Photophysical behavior of systematically substituted (di-2-pyridylaminomethyl) benzene ligands and its Re(I) complexes: A combined experimental and theoretical approach

Non-conventional synthesis and photophysical studies of platinum(ii) complexes with methylene bridged 2,2′-dipyridylamine derivatives

“…† The lowest energy absorption bands of the ligands can be assigned to the π-π* transitions within dpa moiety. 27 Studies of photophysical properties of benzyldi(2-pyridyl)amines 1-3 are complicated due to their ability to undergo photocyclization in solution. 39,40 While this process is slow enough to allow the measurement of absorption spectra, strong luminescence of the products and intermediates of the photocyclization interferes with the emission spectra of 1-3 in solution (for details, see section S3 in the ESI †).…”

“…The number of studies on alkylsubstituted di(2-pyridyl)amines is rather limited, 12,13 whereas methylene bridged aromatic derivatives receive more attention recently (Scheme 1, right). Inherent flexibility provided by the methylene linker not only expands the range of possibilities for various supramolecular motifs in solid state, as studied by L. Lindoy et al, [22][23][24] but also allows for non-trivial reactivity 25 and luminescent properties 26,27 of these compounds and their metal complexes. Compared to their conjugated counterparts, methylene bridged dpa derivatives are much easier to synthesize from dpa and corresponding halides via nucleophilic substitution reaction in presence of a base.…”

Deciphering Spectroscopic and Structural Insights into the Photophysical Behavior of 2,2′-Dipyridylamine: An Efficient Environment Sensitive Fluorescence Probe

“…Fluorescence quantum yields (ϕ f ) of DPyA in different media were calculated by comparing the total fluorescence intensity under the whole fluorescence spectral range with that of 1,2-bis(di-2-pyridylaminomethyl)benzene as a standard (ϕ f s ) with the following equation, using adequate correction for the solvent refractive index (n). 20,21 i k j j j j y…”

“…18,19 Recently, the photophysical behavior of a series of flexible 2,2′-dipyridylaminomethyl substituted ligands, systematically substituted on a rigid benzene core, and their corresponding monometallic Re(I) complexes are reported to show unusual fluorescence behavior in a DMSO−water mixture. 20 The presence of an additional long wavelength absorption band was inferred due to the presence of water-induced side chain flexibility of the multichromophoric systems leading to interchromophoric interaction. Considering the versatility of DPyA type of molecules in developing new fluorescence probes for environmental as well as biological application and significant medium dependent modulatory fluorescence behavior, a thorough understanding of the basic photophysical behavior DPyA seems important.…”

Effect of Substituents on Electronic Structure and Photophysical Properties of Re(I)(CO)<sub>3</sub>Cl(R-2, 2’-Bipyridine) Complex: DFT/TDDFT Study

“…It can be easily modified by the introduction of different substituent groups at its different positions. Introduction of electron with drawing group (EWG) or electron withdrawing group (EDG) substituent is useful to tune the energy level of 2, 2'-bipyridine ligand to provide high efficiency PHOLED [10][11][12][13][14][15].…”