In air a spin crossover active iron(ii) complex of amine/NCBH3− ligands is converted to a low spin complex of imine/CN− ligands

2015 ◽  
Vol 44 (47) ◽  
pp. 20551-20561 ◽  
Author(s):  
Jian Zhou ◽  
Bo-Wen Zhu ◽  
Jie Luan ◽  
Zhan Liu ◽  
Jing-Kun Fang ◽  
...  
Keyword(s):  
Oxidative Dehydrogenation ◽  
Spin Crossover ◽  
Tetradentate Ligand ◽  
Active Iron ◽  
Spin Complex

A spin crossover FeII complex is in situ converted to a low spin complex in the presence of air, induced by the oxidative dehydrogenation of the tetradentate ligand and the generation of CN− from NCBH3−.

scholarly journals Spin Crossover in Nickel(II) Tetraphenylporphyrinate via Forced Axial Coordination at the Air/Water Interface

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4155
Author(s):  
Alexander V. Shokurov ◽  
Daria S. Kutsybala ◽  
Andrey P. Kroitor ◽  
Alexander A. Dmitrienko ◽  
Alexander G. Martynov ◽  
...  
Keyword(s):  
Spin State ◽  
Spin Crossover ◽  
High Spin State ◽  
Water Interface ◽  
Metal Centers ◽  
Axial Coordination ◽  
Vis Spectroscopy ◽  
Air Water Interface ◽  
Nickel Cation

Coordination-induced spin crossover (CISCO) in nickel(II) porphyrinates is an intriguing phenomenon that is interesting from both fundamental and practical standpoints. However, in most cases, realization of this effect requires extensive synthetic protocols or extreme concentrations of extra-ligands. Herein we show that CISCO effect can be prompted for the commonly available nickel(II) tetraphenylporphyrinate, NiTPP, upon deposition of this complex at the air/water interface together with a ruthenium(II) phthalocyaninate, CRPcRu(pyz)2, bearing two axial pyrazine ligands. The latter was used as a molecular guiderail to align Ni···Ru···Ni metal centers for pyrazine coordination upon lateral compression of the system, which helps bring the two macrocycles closer together and forces the formation of Ni–pyz bonds. The fact of Ni(II) porphyrinate switching from low- to high-spin state upon acquiring additional ligands can be conveniently observed in situ via reflection-absorption UV-vis spectroscopy. The reversible nature of this interaction allows for dissociation of Ni–pyz bonds, and thus, change of nickel cation spin state, upon expansion of the monolayer.

In Situ Environmental STEM Study of the MoVTe Oxide M1 Phase Catalysts for Ethane Oxidative Dehydrogenation

ACS Catalysis ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 4775-4781 ◽  
Author(s):  
Mimoun Aouine ◽  
Thierry Epicier ◽  
Jean-Marc M. Millet
Keyword(s):  
Oxidative Dehydrogenation ◽  
M1 Phase ◽  
Ethane Oxidative Dehydrogenation

scholarly journals Investigation of the Deactivation Phenomena Occurring in the Cyclohexane Photocatalytic Oxidative Dehydrogenation on MoOx/TiO2 through Gas Phase and in situ DRIFTS Analyses

Catalysts ◽  
2013 ◽  
Vol 3 (4) ◽  
pp. 978-997 ◽  
Author(s):  
Vincenzo Vaiano ◽  
Diana Sannino ◽  
Ana Almeida ◽  
Guido Mul ◽  
Paolo Ciambelli
Keyword(s):  
Gas Phase ◽  
Oxidative Dehydrogenation ◽  
In Situ Drifts

Hydrophobic tail length in spin crossover active iron(ii) complexes predictably tunes T½ in solution and enables surface immobilisation

2020 ◽  
Vol 7 (10) ◽  
pp. 2050-2059
Author(s):  
Sriram Sundaresan ◽  
Jonathan A. Kitchen ◽  
Sally Brooker
Keyword(s):  
Spin State ◽  
Linear Correlation ◽  
Convenient Method ◽  
Spin Crossover ◽  
Tail Length ◽  
Active Iron ◽  
Hydrophobic Tail ◽  
Switching Temperature ◽  
Alkyl Tail

Linear correlation of the hydrophobic alkyl tail length R employed in [FeII(LH-OR)(NCBH3)2] with the spin crossover switching temperature is a very convenient method of predictably tuning the iron(ii) spin state.

Co–Co and Co–Fe cyano-bridged pentanuclear clusters based on a methylpyrazinyl-diamine tetradentate ligand: spin crossover and metal substitution effects

CrystEngComm ◽  
2017 ◽  
Vol 19 (47) ◽  
pp. 7079-7082 ◽  
Author(s):  
Bin Fei ◽  
Jian Zhou ◽  
Zheng Yan ◽  
Sergii I. Shylin ◽  
Vadim Ksenofontov ◽  
...  
Keyword(s):  
Solvothermal Synthesis ◽  
Spin Crossover ◽  
Degree Of Substitution ◽  
Substitution Effects ◽  
Cluster Complex ◽  
Tetradentate Ligand ◽  
Metal Substitution

A pentanuclear [CoII3CoIII2] cluster complex has been developed by a solvothermal synthesis. Its highly stable metal-mixed Fe–Co derivatives display robust spin crossover (T1/2 = 268 K) controlled by the degree of substitution.

scholarly journals In situ spectroscopic investigation of oxidative dehydrogenation and disproportionation of benzyl alcohol

2013 ◽  
Vol 15 (29) ◽  
pp. 12147 ◽  
Author(s):  
Ewa Nowicka ◽  
Jan P. Hofmann ◽  
Stewart F. Parker ◽  
Meenakshisundaram Sankar ◽  
Giacomo M. Lari ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Oxidative Dehydrogenation ◽  
Spectroscopic Investigation
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