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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 16, Number 12
BKCSDE 16(12)
December 20, 1995

Title	1H NMR Study of Pyridine-Type Ligands Coordinated to the Paramagnetic [Ni3(PW9O34)2]12- Anion
Author	Han Young Woo, Ji Young Kim, Hyunsoo So*
Keywords
Abstract	1H NMR spectra of pyridine, α-, β-, and γ -picoline coordinated to the paramagnetic heteropolyanion [Ni3(PW9O34)2]12- (P2Ni3) are reported. NMR lines are assigned to [Ni3(ptl)n(PW9O34)2]12- (n=1, 2 or 3; ptl=pyridine-type ligand) on the basis of their [P2Ni3]/[ptl] dependence. The formation constants for γ-picoline complexes at 25 ℃ are K1=80, K2=610, and K3=190 L mol-1. The monopicoline complex has greater affinity for γ-picoline than P2Ni3. A degradation product, [Ni2(WO2)(PW9O34)2]12-, was also identified at low pH by measuring the NMR spectrum of pyridine coordinated to it. The isotropic NMR shifts come mainly from the contact interaction due to σ -electron delocalization.
Page	1176 - 1179
Full Text	PDF

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