Synthesis and Properties of Phthalocyanines Substituted with Four Crown Ethers

Microwave-assisted synthesis and characterization and theoretical calculations of the first example of free and metallophthalocyanines from salen type Schiff base derivative bearing thiophen and triazole heterocyclic rings

“…The Q band absorption present in (4) can be attributed to the fact that the symmetry of metal-free phthalocyanine is nondegenerate (D 2h ) and is split in a Q x and a Q y peak as shown in the spectrum [30]. Also, an increase in the concentration leads to aggregation which is easily monitored by the position of the Q band which is shifted to shorter wavelengths, and to a decrease in molar absorption coefficient [31][32][33].…”

Synthesis and characterization of new metal-free and metal phthalocyanines with peripheral N'-2-(cyanoethyl)-aminoethylsulfanyl substituents

“…The addition of acrylonitrilin 3 was indicated by two more peaks at 2.21 (NH) and 2.59 ppm (NC-CH 2 ). The 1 H NMR spectra of phthalocyanine 5 is rather broad, the probable cause being aggregation of the phthalocyanines, which is frequently encountered at the concentrations used for NMR measurements [2,23,27]. 1 H NMR measurements of (6) were precluded owing to the paramagnetic nature of the cobalt(II) ion in a square planar environment.…”

Protonation and Coordinative Properties of 14-Membered Tetraaza Macrocycles Linked to Phthalocyanines

“…The macrocyclic groups have been crown ethers [8,9], monoaza crown ethers [10], tetraaza [11], diazatrioxa [12], diazadioxa [13], or tetrathia macrocycles [14]. These structures allow for the chelation of a wide range of metal ions at the periphery in addition to that at the inner core; pentanuclear complexes with alkali and earth alkali cations, transition metals, and/or rare earth metal ions are formed [15].…”