scholarly journals Complexation Behavior of Pinene–Bipyridine Ligands towards Lanthanides: The Influence of the Carboxylic Arm

Chemistry ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 18-30
Author(s):  
Atena B. Solea ◽  
Liangru Yang ◽  
Aurelien Crochet ◽  
Katharina M. Fromm ◽  
Christophe Allemann ◽  
...  
Keyword(s):  
Fluorescence Spectroscopy ◽  
Metal Chelate ◽  
Association Constants ◽  
Spectroscopic Methods ◽  
Additional Information ◽  
Mononuclear Complexes ◽  
First Case ◽  
Methylene Unit ◽  
Chelate Rings

The complexation behavior of two novel, chiral pinene–bipyridine-type ligands ((–)-HL1 and (–)-HL2) containing a carboxylic arm towards lanthanide Ln(III) (Ln = La, Eu, Lu) ions was investigated through spectroscopic methods. The association constants of the mononuclear complexes determined from the UV-Vis titrations indicated that the ligand (–)-HL1 possessing a shorter carboxylic arm formed more stable complexes compared with (–)-HL2, whose carboxylic arm had one more methylene unit. This is due to the formation of more stable seven-member metal chelate rings in the first case as compared with the eight-member metal chelate rings in the second. IR and fluorescence spectroscopy provided additional information about the structure of these complexes.

Significance of analysis of the mechanism of fingermarks formation, sizes and location – casework examples

2018 ◽  
Vol 301 ◽  
pp. 44-52
Author(s):  
Tomasz Kowalski ◽  
Keyword(s):  
Significant Role ◽  
Special Interest ◽  
The Other ◽  
Fatal Accident ◽  
Preliminary Stage ◽  
Additional Information ◽  
Expert Opinions ◽  
First Case ◽  
Initial Stage

The aim of the article to present the role of analysing the manner of generating fingermarks in the investigative proceedings. These examinations are based on the analysis of the location of the marks on a given background and aim at providing the requesting party additional information about the circumstances of the investigated incident. The Author refers to two unusual cases, in which Voivodeship Police Command Forensic Laboratory issued expert opinions in the area of fingerprint identification. In the first case, at the initial stage of the proceedings the circumstances and recovered evidential fingermarks indicated a fatal accident or manslaughter by means of a firearm. In the other case at the preliminary stage recovered evidence did not allow identification of the perpetrator due to incorrectly selected exhibits. These cases would not be off special interest to us without the significant role of proper recovering of fingermarks and their analysis in a broader context than just identification.

Conformational analysis of EDTA-type chromium(III) complexes with β-propionato metal chelate rings

2002 ◽  
Vol 609 (1-3) ◽  
pp. 1-9 ◽  
Author(s):  
Sonja Grubišić ◽  
Maja Gruden ◽  
S.R. Niketić ◽  
Narumi Sakagami- Yoshida ◽  
Sumio Kaizaki
Keyword(s):  
Conformational Analysis ◽  
Metal Chelate ◽  
Chelate Rings

scholarly journals Strong stacking interactions of metal–chelate rings are caused by substantial electrostatic component

2019 ◽  
Vol 48 (19) ◽  
pp. 6328-6332 ◽  
Author(s):  
Dušan P. Malenov ◽  
Snežana D. Zarić
Keyword(s):  
Metal Chelate ◽  
Electrostatic Energy ◽  
Stacking Interactions ◽  
Energy Component ◽  
Electrostatic Component ◽  
Chelate Rings

Stacking interactions of metal–chelate rings are strong due to very strong electrostatic energy component.

The Chemistry of Metal Chelate Rings. IV. Electrophilic Substitution of Optically Active Tris-acetylacetonates

1963 ◽  
Vol 2 (3) ◽  
pp. 576-580 ◽  
Author(s):  
James P. Collman ◽  
Robert P. Blair ◽  
Roger L. Marshall ◽  
Laird Slade
Keyword(s):  
Electrophilic Substitution ◽  
Metal Chelate ◽  
Optically Active ◽  
Chelate Rings

Cepaciachelin, A New Catecholate Siderophore From Burkholderia (Pseudomonas) Cepacia ***

1996 ◽  
Vol 51 (9-10) ◽  
pp. 627-630 ◽  
Author(s):  
I. Barelmann ◽  
J.-M. Meyer ◽  
K. Taraz ◽  
H. Budzikiewicz
Keyword(s):  
Chemical Degradation ◽  
Pseudomonas Cepacia ◽  
Spectroscopic Methods ◽  
First Case ◽  
Hydroxamate Siderophores

In addition to the known hydroxamate siderophores ornibactin C6 and C8 a catecholate siderophore named cepaciachelin, 1-N-[2-N′,6-N′-di(2,3-dihydroxybenzoyl)-ʟ-lysyl]-1,4-diaminobutane, was isolated from a Burkholderia (Pseudomonas) cepacia PHP7 culture and its structure elucidated by chemical degradation and spectroscopic methods. This is the first case of a member of the Pseudomonas group which produces both hydroxamate and catecholate siderophores

Disubstituted hydroxamic acids and the determination of vanadium

1968 ◽  
Vol 46 (2) ◽  
pp. 327-330 ◽  
Author(s):  
R. M. Cassidy ◽  
D. E. Ryan
Keyword(s):  
Extinction Coefficient ◽  
Metal Chelate ◽  
Visible Region ◽  
Hydroxamic Acids ◽  
Molecular Extinction Coefficient ◽  
Sensitivity Increase ◽  
Chelate Rings

A number of disubstituted hydroxamic acids were investigated as possible replacements for benzoylphenylhydroxylamine in the determination of vanadium; none is superior. At 378 mμ., p-phenylazobenzoylphenylhydroxylamine shows a marked sensitivity increase but selectivity is poor. In the visible region, there is an increase in molecular extinction coefficient as the reagent π system is extended; how ever, complete coplanarity of the aromatic and metal chelate rings is not possible and the increase is not large enough to be of much practical value.

scholarly journals Economic Evaluation Applied to Health Policy in New Zealand

2021 ◽  
Author(s):  
◽  
William Guy Scott
Keyword(s):  
Health Policy ◽  
Hospital Admissions ◽  
Disease Incidence ◽  
Incidence Rates ◽  
Data Set ◽  
Aggregated Data ◽  
Study Approach ◽  
Incidence Data ◽  
Additional Information ◽  
First Case

<p>Data available in the public domain are frequently aggregated to preserve confidentiality and to reduce a database to a manageable size. Drawing conclusions from such data may lead to inappropriate policy advice. The aims of this paper are to show how the aggregation of data to form rates may obscure important information and lead to misinterpretation of results. Suggestions are offered on ways in which this problem may be addressed. We also highlight the need to seek additional information in order to clarify findings. We used a case study approach by drawing on illustrative examples to highlight some problems encountered when using aggregated data about population. The focus is on health policy. Two types of problem were discussed in the cases chosen, but a common resolution was appropriate. In the first case policies based on the assumption that hospital admissions equate with disease incidence would be different from policies framed on actual incidence data. In the second, incidence rates changed when they were disaggregated to gender and age-specific rates. Policies formulated from analysis of aggregated data would be different form those based on disaggregated data. In the cases studied, the variables of gender, age and ethnicity influence incidence rates and must not be ignored. Researchers are recommended to study the data-set in the most disaggregated form available, and to check how data have been defined, collected and recorded, before preparing summary tables and graphs. Additional research or data from another source may be needed to clarify findings.</p>

scholarly journals Economic Evaluation Applied to Health Policy in New Zealand

2021 ◽  
Author(s):  
◽  
William Guy Scott
Keyword(s):  
Health Policy ◽  
Hospital Admissions ◽  
Disease Incidence ◽  
Incidence Rates ◽  
Data Set ◽  
Aggregated Data ◽  
Study Approach ◽  
Incidence Data ◽  
Additional Information ◽  
First Case

<p>Data available in the public domain are frequently aggregated to preserve confidentiality and to reduce a database to a manageable size. Drawing conclusions from such data may lead to inappropriate policy advice. The aims of this paper are to show how the aggregation of data to form rates may obscure important information and lead to misinterpretation of results. Suggestions are offered on ways in which this problem may be addressed. We also highlight the need to seek additional information in order to clarify findings. We used a case study approach by drawing on illustrative examples to highlight some problems encountered when using aggregated data about population. The focus is on health policy. Two types of problem were discussed in the cases chosen, but a common resolution was appropriate. In the first case policies based on the assumption that hospital admissions equate with disease incidence would be different from policies framed on actual incidence data. In the second, incidence rates changed when they were disaggregated to gender and age-specific rates. Policies formulated from analysis of aggregated data would be different form those based on disaggregated data. In the cases studied, the variables of gender, age and ethnicity influence incidence rates and must not be ignored. Researchers are recommended to study the data-set in the most disaggregated form available, and to check how data have been defined, collected and recorded, before preparing summary tables and graphs. Additional research or data from another source may be needed to clarify findings.</p>

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