Chemiluminescent intensities from substituted lophines was written by Philbrook, G. E.;Maxwell, M. A.. And the article was included in Tetrahedron Letters in 1964.Formula: C22H16N2O2 This article mentions the following:
Chemiluminescent intensities of 14 lophine derivatives, substituted in the 3 and (or) 4 position(s) of the 2-phenyl group, were determined in 7:3 Me2SO-H2O solution, N in NaOH. O was passed through the solution continuously. The intensity of emission passed through a maximum (Imaximum) after 1-2 min. and then declined. A Hammett plot of Imaximum/I0 against 蟽 values was reported, where I0 is the intensity maximum for lophine (I). The observed slope, -1.96 卤 0.06, compares with a value of -1.16 卤 0.06 obtained when similar plots were constructed with 蟽+ values (Brown and Okamoto, CA 53, 9120f). The emission intensity was a linear function of concentration for I, and the 4-carboxy, 4-MeO, 3,4-dimethoxy, and 4-Cl derivatives over the concentration range 3 脳 10-3 to 3 脳 10-5 M. The chemiluminescent maximum for all the compounds, except the nitro derivative, fell at 5300 A. It appeared that the chemiluminescent processes in all cases examined yield the same mol. fragment. Probably the substituent present in the original derivative was not present in this fragment. In the experiment, the researchers used many compounds, for example, 4-(4,5-Diphenyl-1H-imidazol-2-yl)benzoic acid (cas: 5496-35-5Formula: C22H16N2O2).
4-(4,5-Diphenyl-1H-imidazol-2-yl)benzoic acid (cas: 5496-35-5) belongs to imidazole derivatives. Imidazole is a heterocyclic compound with a five-membered planar ring. It is amphoteric and highly polar. This ring system is present in important biological building blocks, such as histidine and the related hormone histamine.Formula: C22H16N2O2
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem