286473-18-5Relevant academic research and scientific papers
A direct comparison of the aggregation behavior of phthalocyanines and 2,3-naphthalocyanines
Choi, Michael T.M.,Li, Pearl P.S.,Ng, Dennis K.P.
, p. 3881 - 3887 (2007/10/03)
Two pairs of analogous zinc(II) phthalocyanines and 2,3- naphthalocyanines with eight butylthio or 3,6-dioxa-1-decylthio substituents have been synthesized and shown to exhibit a substantial aggregation tendency in organic solvents. The visible spectra of the octakis(3,6-dioxa-1- decylthio) naphthalocyanine 7 have been recorded in THF with different concentrations and the data have been analyzed using a nonlinear least- squares fitting procedure giving ε(m) (777 nm), ε(d) (777 nm), and K(d) at 1.95 x 106 M-1 cm-1, 1.29 x 105 M-1 cm-1, and 2.72 x 105 M-1, respectively. Simulated visible spectra for the pure monomeric and dimeric 7 have also been obtained. By variable-concentration and variable-temperature visible spectroscopic studies, the heats of aggregation of all these in toluene have also been determined (-17.1 to -105.0 kJ mol-1). These values depend-largely on the additional interactions due to the substituents. (C) 2000 Elsevier Science Ltd.
