Mercury(II) complexes of new bidentate phosphorus ylides: synthesis, spectra and crystal structures

✍ Scribed by Sabounchei, Seyyed Javad; Panahimehr, Mohammad; Khavasi, Hamid Reza; Bagherjeri, Fateme Akhlaghi; Boscovic, Collete

• Book ID: 121744354
• Publisher: Versita
• Year: 2014
• Tongue: English
• Weight: 290 KB
• Volume: 68
• Category: Article
• ISSN: 0366-6352
• DOI: 10.2478/s11696-013-0487-5

✦ Synopsis

The reaction of dppm (1,1-bis(diphenylphosphino)methane) with 2-bromo-4-phenylacetophenone and benzyl bromoacetate in chloroform produces new phosphonium salts, [Ph2PCH2PPh2CH2C(O) C6H4Ph]Br (I ) and [Ph2PCH2PPh2CH2COOCH2Ph]Br (II ). By allowing the phosphonium salts to react with the appropriate base, the bidentate phosphorus ylides, Ph2PCH2PPh2--C(H)C(O)C6 H4Ph (III ) and Ph2PCH2PPh2--C(H)C(O)OCH2Ph (IV ), were obtained. The reaction of these ligands with mercury(II) halides in dry methanol led to the formation of the mononuclear complexes {HgX2[(Ph2PCH2PPh2C(H)C(O)C6H4Ph)]} (X = Cl (V ); X = Br (VI ); X = I (VII )) and {HgX2[(Ph2PCH2PPh2C(H)COOCH2Ph)]} (X = Cl (VIII ); X = Br (IX ); X = I (X )). The FTIR and 1 H, 31 P and 13 C NMR spectra were studied. The structure of compound III was unequivocally determined by the single-crystal X-ray diffraction technique. Single-crystal X-ray analysis of the {HgBr2[(Ph2PCH2PPh2C(H)C(O)C6H4Me)]} complex (XI ) revealed the presence of a mononuclear complex containing the Hg atom in a distorted tetrahedral environment. In all complexes, the ylides referred to above were coordinated through the ylidic carbon and the phosphine atom.