Abstract
The triplet states of the complexes formed between the semidione 1,1,4,4-tetramethyltetralin-2,3-dione and Be2+, Mg2+, Ca2+, Sr2+, Ba2+, Zn2+ have been studied by e.s.r. spectroscopy in frozen solutions of 2-methyltetrahydrofuran. The e.s.r. spectrum of [Al(tmtd)3][tmtd = 1,1,4,4-tetramethyltetralin-2,3-dionate(1–)] has been attributed to a quartet state. The zero-field splitting parameters for the [M(tmtd)2] complexes have been obtained and compared with those calculated by electron dipole–dipole interaction for a number of conformations of the complexes. The conformations giving the best fit are reported. The discrepancy between experimental and calculated zero-field splitting parameters for the complexes of Sr2+ and Ba2+ has been explained by an additional spin–orbit contribution.
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