SOLUTION PHASE H-1 AND C-13-NMR STUDIES OF SOME 1,4,8,11,15,18,22,25-OCTA-ALKYLPHTHALOCYANINES

Solution state H-1 NMR and C-13 NMR spectral data are reported for 1,4,8,11,15,18,22,25-octahexylphthalocyanine, its zinc metallated analogue, and 1,4,8,11,15,18,22,25-octanonylphthalocyanine. Full H-1 and C-13 NMR signal assignments for these compounds have been made using one and two dimensional techniques supported by T1 measurements. C-13 NMR spectra of the two metal-free derivatives show only three signals in the aromatic region at 100 MHz but the expected four resonances at 22.5 MHz. The apparent absence of one of these at 100 MHz is ascribed to a fast exchange process, originating from N-H...N reversible N...H-N tautomerism.