Controlling Near-Infrared Chromophore Electronic Properties through Metal–Ligand Orbital Alignment

2017 ◽  
Vol 139 (7) ◽  
pp. 2808-2815 ◽  
Author(s):  
Nicole M. Mews ◽  
Andreas Berkefeld ◽  
Gerald Hörner ◽  
Hartmut Schubert
Keyword(s):  
Electronic Properties ◽  
Near Infrared ◽  
Ligand Orbital ◽  
Metal Ligand

Schwingungs-und Elektronenspektren der bindungsisomeren Hexakis(thiocyanato(N)-thiocyanato(S))-osmate(III) und (IV) / Vibrational and Electronic Spectra of Bond-Isomeric Hexakis(thiocyanato(N)-thiocyanato(S))osmates(III) and (IV)

1988 ◽  
Vol 43 (4) ◽  
pp. 371-381 ◽  
Author(s):  
K. Bütje ◽  
W. Preetz
Keyword(s):  
Charge Transfer ◽  
Vibrational Spectra ◽  
Near Infrared ◽  
Bathochromic Shift ◽  
Infrared Region ◽  
Hypsochromic Shift ◽  
Linkage Isomers ◽  
Near Infrared Region ◽  
Ir And Raman ◽  
Metal Ligand

AbstractWell-resolved IR and Raman spectra of the two sets of all 10 isomeric complexes [Os(NCS)n(SCN)6-n]3-/2-, n = 0-6, have been recorded. For both series, νCS(N) > νCS(S) and δNCS > δSCN; for the Os(III) complexes, vCN(N) ~ vCN(S) and vOsN ≥ vOsS while for the Os(IV) compounds, vCN(N) < vCN(S) and vOsN ~ vOsS. The vibrational spectra of the n = 0 and n = 6 members of both sets are assigned according to D3d and Oh point symmetry, respectively. For the mixed linkage isomers the band pattern is strongly influenced by pseudo-octahedral coupling wherever frequencies of N- and S-bonded groups coincide. The metal-ligand stretching region is therefore assigned according rather to pseudo-Oh, pseudo-D3d and pseudo-D4h symmetry than to D4h, C4v, C3v and C2v microsymmetry. The charge-transfer spectra of both series are similar, showing a parallel hypsochromic shift with increasing n value. Upon oxidation, a bathochromic shift of the CT bands by an average of 5400 cm-1 is observed, and the intensity increases by a factor 2-2.5. Weak absorptions in the near infrared region are assigned to intraconfigurational transitions.

Microcrystalline Germanium Photodetectors

2001 ◽  
Vol 664 ◽  
Author(s):  
M. Krause ◽  
H. Stiebig ◽  
R. Carius ◽  
H. Wagner
Keyword(s):  
Electronic Properties ◽  
Near Infrared ◽  
Short Circuit ◽  
Chemical Vapor ◽  
Short Circuit Current ◽  
Infrared Light ◽  
High Hydrogen ◽  
Sensor Applications ◽  
Hydrogen Dilution ◽  
Structural And Electronic Properties

ABSTRACTFor sensor applications in the detection of near infrared light we have prepared μc-Ge:H by plasma enhanced chemical vapor deposition (PECVD) with a mixture of germane and hydrogen, investigatedits structural and electronic properties and incorporated it into thin pin diodes. In order to ensure microcrystalline growth we had to use high hydrogen dilution. However, only the material prepared with a ratio of germane to hydrogen of 0.2% shows high crystallinity. The optical absorption is remarkably different from c-Ge and exhibits no indication of a direct gap at 0.8eV. When this material is implemented as part of a 110nm thin absorber, a short circuit current of 20mA/cm2 and a quantum efficiency of 15% at a wavelength of 1.1μm are achieved. Higher germane concentrations in hydrogen lead to poor electronic properties due to an increase of the amorphous phase and the short circuit current of the devices deteriorates. As for crystalline germanium photodiodes cooling of the devices is used to overcome the restrictionoriginating from the high free carrier concentration.

Recent advances in organic near-infrared photodiodes

2018 ◽  
Vol 6 (14) ◽  
pp. 3499-3513 ◽  
Author(s):  
Xiaodong Liu ◽  
Yiwei Lin ◽  
Yingjie Liao ◽  
Jiazun Wu ◽  
Yonghao Zheng
Keyword(s):  
Electronic Properties ◽  
Organic Semiconductors ◽  
Near Infrared ◽  
Recent Advances ◽  
Infrared Photodiodes ◽  
Organic Photodetectors

Both broadband and narrowband organic photodetectors can be realized due to the easily tunable optical/electronic properties of organic semiconductors.

Ligand Field-Actuated Non-Innocence of Acetylacetonate

2020 ◽  
Author(s):  
Morten Gotthold Vinum ◽  
Laura Voigt ◽  
Steen Hansen ◽  
Colby Bell ◽  
Kensha Marie Clark ◽  
...  
Keyword(s):  
Noble Metals ◽  
Chemical Reactivity ◽  
Energy Levels ◽  
Orbital Energy ◽  
Ligand Field ◽  
Ligand Orbital ◽  
Catalytic Cycles ◽  
Electrochemical Potentials ◽  
New Strategies ◽  
Metal Ligand

<p>The quest for simple ligands to participate in concerted base metal-ligand multiple-electron redox events is driven by perspectives of replacing noble metals in catalysis and for discovering novel chemical reactivity. Yet the vast majority of simple ligand systems displays electrochemical potentials impractical for catalytic cycles substantiating the importance of new strategies towards aligned metal–ligand orbital energy levels. We herein demonstrate the possibility to establish and tame the elusive <i>non-innocence</i> of the ubiquitous acetylacetonate (acac), that is the most commonly employed anionic, chelating ligand towards elements across the entire Periodic Table. By employing the ligand field in the high-spin Cr(II) as a thermodynamic switch, we were able to chemically tailor the occurrence of metal–ligand redox events. The very mechanism can be understood as a destabilization of the d<i><sub>z</sub></i>2 orbital relative to the <i>pi</i>* LUMO of acac, which proffers a generalizable strategy to synthetically engineer non-innocence with seemingly redox-inactive ligands. </p>

Differences in actinide metal–ligand orbital interactions: comparison of U(iv) and Pu(iv) β-ketoiminate N,O donor complexes

2011 ◽  
Vol 47 (27) ◽  
pp. 7647 ◽  
Author(s):  
David D. Schnaars ◽  
Enrique R. Batista ◽  
Andrew J. Gaunt ◽  
Trevor W. Hayton ◽  
Iain May ◽  
...  
Keyword(s):  
Orbital Interactions ◽  
Ligand Orbital ◽  
Metal Ligand

Synthesis and electronic properties of carbazole-based core-modified diporphyrins showing near infrared absorption

2020 ◽  
Vol 56 (95) ◽  
pp. 15048-15051
Author(s):  
Chihiro Maeda ◽  
Takuma Shirakawa ◽  
Tadashi Ema
Keyword(s):  
Electronic Properties ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Nir Absorption

A highly conjugated carbazole-based fused diporphyrin shows NIR absorption.

On the opto-electronic properties of phosphine and thiolate-protected undecagold nanoclusters

2014 ◽  
Vol 16 (35) ◽  
pp. 18749-18758 ◽  
Author(s):  
Francesco Muniz-Miranda ◽  
Maria Cristina Menziani ◽  
Alfonso Pedone
Keyword(s):  
Electronic Properties ◽  
Metal Metal ◽  
Metal Ligand

A schematic description of the UV-vis spectrum of Au11(PPh3)7Cl3 nanoclusters. Metal → metal transitions are ubiquitous, metal → ligand transitions appear above the visible threshold, while ligand → metal and ligand → ligand transitions are much rarer in the investigated range of energies.

scholarly journals Syntheses, spectroscopic, redox, and structural properties of homoleptic Iron(III/II) dithione complexes

RSC Advances ◽  
2020 ◽  
Vol 10 (63) ◽  
pp. 38294-38303
Author(s):  
Kyle J. Colston ◽  
Sara A. Dille ◽  
Benjamin Mogesa ◽  
Jacilynn Brant ◽  
Victor N. Nemykin ◽  
...  
Keyword(s):  
Structural Properties ◽  
Ligand Orbital ◽  
Orbital Mixing ◽  
Metal Ligand

Two sets of FeIII/II complexes, synthesized from N,N′-diisopropyl piperazine-2,3-dithione (iPr2Dt0) and N,N′-dimethyl piperazine-2,3-dithione (Me2Dt0) ligands, exhibit electronically asymmetrical ligands with metal–ligand orbital mixing.

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