CHARGE-TRANSFER COMPLEXES INVOLVING CALIX[4]RESORCINARENES - POTENTIAL CANDIDATES FOR NONLINEAR OPTICS

Lipophilic calix[4]resorcinarenes-condensation products of resorcinol and lauryl aldehyde comprising four resorcinol units-form electron don or-acceptor complexes with electron accepters tetracyanoquinodimethane (TCNQ) and tetracyanoethylene (TCNE) in organic solvents. Their forma tion was confirmed by EPR and UV-vis spectroscopy, except for compound s c1 and c3 which did not form charge transfer (CT) complexes with TCN E. Titration experiments involving calixarenes and electron accepters indicated the presence of species of different stoichiometries. Comple xes with ligands c1-c4 were characterised spectroscopically. CT bands appeared in most cases. (C) 1998 John Wiley & Sons, Ltd.