Nitrogen-14 Nuclear Quadrupole Resonance Spectra of Metal Anthranilate Complexes

D. André d'avignon, Theodore L. Brown

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The 14N nuclear quadrupole resonance (NQR) spectra at 77 K have been obtained for solid divalent metal ion complexes ML2 of the anthranilate anion, L = CO2C6H4NH2, where M = Zn, Cd, Hg, Pd(II), Ca, Mg, Ba, Sr, Pb, and Sn(II), and for Hg(CO2C6H4NH2)Cl. The 14N NQR data permit the evaluation of the quadrupole coupling constant e2qzzQ/h and asymmetry parameter η, the two independent components of the electric field gradient tensor at nitrogen, in all the complexes. The NQR data can be interpreted in terms of a coordinated nitrogen model, on the basis of a modified Townes-Dailey analysis, to yield an estimate of the extent of withdrawal of electronic charge from nitrogen in the metal ion complexes, as compared with that of the protonated amino group as reference compound. The results show that electron withdrawal varies in the order Hg > Pd >> Sn > Pb > Cd ≈ Zn > Ca ≈ Mg > Sr > Ba. The results for the Hg(C-O2C6H4NH2)2 complex are anomalous, suggesting that the electronic environment about nitrogen is different in this complex than that in the others.

Original languageEnglish (US)
Pages (from-to)3041-3043
Number of pages3
JournalInorganic chemistry
Issue number8
StatePublished - 1982
Externally publishedYes


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