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Abstract
The infrared response of single crystals of oxides relevant in the area of high-Tc superconductors is discussed. The consequence of Fano-type interference profiles is mentioned. The soft mode consisting of alternate tilts of octahedra which triggers the transition to the orthorhombic phase has little chance to play a direct role in the superconductivity mechanism. Conversely coupling of electrons of the Cooper pair via a highly-anharmonic oxygen breathing-type mode would be consistent with the weakness of the isotope effect.