scholarly journals X-Ray Crystallographic Analysis, EPR Studies, and Computational Calculations of a Cu(II) Tetramic Acid Complex

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Dimitrios Matiadis ◽  
Dimitrios Tsironis ◽  
Valentina Stefanou ◽  
Olga Igglessi–Markopoulou ◽  
Vickie McKee ◽  
...  
Keyword(s):  
Self Assembly ◽  
Copper Ions ◽  
Copper Ion ◽  
Spectroscopic Properties ◽  
Crystallographic Analysis ◽  
Computational Techniques ◽  
Tetramic Acid ◽  
Acid Complex ◽  
X Ray ◽  
Computational Calculations

In this work we present a structural and spectroscopic analysis of a copper(II) N-acetyl-5-arylidene tetramic acid by using both experimental and computational techniques. The crystal structure of the Cu(II) complex was determined by single crystal X-ray diffraction and shows that the copper ion lies on a centre of symmetry, with each ligand ion coordinated to two copper ions, forming a 2D sheet. Moreover, the EPR spectroscopic properties of the Cu(II) tetramic acid complex were also explored and discussed. Finally, a computational approach was performed in order to obtain a detailed and precise insight of product structures and properties. It is hoped that this study can enrich the field of functional supramolecular systems, giving place to the formation of coordination-driven self-assembly architectures.

Imidazole/benzimidazole-modified cyclotriphosphazenes as highly selective fluorescent probes for Cu2+: synthesis, configurational isomers, and crystal structures

2017 ◽  
Vol 46 (28) ◽  
pp. 9140-9156 ◽  
Author(s):  
Aylin Uslu ◽  
Süreyya Oğuz Tümay ◽  
Ahmet Şenocak ◽  
Fatma Yuksel ◽  
Elif Özcan ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Fluorescent Probes ◽  
Copper Ion ◽  
Crystallographic Analysis ◽  
Ion Detection ◽  
X Ray

We present a comprehensive work and discuss the fluoroprobe properties of synthesized compounds for copper ion detection with a stereochemical approach using X-ray crystallographic analysis results.

X-ray structures and spectroscopic properties of chiral thiosemicarbazides as studied by computational calculations

2017 ◽  
Vol 192 (7) ◽  
pp. 856-865 ◽  
Author(s):  
Sibel Demir Kanmazalp ◽  
Eyüp Başaran ◽  
Ayşegül Karaküçük-Iyidoğan ◽  
Emine Elçin Oruç-Emre ◽  
Necmi Dege
Keyword(s):  
Spectroscopic Properties ◽  
X Ray ◽  
Computational Calculations

scholarly journals Chiral Cyclic [n]Spirobifluorenylenes: Carbon Nanorings Consisting of Helically Arranged Quaterphenyl Rods Illustrating Partial Units of Woven Patterns

2020 ◽  
Author(s):  
Kaige Zhu, ◽  
Kosuke Kamochi ◽  
Takuya Kodama ◽  
Mamoru Tobisu ◽  
Toru Amaya
Keyword(s):  
Building Blocks ◽  
Spectroscopic Properties ◽  
Crystallographic Analysis ◽  
Quantum Yields ◽  
X Ray ◽  
New Family ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
Yamamoto Coupling ◽  
Carbon Nanorings

Chiral cyclic [n]spirobifluorenylenes consisting of helically arranged quaterphenyl rods, illustrating partial units of woven patterns, were designed and synthesized as a new family of carbon nanorings. The synthesis was accomplished by the Ni(0)-mediated Yamamoto-coupling of chiral spirobifluorene building blocks. The structures of the cyclic 3-, 4-, and 5-mers were determined by X-ray crystallographic analysis. These carbon nanorings exhibited a strong violet colored emission with high quantum yields in solution (95%, 93%, and 94% for 3-, 4-, and 5-mer, respectively). Other spectroscopic properties, including their chiroptical properties, were also investigated. The g-values for circularly polarized luminescence were found to be in the order of 10<sup>-3</sup>, where that of the 4-mer showed a relatively higher value 8.5 x 10<sup>-3</sup>. Characteristic spiroconjugation induced by multiple<br>3) bifluorenyl units, for example the even-odd effect of the number of units in the matching of the sign of the orbitals, were also indicated by DFT calculations.<br>

scholarly journals A Disposable Copper (II) Ion Biosensor Based on Self-Assembly of L-Cysteine on Gold Nanoparticle-Modified Screen-Printed Carbon Electrode

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Wong Pooi See ◽  
Sheila Nathan ◽  
Lee Yook Heng
Keyword(s):  
Gold Nanoparticle ◽  
Self Assembly ◽  
Copper Ions ◽  
Effective Means ◽  
Copper Ion ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Preconcentration Time ◽  
Screen Printed

A disposable copper (II) ion biosensor based on self-assembly of L-cysteine on gold nanoparticle-modified screen-printed carbon electrode was fabricated. The electrode was modified by attaching gold nanoparticles onto the surface of screen-printed carbon electrode through seed mediated growth method followed by self-assembly of L-cysteine. As demonstrated by differential pulse voltammetry, the sensor exhibited high sensitivity to copper (II) ion down to ppb (parts per billion) levels. Optimization of various experimental parameters such as pH, buffer concentration, and preconcentration time, which influenced the performance of the biosensor, was investigated. The sensor demonstrated a wide linear response range from 10 to 0.005 ppm(r=0.9870), with a lower detection limit of 8 ppb using 10 min of preconcentration time. The sensor based on screen-printed electrode provides a cost-effective means of application of copper ion sensor for the detection of ppb level of copper ions in water.

scholarly journals New Cu4Na4- and Cu5-Based Phenylsilsesquioxanes. Synthesis via Complexation with 1,10-Phenanthroline, Structures and High Catalytic Activity in Alkane Oxidations with Peroxides in Acetonitrile

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 701 ◽  
Author(s):  
Grigorii Astakhov ◽  
Mikhail Levitsky ◽  
Alexander Korlyukov ◽  
Lidia Shul’pina ◽  
Elena Shubina ◽  
...  
Keyword(s):  
Self Assembly ◽  
Copper Ions ◽  
Supramolecular Organization ◽  
High Catalytic Activity ◽  
Stacking Interactions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mild Conditions ◽  
Phenanthroline Ligands

Self-assembly of copper(II)phenylsilsesquioxane assisted by the use of 1,10-phenanthroline (phen) results in isolation of two unusual cage-like compounds: (PhSiO1,5)12(CuO)4(NaO0.5)4(phen)4 1 and (PhSiO1,5)6(PhSiO1,5)7(HO0.5)2(CuO)5(O0.25)2(phen)3 2. X-Ray diffraction study revealed extraordinaire molecular architectures of both products. Namely, complex 1 includes single cyclic (PhSiO1,5)12 silsesquioxane ligand. Four sodium ions of 1 are additionally ligated by 1,10-phenanthrolines. In turn, “sodium-less” complex 2 represents coordination of 1,10-phenanthrolines to copper ions. Two silsesquioxane ligands of 2 are: (i) noncondensed cubane of a rare Si6-type and (ii) unprecedented Si7-based ligand including two HOSiO1.5 fragments. These silanol units were formed due to removal of phenyl groups from silicon atoms, observed in mild conditions. The presence of phenanthroline ligands in products 1 and 2 favored the π–π stacking interactions between neighboring cages. Noticeable that in the case of 1 all four phenanthrolines participated in such supramolecular organization, unlike to complex 2 where one of the three phenanthrolines is not “supramolecularly active”. Complexes 1 and 2 were found to be very efficient precatalysts in oxidations with hydroperoxides. A new method for the determination of the participation of hydroxyl radicals has been developed.

scholarly journals Adsorption Performance of Modified Fly Ash for Copper Ion Removal from Aqueous Solution

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 207
Author(s):  
Gabriela Buema ◽  
Maria Harja ◽  
Nicoleta Lupu ◽  
Horia Chiriac ◽  
Loredana Forminte ◽  
...  
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Copper Ions ◽  
Alkali Treatment ◽  
Copper Ion ◽  
Ion Concentration ◽  
Bet Surface Area ◽  
X Ray ◽  
Ion Removal ◽  
New Material

The initial characteristics of Romanian fly ash from the CET II Holboca power plant show the feasibility of its application for the production of a new material with applicability in environmental decontamination. The material obtained was characterized using standard techniques: scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), instrumental neutron activation analysis (INAA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), the Brunauer–Emmett–Teller (BET) surface area, and thermogravimetric differential thermal analysis (TG-DTA). The adsorption capacity of the obtained material was evaluated in batch systems with different values of the initial Cu(II) ion concentration, pH, adsorbent dose, and contact time in order to optimize the adsorption process. According to the experimental data presented in this study, the adsorbent synthesized has a high adsorption capacity for copper ions (qmax = 27.32–58.48 mg/g). The alkali treatment of fly ash with NaOH improved the adsorption capacity of the obtained material compared to that of the untreated fly ash. Based on the kinetics results, the adsorption of copper ions onto synthesized material indicated the chemisorption mechanism. Notably, fly ash can be considered an important beginning in obtaining new materials with applicability to wastewater treatment.

scholarly journals Chiral Cyclic [n]Spirobifluorenylenes: Carbon Nanorings Consisting of Helically Arranged Quaterphenyl Rods Illustrating Partial Units of Woven Patterns

2020 ◽  
Author(s):  
Kaige Zhu, ◽  
Kosuke Kamochi ◽  
Takuya Kodama ◽  
Mamoru Tobisu ◽  
Toru Amaya
Keyword(s):  
Building Blocks ◽  
Spectroscopic Properties ◽  
Crystallographic Analysis ◽  
Quantum Yields ◽  
X Ray ◽  
New Family ◽  
Circularly Polarized Luminescence ◽  
Polarized Luminescence ◽  
Yamamoto Coupling ◽  
Carbon Nanorings

Chiral cyclic [n]spirobifluorenylenes consisting of helically arranged quaterphenyl rods, illustrating partial units of woven patterns, were designed and synthesized as a new family of carbon nanorings. The synthesis was accomplished by the Ni(0)-mediated Yamamoto-coupling of chiral spirobifluorene building blocks. The structures of the cyclic 3- and 4-mers were determined by X-ray crystallographic analysis. These carbon nanorings exhibited a strong violet colored emission with high quantum yields in solution (95%, 93%, and 94% for 3-, 4-, and 5-mer, respectively). Other spectroscopic properties, including their chiroptical properties, were also investigated. The gvalues for circularly polarized luminescence were found to be in the order of 10-3, where that of the 4-mer showed a relatively higher value 8.5 x 10-3. Characteristic spiroconjugation induced by multiple (≧ 3) bifluorenyl units, for example the even-odd effect of the number of units in the matching of the sign of the orbitals, were also revealed by DFT calculations.<br>

scholarly journals Crystallization and preliminary X-ray crystallographic analysis of a bacterial tyrosinase fromBacillus megaterium

2010 ◽  
Vol 66 (9) ◽  
pp. 1101-1103 ◽  
Author(s):  
Mor Sendovski ◽  
Margarita Kanteev ◽  
Vered Shuster Ben-Yosef ◽  
Noam Adir ◽  
Ayelet Fishman
Keyword(s):  
Copper Ions ◽  
Crystallographic Analysis ◽  
Zinc Ions ◽  
Primary Analysis ◽  
Space Group ◽  
X Ray ◽  
Space Groups ◽  
Crystal Density ◽  
Type 3 ◽  
Packing Interactions

Tyrosinases are type 3 copper enzymes that are involved in the production of melanin and have two copper ions in the active site. Here, the crystallization and primary analysis of a tyrosinase fromBacillus megateriumis reported. The purified protein was crystallized in the absence or presence of zinc ions and the crystals diffracted to a resolution of 2.0 Å. Crystals obtained in the presence of zinc belonged to space groupP212121, while crystals grown in the absence of zinc belonged to space groupP21. In both space groups the asymmetric unit contained a dimer, with minor differences in the crystal density and in packing interactions.

Structure and photophysical and electrochemical properties of a copper porphyrin complex with a three-dimensional framework

2020 ◽  
Vol 76 (2) ◽  
pp. 133-138
Author(s):  
Wen-Tong Chen
Keyword(s):  
Self Assembly ◽  
Copper Ions ◽  
Copper Chloride ◽  
Three Dimensional ◽  
X Ray ◽  
X Ray Crystallography ◽  
Copper Porphyrin ◽  
Square Planar ◽  
Planar Geometries ◽  
Solvothermal Conditions

Porphyrins and metalloporphyrins can generally show attractive structural motifs and interesting properties. A new copper porphyrin, namely poly[[μ-chlorido-[μ5-5,10,15,20-tetrakis(pyridin-4-yl)-21H,23H-porphine]tricopper(I)] [aquadichloridocopper(II)]], {[Cu3(C40H24N8)Cl][CuCl2(H2O)]} n (1), was synthesized by the self-assembly of copper chloride with 5,10,15,20-tetrakis(pyridin-4-yl)-21H,23H-porphine under solvothermal conditions. The structure of this copper porphyrin was characterized by single-crystal X-ray crystallography and elemental analysis. The porphyrin macrocycle shows a distorted saddle geometry, with the four pyrrole rings slightly distorted in an alternating mode either upwards or downwards. The copper ions show three-coordinated triangular and four-coordinated square-planar geometries. Every copper–porphyrin unit connects to 12 others via four μ4-bridging Cu2Cl moieties to complete the three-dimensional framework of compound 1, with isolated CuCl2(H2O) units located in the voids. This copper porphyrin displays a red photoluminescence. Electrochemical measurements showed that compound 1 has two redox waves (E 1/2 = −160 and 91 mV).

Modular Peptide-Based Hybrid Nanoprobes for Bio-Imaging and Bio-Sensing

2014 ◽  
Vol 1621 ◽  
pp. 155-161 ◽  
Author(s):  
Banu Taktak Karaca ◽  
James Meyer ◽  
Sarah VanOosten ◽  
Mark Richter ◽  
Candan Tamerler
Keyword(s):  
Self Assembly ◽  
Copper Ions ◽  
Copper Ion ◽  
Gold Surface ◽  
Protein Arrays ◽  
Recognition Element ◽  
Ion Sensing ◽  
Wide Range ◽  
Biological Recognition ◽  
Assembly Technique

ABSTRACTThe self-organization of functional proteins directly onto solid materials is attractive to a wide range of biomaterials and systems that need to accommodate a biological recognition element. In such systems, inorganic binding peptides may be an essential component due to their high affinity and selective binding features onto different types of solid surfaces. This study demonstrates a peptide-enabled self-assembly technique for designing well-defined protein arrays over a metal surface. To illustrate this concept, we designed a fusion protein that simultaneously displays a red fluorescence protein (DsRed-monomer), which is highly selective for copper ions, and a gold binding peptide AuBP. The peptide tag, AuBP, self-directs the organization of DsRed-monomer protein onto a gold surface and forms arrays built upon an efficient control of the organic/inorganic interface at the molecular level. The peptide-assisted design offers a modular approach for fabrication of fluorescent-based protein arrays with copper ion sensing ability.

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