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Ferrous and ferric ...
Ferrous and ferric complexes with cyclometalating N-heterocyclic carbene ligands : a case of dual emission revisited
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- Johnson, Catherine (författare)
- Uppsala University,Uppsala universitet,Fysikalisk kemi
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- Schwarz, Jesper (författare)
- Lund University,Lunds universitet,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Deegbey, Mawuli (författare)
- North Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA.,North Carolina State University
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- Prakash, Om (författare)
- Lund University,Lunds universitet,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Sharma, Kumkum (författare)
- Lund University,Lunds universitet,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Huang, Ping (författare)
- Uppsala University,Uppsala universitet,Molekylär biomimetik
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- Ericsson, Tore (författare)
- Uppsala University,Uppsala universitet,Materialfysik
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- Häggström, Lennart (författare)
- Uppsala University,Uppsala universitet,Institutionen för fysik och astronomi
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- Bendix, Jesper (författare)
- Univ Copenhagen, Dept Chem, Univ Pk 5, DK-2100 Copenhagen, Denmark.,University of Copenhagen
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- Gupta, Arvind Kumar (författare)
- Lund University,Lunds universitet,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Jakubikova, Elena (författare)
- North Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA.,North Carolina State University
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- Wärnmark, Kenneth (författare)
- Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,LTH profilområde: Nanovetenskap och halvledarteknologi,LTH profilområden,LU profilområde: Ljus och material,Lunds universitets profilområden,Other operations, LTH,Faculty of Engineering, LTH,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: Nanoscience and Semiconductor Technology,LTH Profile areas,Faculty of Engineering, LTH,LU Profile Area: Light and Materials,Lund University Profile areas
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- Lomoth, Reiner (författare)
- Uppsala University,Uppsala universitet,Fysikalisk kemi
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(creator_code:org_t)
- Royal Society of Chemistry, 2023
- 2023
- Engelska.
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Ingår i: Chemical Science. - : Royal Society of Chemistry. - 2041-6520 .- 2041-6539. ; 14:37, s. 10129-10139
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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http://dx.doi.org/10... (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- Iron N-heterocyclic carbene (FeNHC) complexes with long-lived charge transfer states are emerging as a promising class of photoactive materials. We have synthesized [Fe-II(ImP)(2)] (ImP = bis(2,6-bis(3-methylimidazol-2-ylidene-1-yl)phenylene)) that combines carbene ligands with cyclometalation for additionally improved ligand field strength. The 9 ps lifetime of its (MLCT)-M-3 (metal-to-ligand charge transfer) state however reveals no benefit from cyclometalation compared to Fe(II) complexes with NHC/pyridine or pure NHC ligand sets. In acetonitrile solution, the Fe(II) complex forms a photoproduct that features emission characteristics (450 nm, 5.1 ns) that were previously attributed to a higher ((MLCT)-M-2) state of its Fe(III) analogue [Fe-III(ImP)(2)](+), which led to a claim of dual (MLCT and LMCT) emission. Revisiting the photophysics of [Fe-III(ImP)(2)](+), we confirmed however that higher ((MLCT)-M-2) states of [Fe-III(ImP)(2)](+) are short-lived (<10 ps) and therefore, in contrast to the previous interpretation, cannot give rise to emission on the nanosecond timescale. Accordingly, pristine [Fe-III(ImP)(2)](+) prepared by us only shows red emission from its lower (LMCT)-L-2 state (740 nm, 240 ps). The long-lived, higher energy emission previously reported for [Fe-III(ImP)(2)](+) is instead attributed to an impurity, most probably a photoproduct of the Fe(II) precursor. The previously reported emission quenching on the nanosecond time scale hence does not support any excited state reactivity of [Fe-III(ImP)(2)](+) itself.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
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Johnson, Catheri ...
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Schwarz, Jesper
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Deegbey, Mawuli
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Prakash, Om
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Sharma, Kumkum
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Huang, Ping
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Ericsson, Tore
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Häggström, Lenna ...
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Bendix, Jesper
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Gupta, Arvind Ku ...
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Jakubikova, Elen ...
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Wärnmark, Kennet ...
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Lomoth, Reiner
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