N. Guskos et al., Photoacoustic detection of d-d transitions and electronic structure of three polyamine copper complexes, J PHYS D, 33(20), 2000, pp. 2664-2668
The potential of photoacoustic spectroscopy to resolve the crystal field le
vels of Cu2+ ions in three polyamine copper complexes, aqua spermine copper
sulfate trihydrate [NH2(CH2)(3)NH(CH2)(4)NH(CH2)(3)NH2. Cu2+.H2O]. SO42-.
3H(2)O, norspermine copper sulfate trihydrate [NH2(CH2)(3)NH(CH2)(3)NH(CH2)
(3)NH2. Cu2+. SO42-]. 3H(2)O, and homospermine copper sulfate dihydrate [NH
2(CH2)(3)NH(CH2)(2)NH(CH2)(3)NH2. Cu2+. SO42-]. 2H(2)O, has been explored a
long with UV/VIS and electron paramagnetic resonance (EPR) spectroscopy. In
tense absorption is detected in the photoacoustic spectrum corresponding to
the d-d transition band weakly traced in the corresponding optical spectru
m. The observed fine structure photoacoustic lines are assigned to the indi
vidual d-d transitions of Cu2+ ions, which are further exploited to determi
ne the diverse metal-ligand interaction of the studied compound employing s
imple crystal field analysis.