Abstract: Abstract Resonance Raman spectra of the linear-chain, mixed-valence, halogen-bridged complexes [Pt(pn) 2 ] [Pt(pn) 2 X 2 ] (ClO 4 ) 4 , where X = Cl or Br, and [Pd(pn) 2 ] [Pd(pn) 2 Br 2 ] (ClO 4 ) 4 have been obtained over the range of excitation wavelengths 457.9 to 647.1 nm. Of particular interest is the symmetric metal—halogen stretch, ν 1 , which has several components. The relative intensities of these components change with variation of the wavenumber of excitation within the intervalence electronic absorption. This effect and the ori...
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