A supramolecular neutral complex was isolated in the solid state in the reaction of calix[4]-resorcinol having nitrogen-containing substituents [CH2N(CH3)2] on the upper rim of the molecule with RhCl3·3H2O in acetone. The complex, in addition to the calixarene structure and the rhodium-containing fragment, includes the dioxygen molecules bound to the rhodium ion [Rh~(+3)(O2)]. The compound was characterized by IR, Raman, ~1H NMR, ESR and electron spectroscopy, and by conductivity. The composition was confirmed by elemental analysis, XRD study and derivatography. The electronic structure of the complex was revealed by analysis of electron spin resonance spectrum and electron absorption spectrum.
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