl-phosphonates the phosphine phosphorus atoms are equivalent, giving a single peak with 1 JPtP coupling. In contrast, the donor phosphorus atoms (P x and P y , refer Table 2) of the camphanyl analogues 2 and 4 are inequivalent, coupling to each other to produce two doublets in the 31 P{ 1 H} NMR spectra.…”

C–H activation of diphenylphosphinoaryl-derivatives with dimethyltetrakis(trimethylphosphine)iron(II)

“…Similar cyclometalation reactions by C-H activation in ortho position of benzyldiphenylphosphines have been previously described with Au [11], Ni [12], Co [13], Pt [14], and Pd [15]. Products with related pincer type ligands incorporating two benzylic phosphine anchoring groups have been shown in other laboratories to attain higher thermal stabilities [16].…”

Platinum organometallic compounds: classification and analysis of crystallographic and structural data. Part I. Monomeric Pt(0) and partly of Pt(II) with PtC4, PtA3B and PtC2A2 chromophores

“…In a yellow complex (Bennet et al 1978 ), a pair of o -C 6 H 4 PPh 2 monoanions form two four-membered metallocycles with a mean C − Pt − P bite angle of 68.73(7) ° . In another seven derivatives (Cheney et al 1973, Porzio 1980, Abicht et al 1982, Braunstein et al 1989, Kemmitt et al 1992, Gaw et al 1999 ), a pair of hetero-bidentate ligands create two fi vemembered metallocycles with a mean C − Pt − P bite angle of 81.6 ° (range 79 -84.1 ° ). A pair of CH 2 PPh 2 CH 2 PPh 2 ligands form a pair of fi ve-membered metallocycles (-CPCP-), with a mean C − Pt − P bite angle of 90.6 ° (Ghaffar et al 1996 ).…”

“…The mean cis -and trans -C − Pt − P bond angles are 103.5 ° (range 97.5 -117.3 ° ) and 152.7 ° (range 142.2 -160.9 ° ). There are ten derivatives (Cheney et al 1973, Bennet et al 1978, Porzio 1980, Abicht et al 1982, Braunstein et al 1989, Kemmitt et al 1992, Ghaffar et al 1996, van der Boom et al 1996, Gaw et al 1999 in which a pair of hetero-bidentate − C,P donor ligands build up a distorted square planar (PtC 2 P 2 ) geometry about each Pt(II) atom. In a yellow complex (Bennet et al 1978 ), a pair of o -C 6 H 4 PPh 2 monoanions form two four-membered metallocycles with a mean C − Pt − P bite angle of 68.73(7) ° .…”