Formation and crystal structure of an unexpected inclusion complex of a metal-free phthalocyanine and oxalic acidElectronic supplementary information (ESI) available: experimental procedure to prepare compound 3 and its characterising data. See http://www.rsc.org/suppdata/cc/b1/b111133g/

Abstract

Treatment of 3-(2,4-dimethyl-3-pentyloxy)phthalonitrile (2) with CeCl3 in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in n-pentanol gives the corresponding metal-free phthalocyanine 3, which unexpectedly traps the oxalic acid in the crystal lattice forming a 1:1 inclusion complex.