Acta Phys. -Chim. Sin. ›› 1991, Vol. 7 ›› Issue (03): 318-322.doi: 10.3866/PKU.WHXB19910311

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Calorimetric and Electrochemical Activity Measurement on the Interaction Between Anionic Cyanine Dye and Its Counterions in J-Aggregate Formation

Zhou Jin-Wei; Li Ya-Rong; Shen Jie-Ru   

  1. Department of Chemistry, Northwestern University, Xi'an 710069
  • Received:1990-03-05 Revised:1990-09-26 Published:1991-06-15
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Abstract: In DMF-H_2O(35%DMF, V/V) solution,the interaction between an anionic cyanine dye, 3,3'-di-(γ-sulfoProPyl)-9-ethyl-4, 5,4', 5'-dinaphthothis-carbocyanine triethylamine salt (Ⅰ) and its counterions, which induced J-aggregate formation, was studied by calorimetric and counterion activity measurement method. From calorimetric diagram,it was found,when CdCl_2 and LaCl_3 were added,J-aggregation enthalpy, △H_s, were -42.6, -42.0 kJ·mol~(-1) and the ratios of bounded counterions to the dye (Ⅰ) J-aggregate were 0.48:1, 0.31:1, respectively. It was also obtained from counterion activety measurement that the ratio of bounded Cd~(2+) to dye II) J-aggregase was 0.47:1. Such results indicated that dye (I) and counterions had formed a salt-like totality in the J-aggregate.

Key words: Cyanine dye, J-aggregate, Counterion, Calorimetry, Ion activity measurement