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A promising class of luminescent derivatives of Silver(I) and Gold(I)‐ N ‐heterocyclic carbene
Author(s) -
Jhulki Lalmohan,
Purkait Rakesh,
Kisan HemantaK.,
Bertolasi Valerio,
Isab AnvarhuseinA.,
Sinha Chittaranjan,
Dinda Joydev
Publication year - 2020
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5673
Subject(s) - chemistry , time dependent density functional theory , carbazole , density functional theory , luminescence , pyridine , chromophore , quantum yield , crystallography , carbene , ground state , photochemistry , computational chemistry , medicinal chemistry , organic chemistry , catalysis , fluorescence , physics , optoelectronics , quantum mechanics
Starting from proligand 1‐methyl‐2‐(phenyl)imidazo[1,5‐a]pyridine‐2‐iumchloride ( 1 .HCl), 1‐methyl‐2‐(phenyl)imidazo[1,5‐a]pyridine silver(I)chloride, ( 2 ) has been prepared. Synthesis, structures and photophysical properties of (2,2 / −bipyridyl)‐1‐methyl‐2‐(phenyl)imidazo[1,5‐a]pyridinesilver(I)hexaflurophosphate, ( 3 ), 1‐methyl‐2‐(phenyl)imidazo[1,5‐a]pyridinesilver(I)carbazolate, ( 4 ) and 1‐methyl‐2‐(phenyl)imidazo[1,5‐a]pyridinegold(I)carbazolate, ( 5 ) are focused. Herein we have first reported the NHC‐Ag‐(bpy/carbazole). All the complexes have been characterized by elemental analysis, various spectroscopic studies and finally screened for luminescent properties. All the complexes are strongly emissive. Solid state structures of 2 , 3 , 4 and 5 have been determined by X‐ray diffraction studies. Conventionally, complex 2 adopts linear geometry whereas complex 3 embraces triangular planar geometry around Ag; complex 4 and 5 clinches linear geometry around Ag/Au. All the complexes absorb light within 275–343 nm. Complex 3 is luminous at ~407 mn, whereas complex 4 and 5 luminous at ~360 nm having short life time 1.00–6.97 ns. The quantum yield (Φ em ) of the complexes varies 0.106–0.186. It is expected variation of luminescence arises due to change of metal and the chromophore (bpy/carbazole). Density Functional Theory (DFT) and Temparature Dependent Density Functional Theory (TDDFT) calculations were performed to verify crystallographically derived parameters and to calculate the UV–Vis properties of the ground state as well as of the first excited state of the complexes.