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Resonance Raman spectroscopy four-coordinate structure

Proton NMR studies of aqueous arsenious acid solutions show only a single proton resonance attributable to arsenious acid. This result together with Raman spectroscopy suggest the species having a pyramidal structure which can be formulated as As(OH)3. This is to be contrasted with H3PO3, which is HP(0)(0H)2 with four-coordinate phosphorus and which exhibits two distinct proton NMR resonances. Spectroscopic evidence supports the formation of the three anions [H2ASO3], [HAsOs] ", and [AsOs] when solutions of As(OH)3 are treated with hydroxide ion. This observation agrees with a three-step acid dissociation. The pA a for the dissociation of the first proton is 9.2, which means that H3 AsOs is a very weak acid. [Pg.236]

See other pages where Resonance Raman spectroscopy four-coordinate structure is mentioned: [Pg.90]    [Pg.725]    [Pg.314]    [Pg.2111]    [Pg.17]    [Pg.186]    [Pg.2110]    [Pg.317]    [Pg.2246]    [Pg.291]    [Pg.235]    [Pg.20]    [Pg.208]    [Pg.168]   
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See also in sourсe #XX -- [ Pg.215 , Pg.216 , Pg.217 , Pg.218 , Pg.219 , Pg.220 , Pg.221 , Pg.222 , Pg.223 , Pg.224 , Pg.225 , Pg.226 , Pg.227 ]



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Coordination Structures

Four coordinated

Four-coordinate structures

Four-coordination

Raman structures

Resonance Raman

Resonance structures

Resonant Raman spectroscopy

Spectroscopy structure)

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