cis-Dichloridobis(dimethoxyphenylphosphino)platinum(II)

Abstract

CommentThe title complex (I) is comparable to similar platinum dichloride complexes containing trimethoxy phosphite;[PtCl 2 (P(OMe) 3 ) 2 ] (Bao et al., 1987) and triphenyl phosphine [PtCl 2 (PPh 3 ) 2 ] (Fun et al., 2006). The central platinum atom in (I) can be seen to bear a closer resemblance to the triphenyl phosphine complex. These measurement are also similar when compared to the structure of the complex [PtCl 2 (P(OMe)Ph 2 ) 2 ] (Slawin et al., 2007) with the exception of the P-Pt-P bond angle which is unusually large.Experimental 1 g (2.67 mmol) of PtCl 2 (COD) was dissolved in the minimum volume of dichloromethane in a round-bottomed flask.To this, 0.840 ml (5.34 mmol) of dimethylphenylphosphonite was added. The solution was then stirred for 0.5 h at room temperature. The product was precipitated via slow diffusion of hexane and was then filtered off and dried under vacuum, [PtCl 2 (P(OMe) 2 Ph) 2 ] (1.86 mmol,ca 69%). 31 P-{ 1 H} NMR: δ 91.2 p.p.m. J{Pt-P} 4819 Hz. RefinementAll H atoms were included in calculated positions (C-H distances are 0.96 Å for methyl H atoms, 0.97 Å for methylene H atoms and 0.98 Å for methine H atoms) and were refined as riding atoms with U iso (H) = 1.2 U eq (parent atom, methylene and methine H atoms) or U iso (H) = 1.5 U eq (parent atom, methyl H atoms).

Correlating Pt–P bond lengths and Pt–P coupling constants

“…(2) cis-PtCl 2 (P(OMe) 2 Ph) 2 , 11 (3) cis-PtCl 2 (P(OMe)Ph 2 ) 2 12 and (4) cis-PtCl 2 (PPh 3 ) 2 ]. 13 The dibromide and diiodide analogues [( 5) cis-PtBr 2 (P(OMe) 3 ) 2 , (6) cis-PtBr 2 (P(OMe) 2 Ph) 2 , (7) cis-PtBr 2 (P(OMe)Ph 2 ) 2 , (8) cis-PtBr 2 (PPh 3 ) 2 , (9) cis-PtI 2 (P(OMe) 3 ) 2 , (10) cis-PtI 2 (P(OMe) 2 Ph) 2 , (11) cis-PtI 2 (P(OMe)Ph 2 ) 2 and ( 12) cis-PtI 2 (PPh 3 ) 2 ] were characterised in this work.…”

The Synthesis and Structure of Hexakis(dimethylphenylphosphonite)ruthenium(II) bis[tetraphenylborate(–1)]

“…[16] Mean P-O and O-C distances are 1.596(3) and 1.450(5) Å and are normal. [17] The mean Ru-P distance in 3 (2.3714 Å) ( Table 1) is signicantly longer than the average Ru-P bond length of 2.31 Å reported for 14 sterically crowded complexes containing trans-[Ru II (dmpe) 2 ] moieties [4,18] suggesting some steric crowding in 3. [2,4] In solution, the hydrazone groups probably become destabilized due to the dominant steric interactions of the P(OMe) 2 Ph ligands, which explains the formation of the homoleptic complex 3 in prefer-ence to the hydrazone.…”