Abstract
As a continuation of previous work carried out on the electron spin resonance characteristic of Cu(II) Linde Y zeolite, measurements were made in both X-(9.5 GHz) band and in Q-(35 GHz) band at room, liquid-nitrogen and liquid-helium temperatures. Deuterated samples were measured to cut down the influence of dipole-dipole broadening of the Cu(II) signal by the protons of the ligand water molecules. Solid state effect measurements at low temperatures were used to supplement the resolution of the Cu(II) complex spectrum. Evidence for the existence of two sites for Cu(II) in the lattice was examined critically. The presence of copper(II) clusters in more concentrated Cu(II) samples, particularly after heat treatment, was substantiated. The influence of gases adsorbed or reacting with the Cu(II) zeolite was investigated.
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