Critical Role of External Axial Ligands in Chirality Amplification oftrans-Cyclohexane-1,2-diamine in Salen Complexes

2009 ◽  
Vol 131 (34) ◽  
pp. 12394-12405 ◽  
Author(s):  
Takuya Kurahashi ◽  
Masahiko Hada ◽  
Hiroshi Fujii
Keyword(s):  
Critical Role ◽  
Axial Ligands ◽  
Salen Complexes

scholarly journals Octahedral Co(III) salen complexes: the role of peripheral ligand electronics on axial ligand release upon reduction

2018 ◽  
Vol 96 (2) ◽  
pp. 110-118 ◽  
Author(s):  
Chen Zhang ◽  
Mathew Sutherland ◽  
Khrystyna Herasymchuk ◽  
Ryan M. Clarke ◽  
John R. Thompson ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Reduction Potential ◽  
Reduction Process ◽  
Axial Ligand ◽  
Lewis Acidity ◽  
Dominant Factor ◽  
Axial Ligands ◽  
Salen Complexes ◽  
Reducing Conditions

A series of octahedral CoIII salen complexes (where salen represents a N2O2 bis-Schiff-base bis-phenolate framework) were prepared with axial imidazole ligating groups. When using 1-methylimidazole (1-MeIm) axial ligands, the CoIII/CoII reduction potential could be altered by 220 mV via variation of the electron-donating ability of the para-ring substituents (R = H (1), OMe (2), tBu (3), Br (4), NO2 (5), and CF3 (6)). In addition, the irreversibility of the reduction process suggested substantial geometrical changes and axial ligand exchange upon reduction to the more labile CoII oxidation state. Installing an imidazole-coumarin conjugate as the axial ligands resulted in fluorescence quenching when bound to the CoIII centre (R = H (7), OMe (8), and CF3 (9)). The redox properties and fluorescence increase upon ligand release for 7–9 were studied under reducing conditions and in the presence of excess competing ligand (1-MeIm). It was determined that the Lewis acidity of the CoIII centre was the dominant factor in controlling axial ligand exchange for this series of complexes.

The Role of the SLP in Autism Spectrum Disorder Screening and Assessment

2008 ◽  
Vol 15 (2) ◽  
pp. 50-59 ◽  
Author(s):  
Amy Philofsky
Keyword(s):  
Language Development ◽  
Critical Role ◽  
Children With Autism ◽  
Autism Spectrum ◽  
Children With Asd ◽  
Prevalence Estimates ◽  
Notable Increase ◽  
Screening Assessment ◽  
Critical Components

AbstractRecent prevalence estimates for autism have been alarming as a function of the notable increase. Speech-language pathologists play a critical role in screening, assessment and intervention for children with autism. This article reviews signs that may be indicative of autism at different stages of language development, and discusses the importance of several psychometric properties—sensitivity and specificity—in utilizing screening measures for children with autism. Critical components of assessment for children with autism are reviewed. This article concludes with examples of intervention targets for children with ASD at various levels of language development.

A critical role of iNOS-derived Nitric Oxide (NO) and progesterone in implantation

1998 ◽  
Vol 5 (1) ◽  
pp. 115A-115A
Author(s):  
K CHWALISZ ◽  
E WINTERHAGER ◽  
T THIENEL ◽  
R GARFIELD
Keyword(s):  
Nitric Oxide ◽  
Critical Role

Bridging the Gap between Ethical Climate and Nurses’ Service Behaviors: the Critical Role of Professional Well-Being

2018 ◽  
Vol 20 (3) ◽  
pp. 99-110
Author(s):  
Na Zhang ◽  
Jingjing Li ◽  
Xing Bu ◽  
Zhenxing Gong ◽  
Gilal Faheem Gul
Keyword(s):  
Ethical Climate ◽  
Critical Role ◽  
Well Being

Bridging the Knowledge Gaps in Arrhythmogenic Cardiovascular Conditions: The Critical Role of Registries

2016 ◽  
Vol 10 (2) ◽  
pp. 1 ◽  
Author(s):  
Melody Hermel ◽  
Rebecca Duffy ◽  
Alexander Orfanos ◽  
Isabelle Hack ◽  
Shayna McEnteggart ◽  
...  
Keyword(s):  
Clinical Trials ◽  
Natural History ◽  
Risk Stratification ◽  
Critical Role ◽  
Knowledge Gaps ◽  
Level Of Evidence ◽  
The Future

Cardiac registries have filled many gaps in knowledge related to arrhythmogenic cardiovascular conditions. Despite the less robust level of evidence available in registries when compared with clinical trials, registries have contributed a range of clinically useful information. In this review, the authors discuss the role that registries have played – related to diagnosis, natural history, risk stratification, treatment, and genetics of arrhythmogenic cardiovascular conditions – in closing knowledge gaps, and their role in the future.

SELF-EXPRESSION THROUGH VOTING? THE CRITICAL ROLE OF LEADER BRAND PERSONALITY

2018 ◽  
Vol 2018 ◽  
pp. 1004-1014
Author(s):  
Sofia Batsila ◽  
◽  
George Panigyrakis ◽  
Anastasios Panopoulos
Keyword(s):  
Brand Personality ◽  
Critical Role
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