scholarly journals Redox-active tetraruthenium metallacycles: reversible release of up to eight electrons resulting in strong electrochromism

2016 ◽  
Vol 52 (36) ◽  
pp. 6103-6106 ◽  
Author(s):  
Daniel Fink ◽  
Bernhard Weibert ◽  
Rainer F. Winter
Keyword(s):  
Near Infrared ◽  
Redox Active ◽  
Low Energies

Tetraruthenium macrocycles with 1,4-divinylphenylene and diarylamine-substituted isophthalic acids as the sides display up to eight one-electron redox steps and rich electrochromic behaviour with strong absorptions of the dications in the near infrared and of the tetra- and hexacations at low energies in the visible.

Redox-active, near-infrared dyes based on ‘Nindigo’ (indigo-N,N′-diarylimine) boron chelate complexes

2013 ◽  
Vol 4 (2) ◽  
pp. 612-621 ◽  
Author(s):  
Graeme Nawn ◽  
Simon R. Oakley ◽  
Marek B. Majewski ◽  
Robert McDonald ◽  
Brian O. Patrick ◽  
...  
Keyword(s):  
Near Infrared ◽  
Chelate Complexes ◽  
Redox Active ◽  
Boron Chelate Complexes ◽  
Boron Chelate

scholarly journals Electrochemically addressable trisradical rotaxanes organized within a metal–organic framework

2015 ◽  
Vol 112 (36) ◽  
pp. 11161-11168 ◽  
Author(s):  
Paul R. McGonigal ◽  
Pravas Deria ◽  
Idan Hod ◽  
Peyman Z. Moghadam ◽  
Alyssa-Jennifer Avestro ◽  
...  
Keyword(s):  
Solid State ◽  
Near Infrared ◽  
De Novo ◽  
Metal Organic Framework ◽  
Paramagnetic Resonance ◽  
Interlocked Molecules ◽  
Redox Active ◽  
Metal Organic ◽  
Electron Paramagnetic ◽  
Organic Framework

The organization of trisradical rotaxanes within the channels of a Zr6-based metal–organic framework (NU-1000) has been achieved postsynthetically by solvent-assisted ligand incorporation. Robust ZrIV–carboxylate bonds are forged between the Zr clusters of NU-1000 and carboxylic acid groups of rotaxane precursors (semirotaxanes) as part of this building block replacement strategy. Ultraviolet–visible–near-infrared (UV-Vis-NIR), electron paramagnetic resonance (EPR), and 1H nuclear magnetic resonance (NMR) spectroscopies all confirm the capture of redox-active rotaxanes within the mesoscale hexagonal channels of NU-1000. Cyclic voltammetry measurements performed on electroactive thin films of the resulting material indicate that redox-active viologen subunits located on the rotaxane components can be accessed electrochemically in the solid state. In contradistinction to previous methods, this strategy for the incorporation of mechanically interlocked molecules within porous materials circumvents the need for de novo synthesis of a metal–organic framework, making it a particularly convenient approach for the design and creation of solid-state molecular switches and machines. The results presented here provide proof-of-concept for the application of postsynthetic transformations in the integration of dynamic molecular machines with robust porous frameworks.

Crown ether derivatives of squaraine: new near-infrared-absorbing, redox-active fluoroionophores for alkali metal recognition

1995 ◽  
Vol 32 (6) ◽  
pp. 213 ◽  
Author(s):  
Suresh Das ◽  
K. George Thomas ◽  
K. J. Thomas ◽  
M. V. George ◽  
I. Bedja ◽  
...  
Keyword(s):  
Crown Ether ◽  
Alkali Metal ◽  
Near Infrared ◽  
Redox Active ◽  
Metal Recognition ◽  
Derivatives Of

Electropolymerized films of redox-active ruthenium complexes for multistate near-infrared electrochromism, ion sensing, and information storage

2016 ◽  
Vol 27 (8) ◽  
pp. 1105-1114 ◽  
Author(s):  
Jiang-Yang Shao ◽  
Chang-Jiang Yao ◽  
Bin-Bin Cui ◽  
Zhong-Liang Gong ◽  
Yu-Wu Zhong
Keyword(s):  
Near Infrared ◽  
Ruthenium Complexes ◽  
Information Storage ◽  
Ion Sensing ◽  
Redox Active

Photo- and Redox-active Benzofuran-appended Triphenylamine and Near-infrared Absorption of Its Radical Cation

2020 ◽  
Vol 49 (6) ◽  
pp. 685-688
Author(s):  
Masafumi Yano ◽  
Yoshinori Inada ◽  
Yuki Hayashi ◽  
Tatsuo Yajima ◽  
Koichi Mitsudo ◽  
...  
Keyword(s):  
Radical Cation ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Redox Active

scholarly journals Low-temperature photochemistry in photosystem II from Thermosynechococcus elongatus induced by visible and near-infrared light

2007 ◽  
Vol 363 (1494) ◽  
pp. 1203-1210 ◽  
Author(s):  
Alain Boussac ◽  
Miwa Sugiura ◽  
Thanh-Lan Lai ◽  
A. William Rutherford
Keyword(s):  
Photosystem Ii ◽  
Water Oxidation ◽  
Near Infrared ◽  
Infrared Light ◽  
Tyrosyl Radical ◽  
Paramagnetic Resonance ◽  
Near Infrared Light ◽  
Redox Active ◽  
Electron Paramagnetic ◽  
Haem Iron

The active site for water oxidation in photosystem II (PSII) consists of a Mn 4 Ca cluster close to a redox-active tyrosine residue (TyrZ). The enzyme cycles through five sequential oxidation states (S 0 to S 4 ) in the water oxidation process. Earlier electron paramagnetic resonance (EPR) work showed that metalloradical states, probably arising from the Mn 4 cluster interacting with TyrZ, can be trapped by illumination of the S 0 , S 1 and S 2 states at cryogenic temperatures. The EPR signals reported were attributed to S 0 TyrZ, S 1 TyrZ and S 2 TyrZ, respectively. The equivalent states were examined here by EPR in PSII isolated from Thermosynechococcus elongatus with either Sr or Ca associated with the Mn 4 cluster. In order to avoid spectral contributions from the second tyrosyl radical, TyrD, PSII was used in which Tyr160 of D2 was replaced by phenylalanine. We report that the metalloradical signals attributed to TyrZ interacting with the Mn cluster in S 0 , S 1 , S 2 and also probably the S 3 states are all affected by the presence of Sr. Ca/Sr exchange also affects the non-haem iron which is situated approximately 44 Å units away from the Ca site. This could relate to the earlier reported modulation of the potential of Q A by the occupancy of the Ca site. It is also shown that in the S 3 state both visible and near-infrared light are able to induce a similar Mn photochemistry.

Nanocrystalline Sb-doped SnO2 films modified with cyclometalated ruthenium complexes for two-step electrochromism

2019 ◽  
Vol 48 (6) ◽  
pp. 2197-2205 ◽  
Author(s):  
Zhi-Juan Li ◽  
Jiang-Yang Shao ◽  
Si-Hai Wu ◽  
Yu-Wu Zhong
Keyword(s):  
Near Infrared ◽  
Contrast Ratio ◽  
Ruthenium Complexes ◽  
Infrared Region ◽  
Rapid Response ◽  
Redox Active ◽  
Near Infrared Region ◽  
Good Contrast

Sb-Doped SnO2 films modified with redox-active cyclometalated ruthenium complexes show two-step electrochromism in the near infrared region with a rapid response and good contrast ratio.

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