The lanthanide complexes of di(4‐hydroxycoumarinyl‐3)—acetic acid (M2L3 · 10H2O) have been synthesized and characterized by IR, HNMR, electronic spectra, thermoanalysis and molar conductance. The metallic ions substituted two hydrogen atoms of carboxyl and hydroxy groups and are also bonded to the oxygen atom of the carbonyl group of the benzopyranyl ring. Electronic spectra showed that the lanthanide—ligand bond had some covalent character and the involvement of 4f orbital was very small. The light lanthanide complexes revealed the nice anticoagulant action especially the lanthanum coordination compound.
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Deng et al. (1992) studied this question.
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