By Theilheimer W.
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AA I I .! | I t i I ,! I J "~. . . . 32 %etl Fig. 14 a, b. EPR and EI-EPR spectra of Cu(acacen) diluted into a Ni(acacen) • 1/2 H20 single crystal, a) EPR spectrum with two overlapping sites (I, II). b) EI-EPR spectrum of site II; (hfs of Cu and two 14N nuclei are resolved). (From Ref. 37) ENDOR-Induced EPR (EI-EPR) 31 Cu(acacen) diluted into Ni(acacen) • 1/2 H20 has been chosen as a typical example to demonstrate the separation of magnetically nonequivalent sites in a single crystal by proton EI-EPR.
The copper complex Cu(bipyam)2(C104)2 diluted into the corresponding Z n host crystal 1°5) shows an E N D O R spectrum which is due to four magnetically nonequivalent ENDOR with Circularly Polarized rf Fields (CP-ENDOR) b 43 _ 10 15 I I 20 MHz I Fig. 23a, b. ENDOR with circularly polarized rf fields (CP-ENDOR). Single crystal ENDOR spectra of Cu(bipyam)2 (C104)2 diluted into Zn(bipyam)2(CIO4)2; arbitrary orientation, temperature 20 K. a) Conventional ENDOR spectrum (linearly polarized rf field), b) CP-ENDOR spectrum: applied rf field right hand rotating.
An improvement in orientation selectivity is obtained by orienting planar paramagnetic compounds in nematic glasses (Sect. 1). Overlapping EPR or ENDOR spectra of transition metal complexes may be separated by using wide range ENDOR-induced EPR (Sect. 2) and DOUBLE ENDOR (Sect. 3), respectively. The technique of selective decoupling of nuclear dipole-dipole interactions (Sect. 4) and the generation of multiple quantum coherence by high rf fields (Sect. 5) facilitate the interpretation of ENDOR spectra in many cases.