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The crystal structure of pyridine betaine hydrochloride (PBET HCl) was determined by X-ray diffraction to be monoclinic, space group P2 1 /c with a = 8.533(2) 9, b = 9.548(2) 9, c = 10.781(2) 9, β = 107.228(3)° and Z = 4. Betaine is protonated and the carboxyl group forms a hydrogen bond with the chloride ion: O Cl - distance is 2.928(3) 9.The interaction of pyridine betaine...
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