Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Synthesis and Luminescence of a Charge-Neutral, Cyclometalated Iridium(III) Complex Containing N-C-N- and C-N-C-Coordinating Terdentate Ligands.Electric Literature of C22H17N3.
The first examples of iridium(III) complexes containing a terdentate, N-C-N-coordinated 1,3-di(2-pyridyl)benzene derivative, cyclometalated at C2 of the benzene ring, are reported. This mode of binding becomes significant only if competitive cyclometalation at C4/C6 is blocked, and the ligand 1,3-di(2-pyridyl)-4,6-dimethylbenzene (dpyxH) has been prepared to achieve this condition. The charge-neutral complex [Ir(dpyx)(dppy)], 2, (dppyH2 = 2,6-diphenylpyridine) has been isolated, containing dpyx and dppy bound to the metal through one and two carbon atoms, resp. A terpyridyl analog, [Ir(dpyx)(ttpy)](PF6)2, 3, (ttpy = 4′-tolylterpyridine) has also been prepared and its x-ray crystal structure determined, confirming the N-C-N binding mode of dpyx. Complex 2 emits strongly in degassed solution at 295 K (λmax = 585 nm, φ = 0.21, τ = 3900 ns, in CH3CN). In solution, the excited state can also undergo photodissociation, through cleavage of one of the Ir-C(dppy) bonds.
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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI