The hydrogen bonding of 1,1-diphenyl-2-picrylhydrazyl (DPPH) with chloroform, bromoform, dichloromethane and 1,2-dichloroethane has been examined in carbon tetrachloride by electronic absorption spectroscopy. The equilibrium constants and enthalpies (ΔH⊖) of hydrogen-bond formation vary in the order chloroform > bromoform, dichloromethane > 1,2-dichloroethane.
A. S. N. Murthy and A. R. Reddy, J. Chem. Soc., Faraday Trans. 1, 1982, 78, 1867 DOI: 10.1039/F19827801867
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