Abstract
E.S.R. experiments at 1·3 K are reported for the photo-excited triplet state of zinc porphin (ZnP) and magnesium porphin (MgP) in single crystals of n-octane. The effect of partial and complete deuteriation, and the influence on the E.S.R. spectra of the addition of ethanol or benzene as a second solvent are given. It is found that most of the ZnP molecules occupy one orientation, whereas MgP + ethanol occurs in two orientations for which the molecules are coplanar but differ by a rotation of 90° about the out-of-plane axis. For ZnP, MgP, and free base porphin (H2P) the zero-field principal axes are parallel to within 5° and run through opposite nitrogen atoms. By E.S.R. combined with X-ray diffraction an insight into the orientation of the porphin molecules in the n-octane host is obtained. The fine structure results show a small (ZnP) to negligible (MgP) influence of the spin-orbit coupling of the metal atom. The observed hyperfine structure in ZnP closely resembles that in MgP and originates from four ...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
