Organic Solutes in Aqueous Solutions

B80

B84

Thiourea

Reaction: (H2N)2C=S + Mu ® (H2N)2C(SMu)

Type of reaction: addition to C=S with Mu added to S atom

a)      Barnabas, M.V., Venkateswaran, K. and Walker, D.C. Can. J. Chem., 1989, 67, 120.

kM = 5 x 107 dm3mol-1s-1                           at pH = 7.0

b)      Barnabas, M.V. and Walker, D.C. Can. J. Chem., 1991, 69, 1252.

kM = 2 x 109 dm3mol-1s-1                            at pH = 1.0 (strong influence of pH)

KIE = kM / kH = 5 x 107 / 6 x 109 = 0.008     at pH = 7.0

KIE = kM / kH = 2 x 109 / 6 x 109 = 0.33       at pH = 1.0

kH = 6 x 109 dm3mol-1s-1   

from: www.rcdc.nd.edu/compilations/HAtom/H.htm

 

Muonium reactions in the micellar systems

kM » 8 x 108 dm3mol-1s-1 in the CTAB micelles

kM » 5.6 x 107 dm3mol-1s-1 in the SOS micelles

from: Barnabas, M.V. and Walker, D.C., Can. J. Chem. 1999, 69, 1252.


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