Nonradiative Processes in Rare‐Earth Hydrazone Complexes Studied by Photoacoustic Spectroscopy

Photoacoustic spectrum of a new, 12-fold-coordinated Ho(III) hydrazone complex

“…Some of the rare earth(III) ions have very high magnetic moment and their complexes could be very useful as a new class of potential magnetic resonance imaging contrast agents for NMR tomography [4]. We have previously reported the spectroscopic characteristics of holmium(III) hydrazone complex [Ho(PicBH) 2 (NO 3 ) 2 ] with a coordination number of 10 [5][6][7][8]. Organic rare earth(III) and copper(II) complexes have often been studied with photoacoustic spectroscopy (PAS), as this technique provides important additional information about dynamical processes such as the intermolecular energy transfer or the heating processes correlated with the photon-electron-phonon interactions [5][6][7][8][9][10][11][12][13][14].…”

“…We have previously reported the spectroscopic characteristics of holmium(III) hydrazone complex [Ho(PicBH) 2 (NO 3 ) 2 ] with a coordination number of 10 [5][6][7][8]. Organic rare earth(III) and copper(II) complexes have often been studied with photoacoustic spectroscopy (PAS), as this technique provides important additional information about dynamical processes such as the intermolecular energy transfer or the heating processes correlated with the photon-electron-phonon interactions [5][6][7][8][9][10][11][12][13][14]. The PAS of the new hydrazone rare earth(III) complexes of neodymium(III) and erbium(III) has shown the PA spectra of the f-f type more than twice as intense as those usually observed [7,14].…”