𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Visible absorption and luminescence spectra of N-methyldeuteroporphyrin complexes and the question of “sitting-atop” complexes

✍ Scribed by David K. Lavallee; Marilyn J. Bain-Ackerman

Publisher
Elsevier Science
Year
1978
Weight
669 KB
Volume
9
Category
Article
ISSN
0006-3061

No coin nor oath required. For personal study only.

✦ Synopsis

ABSTRACf

Visible spectra of manganese(II), cobaIt(II), and zinc(I1) complexes of N-methyideuteroporphyrirr IX dimethyl ester are similar to ench other in both energies and intensities of absorption bands. These spectra are also quite similar to the spectrum of the monoprotonated ligand, as found earlier for complexes of N-methyltetraphenylporphyrin. Luminescence intensities of N-methyldeuteroporphyrin complexes, however, are dependent on identity of the metal ion and axial l&and, varying in the order: free ligand > CT-Zn(II) complex > Br-Zn(II) complex S Sfn(II) comp1e.q Co(H) complex. Complexation of metal ions to N-methyltetraphenylporphyrin results in reduction in emission, with intensities of the complexes varying in the order: Zn(II) > Cd(I1) > Fe(II), hfn(II), Co(H). Formation of ion pairs consisting of a porphyrin cation and a metal-containing anion results in a fluorescence. spectrum similar to that of the porphyrin ion pair formed by addition of HCI, without substantial quenching. Luminescence spectra provide conclusive evidence for the formation of ion pairs rather than "sitting-atop" complexes under conditions where the nature of such species has been controversial_

📜 SIMILAR VOLUMES

Triphenylphosphine complexes of platinum
Triphenylphosphine complexes of platinum(0); their absorption and emission spectra and luminescence lifetimes
✍ Silvana Sostero; Maurizio Lenarda; Orazio Traverso; W.John Reed; Terence J. Kemp 📂 Article 📅 1981 🏛 Elsevier Science 🌐 English ⚖ 307 KB

The spectroscopy and photophysics of a series of Pt" complexes [L2Pt\*X] (L = PPh3, AsPh,; X = ethylene, tetracyanoethylene, fimaronitrile and tetracyanocyclopropane) have been examined from the following viewpoints:

Kinetics and mechanisms of the formation
Kinetics and mechanisms of the formation of a sitting-atop complex of N-alkylporphyrin with Al(III) in moist acetonitrile
✍ Keiichi Tsukahara; Yoshiaki Onoue; Naoko Fujiwara 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 100 KB

The formation of a sitting-atop complex of a N-alkylporphyrin, containing a 6-hydroxyhexyl group, with Al ^3+^ was studied in moist acetonitrile by equilibrium and kinetic measurements. A sandwich type of metalloporphyrin, where a metal ion binds two N-alkylporphyrins, appears to be formed under the

Concave Macrobicycles: Absorption Spectr
Concave Macrobicycles: Absorption Spectra, Luminescence Properties, and Endocavital Complexation of Neutral Organic Guests
✍ Vögtle, Fritz ;Michel, Ingo ;Berscheid, Ralf ;Nieger, Martin ;Rissanen, Kari ;Ko 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 746 KB

## Abstract By a mild modified Eglinton coupling a series of diynebridged macrobicyclic hosts capable of endocavital complexation were synthesized and their structures and complexation properties investigated by X‐ray analysis. The inclusion of DMSO in 7 suggests a direct correlation between steric