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Scheme IV Co(en)2(OH2)23+ + 2S02 -Co(en)2(OS02H)2+ v +' * * Co(en)2(OS02)(OS02H) --' -9 =d-Co(en)2(OS02)2" CoII(en)2(02SvO)(O2SIVO)_ Registry No. Zra/ií-[Co(en)2(OH2)(OH)]2+, 24458-51-3; trans-[Co-(en)2(OH)2]+, 21772-94-1; trans-[Co(en)2(OS02H)2]+, 100021-53-2; iraní-[Co(en)2(OH2)(OH)](C104)2, 14099-22-0; S02, 7446-09-5.

We have examined a series of metaphosphate glasses with 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. Increasing the ionic potential (Z/u) of the modifying cation from sodium to magnesium causes a systematic change to more shielded isotropic chemical shifts with a concomitant increase in the peak FWHM. These spectral trends are consistent with counterion-induced modifications to the ionic character of the P-0 bond. Such modifications do not produce significant changes in either the chemical shift anisotropy or the asymmetry parameter. [

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