scholarly journals Design and reactivity of pentapyridyl metal complexes for ammonia oxidation

2019 ◽  
Vol 55 (35) ◽  
pp. 5083-5086 ◽  
Author(s):  
Samantha I. Johnson ◽  
Spencer P. Heins ◽  
Christina M. Klug ◽  
Eric S. Wiedner ◽  
R. Morris Bullock ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Experimental Work ◽  
Ammonia Oxidation ◽  
Chemical Mediator

Computational and experimental work shows that Mo pentapyridal complexes can oxidize ammonia in the presence of a chemical mediator and evolve N2.

Chemical reactivities of tetrapyrrole pigments: a comparison of experimental behaviour with the results of s.c.f.-π-m.o. calculations

1976 ◽  
Vol 273 (924) ◽  
pp. 335-352 ◽  
Keyword(s):  
Metal Ions ◽  
Metal Complexes ◽  
Experimental Work ◽  
Oxidation Potential ◽  
Central Metal ◽  
Reversible Reactions ◽  
Specific Reactivity ◽  
Cleavage Reactions ◽  
Recent Experimental Work ◽  
Experimental Behaviour

Porphyrins are highly σ-electron donating bases and very weak π-acids. Hence they increase the electron density on central metal ions, e.g. iron, which leads to the specific reactivity of haem cytochromes, haemoglobin and oxidizing enzymes. The macrocyclic chlorin ligand behaves similarly but to a lesser degree which explains the comparably low oxidation potential of chlorophyll. Phlorins, oxophlorins, oxa- and aza-porphyrins, tetradehydrocorrins, corrins and biliverdins all produce metal complexes which have a similar geometry to that of metalloporphyrins, but their reactivity patterns are different. In contrast to themetalloporphyrins which undergo many fully reversible reactions, these compounds tend to irreversible addition and cleavage reactions. These tetrapyrrole ligands are stronger π-acids than porphyrins. Results of some recent experimental work and π-electron s.c.f. calculations are presented in support of these generalizations.

Mechanochemical changes on cyclometalated Ir(iii) acyclic carbene complexes – design and tuning of luminescent mechanochromic transition metal complexes

2020 ◽  
Vol 7 (3) ◽  
pp. 786-794 ◽  
Author(s):  
Jingqi Han ◽  
Kin-Man Tang ◽  
Shun-Cheung Cheng ◽  
Chi-On Ng ◽  
Yuen-Kiu Chun ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Carbene Complexes ◽  
New Class

A new class of luminescent cyclometalated Ir(iii) complexes with readily tunable mechanochromic properties derived from the mechanically induced trans-to-cis isomerization have been developed.

Schiff base ligands derived from phenylenediamine and its metal complexes as enhancer against two mechanisms of antibiotic resistance

2019 ◽  
Author(s):  
NM Jaya ◽  
NH Ismail ◽  
ALM Low ◽  
H Bahron ◽  
PNAW Faizal ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Schiff Base ◽  
Metal Complexes ◽  
Schiff Base Ligands

Research into the Effect of Photometric Flicker Event on the Perception of Office Workers

2019 ◽  
pp. 22-27
Author(s):  
Cenk Yavuz ◽  
Ceyda Aksoy Tırmıkç ◽  
Burcu Çarklı Yavuz
Keyword(s):  
Experimental Work ◽  
Psychological Problems ◽  
Office Workers ◽  
Questionnaire Study ◽  
Fast Growing ◽  
Lighting Conditions ◽  
Lighting Systems ◽  
Enormous Number

Today the number of office workers has reached to an enormous number due to the fast-growing technology. Most of these office workers spend long hours in enclosed spaces with little/no daylight penetration. The lack of daylight causes physiological and psychological problems with the workers. At this point lighting systems become prominent as the source and the solution of the problem. Photometric flicker event which arises in the lighting systems can sometimes become visible and brings a lot of issues with it. In this paper, an experimental work has been done to investigate the effect of flicker. For this purpose, the flicker values of 3 different experiment rooms for different lighting conditions and scenarios have been measured and a questionnaire study has been carried out in the experiment rooms with 30 participants. In conclusion, the effect of the flicker event on the volunteers have been classified and some methods have been proposed not to experience flicker effects.

Reaction Mechanisms of Metal Complexes

2000 ◽  
Author(s):  
Robert W. Hay
Keyword(s):  
Metal Complexes ◽  
Reaction Mechanisms
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