Time-resolved EPR spectra of the triplet excited states of diaminoacridine guests in polar potassium hydrogen phthalate single crystals.
Mixed crystals of potassium hydrogen phthalate containing 3,6-diaminoacridine were photoexcited with visible light and the resulting triplet excited states were analyzed by time resolved EPR spectroscopy. Spectra from discrete growth sectors were compared with powders and polycrystalline glasses prepared at various pHs. The data yield the predominant protonation state and orientation of the triplets in each of a pair of growth sectors bounding the positive and negative ends of the polar crystal.
Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy.
Marco
M
Bellinazzi
Antonio
A
Barbon
Bart
B
Kahr
Jason B
JB
Benedict
Marina
M
Brustolon
D000609:Aminoacridines / Q000737:chemistry* / Q000378:metabolism / Q000528:radiation effects; D003460:Crystallization; D004578:Electron Spin Resonance Spectroscopy; D008027:Light; D010795:Phthalic Acids / Q000737:chemistry* / Q000378:metabolism / Q000528:radiation effects; D013997:Time Factors
D000609:Aminoacridines; D010795:Phthalic Acids; C032279:phthalic acid