The Relativistic Heavy Ion Collider (RHIC), as the world's first and only polarized proton collider, offers a unique environment in which to study the spin structure of the proton. In order to study the proton's transverse spin structure, the PHENIX experiment at RHIC took data with transversely polarized beams in 2001-02 and 2005, and it has plans for further running with transverse polarization in 2006 and beyond. Results from early running as well as prospective measurements for the future will be discussed.

The electronic and geometric structural changes of acetone upon protonation are studied by 3C NMR spectroscopy and by molecular orbital (MO) calculations using the LORG (local orbital/local origin) method to calculate chemical shieldings and the CLOPPA (contributions for localized orbitals within the polarised propagator approach) analysis of the J coupling constants. In protonated acetone the 13C NMR spectrum has been resolved and two different methyl resonances (1.2 ppm apart) have been assigned. The one-bond C-C coupling constants

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The proton-coupled "C NMR and 'H NMR spectra of azidobenzene, tetrazolo~l,5-~]pyridine, Zazidopyrimidine and tetrazolo[l,lulpyrimidine in different solvents have been analysed, and criteria for using the NMR spectral parameters (especially the 13C-'H coupling constants) for tautomeric structure determination have been elaborated. The efficiency of these criteria has been demonstrated in studies of azidetetrazole equilibria in 2,4-and 4,6-diazidopyrimidines. The ditetrazolo tautomeric form of 2,4diazidopyrimidine has been found in polar solvents.

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