Cation or Solvent-Induced Supermolecular Phthalocyanine Formation: Crown Ether Substituted Phthalocyanines.
Abstract
Phthalocyanies with four 15-crown-5 ether voids at the 3,4 positions (MtCRPc) (Mt = H2, Zn, Co, Ni and Cu) have been synthesized and characterised. Dimerization of MtCRPC is induced in solvents such as methanol and by addition of some cations (K(+), Ca(2+), and NH4(+), especially K(+). Cofacial dimer formation in the presence of these cations proceeds in a two-step three stage process, as indicated by absorption and emission spectroscopy. These species have a highly specific D4h eclipsed configuration providing well defined dimeric species for spectroscopic analysis. The ESR spectrum of the cation induced dimeric CuCRPc shows axial symmetry and may be analysed in terms of an inter-planar separation of 4.1 Angstroms. The 1H NMR spectra of the cation induced metal free and zinc dimers are consistent with an eclipsed configuration. Upper excited state (Soret, S2) emission is observed for the first time in the phthalocyanine series.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1987
- Accession Number
- ADA185225
Entities
People
- Alfred B. Lever
- Nagao Kobacashi
Organizations
- University of York