Serendipitous synthesis of trimetallic porphyrazine triads

Low Symmetry Phthalocyanines and Their Analogues

“…Several single-crystal X-ray structures have been reported. 63,92,176,185,194,203,204,207,[209][210][211]237,240,260,262,321,330,334,335,[337][338][339]360,392,402 Work by Barrett and Hoffman 203,204,207,[209][210][211]334,335,[337][338][339]392 on Pz compounds has been particularly prominent in this regard, in recent years. There has been a growing focus on excited state properties over the past decade.…”

“…Singlet oxygen is produced from triplet oxygen by energy transfer from the triplet excited state of a porphyrinoid chromophore generated by intersystem crossing. 190 EPR spectroscopy 53,62,115,123,128,134,135,188,190,204,210,211,334,340,392,429 and magnetic susceptibility measurements 98,133,203,204,207,262,392 are also often made when a paramagnetic metal forms a complex either in the ligand cavity or with peripheral substituents. Over the past decade, time-resolved electron paramagnetic resonance (TREPR) 123,129,188,189,296,401 data have occasionally been reported.…”

“…The reactivity of peripheral fused rings can also be exploited. For example, Barrett, Hoffman, and co-workers have formed diaminoporphyrazines via a reaction of a peripheral selenodiazole fused ring with H 2 S in pyridine, ,,,− ,,, due to low reactivity of diaminomaleonitrile in mixed condensations. The -NH 2 substituents can be further modified to form peripherally appended Schiff base metal chelates, ,, picalinomido chelates, ,, and peripheral pyrazine rings .…”

“…In addition to UV−visible absorption, NMR and IR spectroscopy, and mass spectrometry (MS), which are now used almost universally to characterize newly synthesized porphyrinoids, and the more specialized techniques of MCD spectroscopy and cyclic voltammetry, research has also been carried out based on a wide range of other characterization techniques. Several single-crystal X-ray structures have been reported. ,,,,,,,,− ,,,,,,,,,− ,,, Work by Barrett and Hoffman ,,,− ,,,− , on Pz compounds has been particularly prominent in this regard, in recent years. There has been a growing focus on excited state properties over the past decade .…”

“…There has been a growing focus on excited state properties over the past decade . Fluorescence excitation and emission spectra, ,,,,− ,,,,,,,,− ,,,,,,, ,,,,,,,,,− ,,,,,,,,,,,,,,,,,,,,,,,,,,,, excited state lifetimes and decay curves, ,,,,,,,,,,,,,,,,,,,,,,− ,,,,,,,,,,, fluorescence quantum yields, ,,,…”