Chromophore in binuklearen ringförmigen Gold(I)‐Komplexen

Abstract

Abstract Annular compounds containing two PAuP‐entities are prepared by reaction of (trialkylphosphine)gold (I) halogenides with diphosphines. With bis (dimethyl‐phosphino)methane (DMPM), 1,2‐bis(dimethylphosphino)ethane (DMPE) and 1,3‐bis(dimethylphosphino)propane (DMPP) we obtained the following 8‐, 10‐and 12‐membered annular binuclear complexes: [Au(DMPM)] 2 Cl 2 H 2 O, [Au(DMPM)] 2 (SbF 6 ) 2 , [Au(DMPE)] 2 Cl 2 2H 2 O, [Au(DMPE)] 2 (SbF 6 ) 2 , [Au‐(DMPP)] 2 Cl 2 and [Au(DMPP)] 2 (SbF 6 ) 2 as identified by conductivity measurements, 1 H‐ and 31 P‐NMR. spectra and extinction curves. Their absorption spectra differ from those of the isolated linear PAuP‐complexes mainly by a very strong band at low energy which is absent in the latter. There is a strong interaction between the PAuP‐entities only in certain excited electronic states and an understanding of all transitions is only possible, if both chromophores PAuP and (PAuP) 2 are taken as a basis of interpretation. Bands of the same spectrum belong apparently to two different electronic systems. The absorption spectra of isolated linear and annular ylide‐complexes containing one and two CAuC‐entities, respectively, show quite the same behaviour.