Metal benzoylpivaloylmethanates. Part II. 1,4-dioxane adducts of copper(II) chelates

Abstract

l:lDioxane adducts of copper(ll) chelates with pata-sul~stituted benzoylpivaloylmethanes have been synthesized and their u.v., vis., i.r., mass, e.p.r, spectra as well as their magnetic moments and thermal stabilities investigated. Powdered samples of undiluted magnetically adducts were found to give well resolved e.p.r, spectra; the (S = 1) gll signal being split into nine lines. Magnetic susceptibilities measured down to 4 K did not reveal exchange interactions. The uncommon structure of the e.p.r, spectra is believed to be due to the dimeric structure of the adduct in which an interion dipolar zero-field splitting of the triplet state occurs. The Cu-Cu distance estimated from the e.p.r. Ddd parameter is found to be 7.4 A.