Organometallic gold(I)–nickel(II)–aryldiethynyl (–C≡C(Ar)C≡C–) phosphine complexes: synthesis and multinuclear n.m.r. study

Silver triflate [AgOTf] assisted de-bromination gives [Ni(dppm/dppe/(PPh3)2)(OTf)2], which on reaction with aryldiethynyls and gold(I) phosphines in CH2Cl2 medium, by the self assembly technique, leads to [{Ni(dppm/dppe/(PPh3)2}{(1,4-AB)Au(PPh3)}2] [{Ni4(dppm/dppe/(PPh3)2)4(1,4AB)4}] [dppm/dppe = diphenyl phosphino-methane (1), -ethane (2), where OSO2CF3 is the triflate anion]. The maximum molecular peak of the corresponding molecule is observed in the ESI mass spectrum. I.r. spectra of the complexes show –C=C– and –C=N–, as well as phosphine stretching. The 1H-n.m.r. spectra as well as 31P(1H)-n.m.r. suggest solution stereochemistry, proton movement, phosphorus proton interaction. Considering all the moities there are a lot of carbon atoms in the molecule reflected by the 13C-n.m.r. spectrum. In the 1H–1H-COSY spectrum of the present complexes and contour peaks in the 1H–13C-HMQC spectrum, assign the solution structure and stereo-retentive transformation in each step.