Abstract:
:The crystal and molecular structure of the title compound 4 have been determined by single crystal X-ray crystallography. The structure shows the typical S4-ruffled conformation observed for Ni(II) tetrapyrroles. Compared to the structure of the methyl ester of (13(2)-demethoxycarbonyl-pheophorbidato a)nickel(II), 4 shows a smaller Ca-Cm-Ca angle and a higher degree of conformational distortion at the methyl-substituted C20 position. This local distortion of the macrocycle might account for the bathochromic shifted absorption spectra of the bacteriochlorophylls c compared to the d-series. Crystal data: C35H38N4NiO3; tetragonal, P4(3)2(1)2, a = 15.335(7) A, c = 25.11(2) A, V = 5904, Z = 8, lambda(Mo K alpha) = 0.71069 A, mu = 0.701 mm-1, F(000) = 2624, 130 K, R = 0.058 for 5700 reflections with F > 4.0 sigma(F).
journal_name
Photochem Photobioljournal_title
Photochemistry and photobiologyauthors
Senge MO,Smith KMdoi
10.1111/j.1751-1097.1994.tb05080.xsubject
Has Abstractpub_date
1994-08-01 00:00:00pages
139-42issue
2eissn
0031-8655issn
1751-1097journal_volume
60pub_type
杂志文章abstract::Evanescent wave illumination with total internal reflection is often used to provide excitation near a quartz-water interface. We now show that evanescent illumination at one wavelength and incident angle, coupled with light quenching at a second wavelength and incident angle, can be used for selective excitation of f...
journal_title:Photochemistry and photobiology
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