Issue 0, 1978

Triplet states of copper and metal-free phthalocyanines

Abstract

Laser flash photolysis has been used to characterise the triplet state of metal-free (H2Pc) and copper phthalocyanine (CuPc) in dilute (10–6 mol dm–3) solution in chloronaphthalene. This first observation of the triplet state of CuPc indicates that its lifetime is very short (∼35 ns), but the quantum efficiency of triplet formation ([gt-or-equal] 0.70) is greater than that for H2Pc (∼0.14). The triplet absorption maximum for both compounds occur at ≈480 nm, but the triplet energy level of CuPc (150 kJ) is higher than that for H2Pc (120 kJ).

More concentrated solutions (10–4-10–5 mol dm–3) of both phthalocyanines give short-lived (100 ns) and long-lived (2.5 µs) transients, which have been attributed to the formation of excitons in microcrystalline particles dispersed in the chloronaphthalene.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans. 2, 1978,74, 1870-1879

Triplet states of copper and metal-free phthalocyanines

J. McVie, R. S. Sinclair and T. G. Truscott, J. Chem. Soc., Faraday Trans. 2, 1978, 74, 1870 DOI: 10.1039/F29787401870

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