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Cyclic oxaalkyl diamide of o-phthalic acid (CPhDA) has been obtained and its ability to form complexes with calcium cation has been studied by X-ray, ESI MS, 1 H and 13 C NMR, FT-IR and PM5 semiempirical methods. The ESI MS measurements have proved that in gas phase the 3:1, 2:1 and 1:1 CPhDA–Ca 2+ as well as 3:1 and 2:1 CPhDA–Ca(ClO 4 ) + complexes are formed...
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