scholarly journals Effect of Coordinating Solvents on the Structure of Cu(II)-4,4′-bipyridine Coordination Polymers

Inorganics ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 103 ◽  
Author(s):  
Marzio Rancan ◽  
Alice Carlotto ◽  
Gregorio Bottaro ◽  
Lidia Armelao
Keyword(s):  
Coordination Polymers ◽  
Crucial Role ◽  
Layered Networks ◽  
1D Chain

Solvent can play a crucial role in the synthesis of coordination polymers (CPs). Here, this study reports how the coordinating solvent approach (CSA) can be used as an effective tool to control the nature of the final CP. This study exploited the system Cu(II)-4,4′-bipyridine coupled to different coordinating solvents, such as DMA, DMF and DMSO. This allowed the isolation and structurally characterization of four new CPs: three 2D layered networks and one 1D chain. Moreover, it was evidenced that even adventitious water can play the role of the coordinating solvent in the final CP.

scholarly journals SARS-CoV-2 Virologic and Immunologic Correlates in Patients with Olfactory and Taste Disorders

2020 ◽  
Vol 8 (7) ◽  
pp. 1052
Author(s):  
Marco Benazzo ◽  
Irene Cassaniti ◽  
Eugenia Maiorano ◽  
Anna Calastri ◽  
Federica Novazzi ◽  
...  
Keyword(s):  
Median Time ◽  
Crucial Role ◽  
Great Majority ◽  
Molecular Assays ◽  
Nasal Swabs ◽  
Taste Disorders ◽  
Over Time

The main object of the study was to investigate the SARS-CoV-2 molecular and serological pattern in patients with mild symptoms including anosmia and ageusia. A cohort of 69 patients with olfactory and taste disorders (OTDs) were enrolled and prospectively monitored. Serological and molecular assays for the characterization of SARS-CoV-2 IgG and SARS-CoV-2 RNA, respectively, were performed at the time of enrolment and after 7 and 14 days. Patients were stratified according to the symptoms’ onset. A total of 52 patients (75.4%) were diagnosed as COVID-19 positive being SARS-CoV-2 RNA and/or SARS-CoV-2 IgG positive. The remaining 17 (24.6%) were negative for COVID-19 and excluded from the analysis. We reported that only 34 out of 52 patients (65.4%) were positive for SARS-CoV-2 RNA. Moreover, the median time from onset of symptoms and enrolment was significantly higher in those patients with negative SARS-CoV-2 RNA in nasal swabs, suggesting that symptoms might last longer than SARS-CoV-2 replication. The great majority of patients (80%) developed SARS-CoV-2 IgG at three weeks after symptoms’ onset while the detectability of SARS-CoV-2 RNA dramatically decreased over time, suggesting the crucial role of combination of molecular and serological assays for the diagnosis of COVID-19 in those patients reporting mild symptoms.

scholarly journals Optical properties and carrier dynamics in Co-doped ZnO nanorods

2021 ◽  
Vol 3 (1) ◽  
pp. 214-222
Author(s):  
Aswathi K. Sivan ◽  
Alejandro Galán-González ◽  
Lorenzo Di Mario ◽  
Nicolas Tappy ◽  
Javier Hernández-Ferrer ◽  
...  
Keyword(s):  
Optical Properties ◽  
Crucial Role ◽  
Surface Defects ◽  
Zno Nanorods ◽  
Carrier Dynamics ◽  
Photoelectrochemical Characterization ◽  
Doped Zno ◽  
Co Doped

Optoelectronic and photoelectrochemical characterization of Co-doped ZnO nanorods revealing the crucial role of surface defects for enhanced photoresponse.

scholarly journals Single-Ion Magnet and Photoluminescence Properties of Lanthanide(III) Coordination Polymers Based on Pyrimidine-4,6-Dicarboxylate

2021 ◽  
Vol 7 (1) ◽  
pp. 8
Author(s):  
Oier Pajuelo-Corral ◽  
Jose Angel García ◽  
Oscar Castillo ◽  
Antonio Luque ◽  
Antonio Rodríguez-Diéguez ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Single Molecule ◽  
Visible Region ◽  
Emission Spectra ◽  
Lanthanide Ions ◽  
Quantum Yields ◽  
Nitrate Anion ◽  
Absolute Quantum

Herein, we report the magnetic and photoluminescence characterization of coordination polymers (CP) built from the combination of lanthanide(III) ions, pyrimidine-4,6-dicarboxylate (pmdc) ligand and a co-ligand with formula {[Dy(μ-pmdc)(μ-ox)0.5(H2O)3]·2H2O}n (1-Dy), {[Dy(μ3-pmdc)(μ-ox)0.5(H2O)2] ~2.33H2O}n (2-Dy), {[Dy2(μ3-pmdc)(μ4-pmdc)(μ-ox)(H2O)3]·5H2O}n (3-Dy), {[Ln(μ3-pmdc)(μ-ox)0.5(H2O)2]·H2O}n (where Ln(III) = Nd (4-Nd), Sm (4-Sm), Eu (4-Eu) and Dy (4-Dy)) and {[Dy(μ4-pmdc)(NO3)(H2O)]·H2O}n (5-Dy). It must be noted the presence of oxalate anion acting as ditopic co-ligand in compounds 1-Dy, 2-Dy, 3-Dy and 4-Ln, whereas in 5-Dy the nitrate anion plays the role of terminal co-ligand. Direct current measurements carried out for the dysprosium-based CPs reveal almost negligible interactions between Dy3+ ions within the crystal structure, which is confirmed by computed values of the exchange parameters J. In addition, alternating current measurements show field-induced single-molecule magnet (SMM) behavior in compounds 1-Dy, 2-Dy, 4-Dy and 5-Dy, whereas slight-frequency dependence is also observed in 3-Dy. Solid state emission spectra performed at room temperature for those compounds emitting in visible region confirm the occurrence of significant ligand-to-lanthanide charge transfer in view of the strong characteristic emissions for all lanthanide ions. Emission decay curves were also recorded to estimate the emission lifetimes for the reported compounds, in addition to the absolute quantum yields. Among them, the high quantum yield of 25.0% measured for 4-Eu is to be highlighted as a representative example of the good emissive properties of the materials.

The ability of the NiSOD binding loop to chelate zinc(ii): the role of the terminal amino group in the enzymatic functions

2019 ◽  
Vol 48 (18) ◽  
pp. 6217-6227 ◽  
Author(s):  
Gizella Csire ◽  
András Kolozsi ◽  
Tamás Gajda ◽  
Giuseppe Pappalardo ◽  
Katalin Várnagy ◽  
...  
Keyword(s):  
Crucial Role ◽  
Spectroscopic Characterization ◽  
Amino Group ◽  
Amino Groups ◽  
Enzymatic Function ◽  
Terminal Amino ◽  
Binding Loop

Equilibrium and spectroscopic characterization of zinc(ii) complexes with NiSOD related peptides highlights the crucial role of terminal amino groups in the enzymatic function.

scholarly journals Frontispiece: Growth and Atomic‐Scale Characterization of Ultrathin Silica and Germania Films: The Crucial Role of the Metal Support

2021 ◽  
Vol 27 (6) ◽  
Author(s):  
Adrián Leandro Lewandowski ◽  
Sergio Tosoni ◽  
Leonard Gura ◽  
Zechao Yang ◽  
Alexander Fuhrich ◽  
...  
Keyword(s):  
Crucial Role ◽  
Atomic Scale ◽  
Metal Support ◽  
Scale Characterization

scholarly journals Growth and Atomic‐Scale Characterization of Ultrathin Silica and Germania Films: The Crucial Role of the Metal Support

2020 ◽  
Author(s):  
Adrián Leandro Lewandowski ◽  
Sergio Tosoni ◽  
Leonard Gura ◽  
Zechao Yang ◽  
Alexander Fuhrich ◽  
...  
Keyword(s):  
Crucial Role ◽  
Atomic Scale ◽  
Metal Support ◽  
Scale Characterization

Superstatistics and renewal critical events

Open Physics ◽  
2009 ◽  
Vol 7 (3) ◽  
Author(s):  
Paolo Paradisi ◽  
Rita Cesari ◽  
Paolo Grigolini
Keyword(s):  
Crucial Role ◽  
Waiting Times ◽  
Poisson Model ◽  
Critical Events ◽  
Periodic Forcing ◽  
Poisson Statistics ◽  
Aging Property ◽  
Intensive Parameter

AbstractAn approach to intermittent systems based on renewal processes is reviewed. The Waiting Times (WTs) between events are the main variables of interest in intermittent systems. A crucial role is played by the class of critical events, characterized by Non-Poisson statistics and non-exponential WT distribution. A particular important case is given by WT distributions with power tail. Critical events play a crucial role in the behavior of a property known as Renewal Aging. Focusing on the role of critical events, the relation between superstatistics and non-homogeneous Poisson processes is discussed, and the role of Renewal Aging is illustrated by comparing a Non-Poisson model with a Poisson one, both of them modulated by a periodic forcing. It is shown that the analysis of Renewal Aging is sensitive to the presence of critical events and that this property can be exploited to detect Non-Poisson statistics in a time series. As a consequence, it is claimed that, apart from the characterization of superstatistical features such as the distribution of the intensive parameter or the separation of the time scales, the Renewal Aging property can give some effort to better determine the role of Non-Poisson critical events in intermittent systems.

scholarly journals Evidence of the crucial role of the linker domain on the catalytic activity of human topoisomerase I by experimental and simulative characterization of the Lys681Ala mutant

2009 ◽  
Vol 37 (20) ◽  
pp. 6849-6858 ◽  
Author(s):  
Paola Fiorani ◽  
Cinzia Tesauro ◽  
Giordano Mancini ◽  
Giovanni Chillemi ◽  
Ilda D'A;nnessa ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Crucial Role ◽  
Topoisomerase I ◽  
Linker Domain
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