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Inclusion of rhodamine B byβ-cyclodextrin. An equilibrium and kinetic spectrophotometric study

Abstract

A UV/visible spectrophotometric temperature-jump study of the inclusion of the rhodamine B zwitterion (RB) by β-cyclodextrin (βCD) to form a 1:1 complex (RB·βCD) in aqueous 1.00 mol dm−3 NaCl at pH 6.40 and 298.2 K yields:k 1=(1.3±0.2)×108 dm3 mol−1 s−1,k −1=(2.2±0.5)×104 s−1, andK 1=(5.9±2.3)×103 dm3 mol−1 for the equilibrium:

$${\text{RB + }}\beta {\text{CD}}{\text{RB}} \cdot \beta {\text{CD}} K_1 $$

Under the same conditions the dimerization of RB:

$${\text{2}} {\text{RB}}({\text{RB}})_2 K_d $$

is characterized byK d =(1.8±1.0)×103 dm3 mol−1. The interaction of RB with αCD and γCD is weaker than with βCD, and is discussed in terms of the relative sizes of RB and the cyclodextrin annulus. Comparisons are made with the inclusions of other dyes by cyclodextrins.

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Correspondence to Stephen F. Lincoln.

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Lincoln, S.F., Coates, J.H. & Schiller, R.L. Inclusion of rhodamine B byβ-cyclodextrin. An equilibrium and kinetic spectrophotometric study. Journal of Inclusion Phenomena 5, 709–716 (1987). https://doi.org/10.1007/BF00656590

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Key words

  • Cyclodextrin
  • rhodamine B
  • equilibrium
  • kinetics
  • temperature-jump