scholarly journals Molecular cannibalism: Sacrificial materials as precursors for hollow and multidomain single crystals

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Maria Chiara di Gregorio ◽  
Merna Elsousou ◽  
Qiang Wen ◽  
Linda J. W. Shimon ◽  
Vlad Brumfeld ◽  
...  
Keyword(s):  
Single Crystals ◽  
Crystal Engineering ◽  
Metal Salt ◽  
Radical Species ◽  
New Class ◽  
Synthetic Materials ◽  
Active Metal ◽  
Crystallographic Structures ◽  
Chiral Crystals ◽  
Sacrificial Materials

AbstractThe coexistence of single-crystallinity with a multidomain morphology is a paradoxical phenomenon occurring in biomineralization. Translating such feature to synthetic materials is a highly challenging process in crystal engineering. We demonstrate the formation of metallo-organic single-crystals with a unique appearance: six-connected half-rods forming a hexagonal-like tube. These uniform objects are formed from unstable, monodomain crystals. The monodomain crystals dissolve from the inner regions, while material is anisotropically added to their shell, resulting in hollow, single-crystals. Regardless of the different morphologies and growth mechanism, the crystallographic structures of the mono- and multidomain crystals are nearly identical. The chiral crystals are formed from achiral components, and belong to a rare space group (P622). Sonication of the solvents generating radical species is essential for forming the multidomain single-crystals. This process reduces the concentration of the active metal salt. Our approach offers opportunities to generate a new class of crystals.

Growth direction dependent separate-channel charge transport in organic weak charge-transfer co-crystal of anthracene-DTTCNQ

2022 ◽  
Author(s):  
Hui Jiang ◽  
Jun Ye ◽  
Peng Hu ◽  
Shengli Zhu ◽  
Yanqin Liang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Transport ◽  
Electronic Properties ◽  
Single Crystals ◽  
Organic Semiconductors ◽  
Crystal Engineering ◽  
Molecular Crystal ◽  
Growth Direction ◽  
Weak Charge ◽  
Separate Channel

Co-crystallization is an efficient way of molecular crystal engineering to tune the electronic properties of organic semiconductors. In this work, we synthesized anthracene-4,8-bis(dicyanomethylene)4,8-dihydrobenzo[1,2-b:4,5-b’]-dithiophene (DTTCNQ) single crystals as a template to...

Dioxygen-derived radicals in biological systems

1985 ◽  
Vol 311 (1152) ◽  
pp. 605-615 ◽  
Keyword(s):  
Respiratory Burst ◽  
Electrochemical Method ◽  
Culture Medium ◽  
Biological Systems ◽  
Cellular Systems ◽  
Superoxide Ion ◽  
Radical Species ◽  
Redox Active ◽  
Active Metal ◽  
Redox Active Metal

Three instances of the involvement of dioxygen-derived radicals in biological systems are considered. The first concerns the formation of radicals in the haemolytic reactions induced by treatment of erythrocytes by phenylhydrazine, as an example of the so-called ‘oxidant drugs’. The evidence for the formation of phenyl radicals is considered and their origin in the oxidation of phenylhydrazine by a ferryl derivative of haemoglobin postulated. The relevance to the formation of phenylated iron and porphyrin species is described. It is suspected that many instances of oxidative damage to cellular systems result from the coincidence of unsequestered redox-active metal ions (particularly those of iron and copper), reductants, and dioxygen. As an example, the damage to hepatocytes, grown in a culture medium containing cysteine, is described. The formation of radical species derived from dioxygen during the respiratory burst associated with phagocytosis is discussed. A new electrochemical method of detecting the superoxide ion produced during the respiratory burst is described. Particular emphasis is placed on the relation between the production of radical species such as the hydroxyl radical and the superoxide ion, and the extent of phagocytosis.

scholarly journals Interference-contrast optical activity: a new technique for probing the chirality of anisotropic samples and more

2020 ◽  
Vol 7 (5) ◽  
pp. 192201 ◽  
Author(s):  
R. P. Cameron ◽  
U. Vogl ◽  
N. Trautmann
Keyword(s):  
Pharmaceutical Industry ◽  
Optical Activity ◽  
Optical Rotation ◽  
New Technique ◽  
Future Research ◽  
Linear Birefringence ◽  
New Class ◽  
Potential Applications ◽  
A New Technique ◽  
Chiral Crystals

We introduce interference-contrast optical activity (ICOA) as a new technique for probing the chirality of anisotropic samples and more. ICOA could underpin a new class of ‘chiral microscopes’, with potential applications spanning the range of chirality and beyond. Two possible versions of ICOA are described explicitly; one designed to probe the optical rotation of a transparent sample regardless of the sample’s linear birefringence (ICOA-OR) and another designed to probe gradients in the optical rotation of a transparent sample (ICOA-GOR). Simulated results for α -quartz lead us to suggest that ICOA-GOR might be applied to help monitor the growth of chiral crystals in the pharmaceutical industry. Possible directions for future research are highlighted.

scholarly journals Benzothiazolium Single Crystals: A New Class of Nonlinear Optical Crystals with Efficient THz Wave Generation

2017 ◽  
Vol 29 (30) ◽  
pp. 1701748 ◽  
Author(s):  
Seung-Heon Lee ◽  
Jian Lu ◽  
Seung-Jun Lee ◽  
Jae-Hyun Han ◽  
Chan-Uk Jeong ◽  
...  
Keyword(s):  
Single Crystals ◽  
Nonlinear Optical ◽  
Wave Generation ◽  
Nonlinear Optical Crystals ◽  
Thz Wave ◽  
New Class ◽  
Optical Crystals

scholarly journals Neue Koordinationspolymere mit Acetylendicarboxylat als verbrückenden und Pyridin als terminierenden Liganden / New Coordination Polymers with Acetylenedicarboxylate as Bridging and Pyridine as Terminating Ligands

2009 ◽  
Vol 64 (10) ◽  
pp. 1093-1097 ◽  
Author(s):  
Irena Stein ◽  
Uwe Ruschewitz
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Single Crystals ◽  
Coordination Polymers ◽  
Metal Salt ◽  
Water Molecules ◽  
Stacking Interactions ◽  
Aromatic Stacking ◽  
Pyridine Ligands ◽  
Acetylenedicarboxylic Acid

By slow diffusion of pyridine (py) into an aqueous solution containing the respective metal salt and acetylenedicarboxylic acid (H2ADC), single crystals of coordination polymers of composition 1∞[MII(H2O)2(py)2ADC] with MII = Zn (1) and Cd (2) were obtained. The crystal structures consist of octahedral MIIN2O4 units, which are connected to chains via acetylenedicarboxylate dianions. Hydrogen bonds between O atoms of the dianions and of the water molecules lead to the formation of layers perpendicular to [010]. The structure is further held together by weak aromatic stacking interactions between the pyridine ligands.

scholarly journals Single Crystal Hybrid Perovskite Optoelectronics: Progress and Perspectives

2020 ◽  
Author(s):  
Feng LI
Keyword(s):  
Single Crystals ◽  
Carrier Transport ◽  
Research Attention ◽  
Light Emitting ◽  
Practical Applications ◽  
New Class ◽  
Hybrid Perovskite ◽  
Device Applications ◽  
Perovskite Crystal ◽  
Higher Carrier Mobility

Organic–inorganic hybrid perovskites, which combine the superior optical and electronic properties and solution-processed manufacturing, have emerged as a new class of revolutionary optoelectronic devices with the potential for various practical applications. Encouraged by the advantages of longer carrier diffusion length, higher carrier mobility and lower trap densities as compared to the polycrystalline counterparts’, increasing research attention has focused on preparation and optimization of perovskite crystal candidates, via using various facile growth techniques, for the development of a wide range of optoelectronic applications. This chapter presents a comprehensive review of recent advances in the field of optoelectronic technologies based on different forms of single crystals, including bulk crystals and thin ones, with emphasis placed on the optimization of crystals and the relationship among the charge-carrier transport, operation mechanism, device architecture, and device performance. First, we introduce the main methods used to prepare bulk and thin single crystals, and analyze several aspects of their properties. Thereafter, the applications of single crystals into solar cells, photodetectors, light-emitting diodes, and lasers, are discussed in depth. Finally, we summarize the challenges of perovskite single crystals and propose further improvements in the synthesis approaches and device applications.

Development of Hybrid Cellulose Bio Nanocomposite From Banana and Jute Fiber

2017 ◽  
pp. 361-379 ◽  
Author(s):  
Ayush Rathore ◽  
Mohan Kumar Pradhan
Keyword(s):  
Natural Fiber ◽  
Value Added ◽  
Jute Fiber ◽  
The Sustainable Development ◽  
New Class ◽  
Synthetic Materials ◽  
Ecological Changes ◽  
Major Disadvantage ◽  
New Material ◽  
Materials Used

In the era of globalization and industrialization the concern is limited only in development, without taking the environment into consideration this leads to global warming and big ecological changes in recent year. The material like Synthetic materials used in many applications due to ease of fabrication and higher strength, but the major disadvantage with it is, its neither recyclable nor bio-degradable. Therefore, the researchers develop a new material and technique for the sustainable development. A lot of researches were carried out in the reinforcing potential in the polymer matrix composite, reinforcing can be of two kinds synthetic and natural fiber. Natural fiber is gaining importance in the last decade due to its ecofriendly nature and does not leave carbon foot print, for better utilization of banana and jute fiber for making value added products. Hence, in this work the objective is to develop a new class of hybrid nano-materials from natural fiber such as banana and jute fiber. This chapter sees an opportunity of enhancement of interface property.

PHOSPHATE TUNGSTEN BRONZES — A NEW FAMILY OF QUASI-LOW-DIMENSIONAL METALLIC OXIDES

1993 ◽  
Vol 07 (23n24) ◽  
pp. 3937-3971 ◽  
Author(s):  
MARTHA GREENBLATT
Keyword(s):  
Single Crystals ◽  
Density Wave ◽  
Measurement Data ◽  
X Ray Diffraction ◽  
New Class ◽  
Metallic Oxides ◽  
New Family ◽  
Oxide Bronzes ◽  
Low Dimensional ◽  
Low Dimensional Materials

A brief introduction is presented on transition metal oxide bronzes and their relationship to the phosphate tungsten bronzes; the latter compounds are the major focus of this review. The phosphate tungsten bronzes (PTB) are a new class of quasi-low-dimensional materials which exhibit charge density wave (CDW) instabilities. The growth of single crystals and investigation of the physical properties including the temperature dependence of the electrical resistivity and magnetic susceptibility on oriented single crystals are discussed for selected members of the major families in the PTB’s. Correlation of the physical measurement data with structural properties, X-ray diffraction data and results of the theoretical band structure calculations are also presented.

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