Is intermolecular hydrogen-bonding to uncharged metal centers of organometallic compounds widespread in solution? A spectroscopic investigation in hydrocarbon, noble gas, and supercritical fluid solutions of the interaction between fluoro alcohols and (.eta.5-C5R5)ML2 (R = H, Me; M = Co, Rh, Ir; L = CO, C2H4, N2, PMe3) and its relevance to protonation