Phthalocyanines are used as various applications, including as organic charge carriers in photocopiers, laser light absorbers in data storage systems, photoconductors in photovoltaic cells and electrochromic displays, and non-colored transparent film in visible region. The absorption maxima of phthalocyanines are best if moved near the infrared region for these applications. The Q band of phthalocyanines can be moved to bathochromic effects through extension of a π conjugation system such as naphthalocyanines and anthracyanines. Yields of naphthalocyanines and anthracyanines are, however, low. To solve the problem, novel metal phthalocyanines having non-peripheral S-aryl substituent were synthesized. The novel phthalocyanines show a high strain structure and no liquid crystal property. The target compounds were synthesized: 15 phthalocyanines from 2,3-dicyanohydroquinone in 3 steps via 1,2-dicyanobenzene-3,6-bis(trifluorate) and 1,2-dicyanobenzene-3,6-thiophenols. The Q bands of obtained compounds appeared in the near-infrared region. In particular, lead 1,4,8,11,15,18,22,25-octakis(thiophenylmethyl)phthalocyanine shows a Q band at 857 nm. Furthermore, non-colored transparent films in the visible region can be produced.
Two new peripherally substituted with 4 and 8 electron-donating 4-methylthiophenyl silicon phthalocyanines, [Formula: see text] 1 and [Formula: see text] 2, axially substituted with carboxylic acids have been synthesized using microwave irradiation in a very good yield. The new compounds have been characterized by 1H-NMR, UV-vis, fluorescence, differential pulse voltammograms, and HR-MALDI-TOF mass spectrometry. An study of the stability of the axial chlorinated SiPcs in the function of the number of thiophenyl substituents indicates than [Formula: see text] 10 degradates faster, to its corresponding unreactive dihydrosilicon phthalocyanine derivative [Formula: see text] 11, than [Formula: see text]. The new SiPcs are excellent candidates as photoactive linkers for the construction of MOF materials.