The infrared spectra of H2O, D2O, and HDO in nitrogen matrices at temperatures from 20 to 4°K reveal no evidence of rotation of the water molecules. Absorption features attributed to water dimers and the vibrational force constants calculated therefrom are indicative of an open structure with a single moderately weak hydrogen bond. The absence of certain HDO absorptions in the observed spectra can be interpreted as the manifestation of a stronger deuterium-vs-hydrogen bond.

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A new marine toxin dinophysistoxin-2 (DTX-2) 4, isolated from toxic Irish mussels and biogenetically related to the toxins okadaic acid 1 and dinophysistoxin-I (DTX-1) 2, the principal agents responsible for diarrhetic shellfish poisoning (DSP), is reported.

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On the basis of the infrared spectra of HCN and DCN in Ar, N2, and CO matrices at temperatures from 4.5° to 20.5°K, it is concluded that there is no evidence for rotation of the monomeric species in these matrices and that the dimer has a linear or nearly linear HCN·HCN structure. The Lippincott-type potential is used to calculate frequencies for the stretching of the hydrogen bond and for the torsion about the hydrogen bond. These calculated frequencies are compared with our observed far-infrared spectra of dimers in the matrix and with available Raman data on crystalline HCN and DCN.