A heterometallic strategy to achieve a large magnetocaloric effect in polymeric 3d complexes

2015 ◽  
Vol 51 (39) ◽  
pp. 8288-8291 ◽  
Author(s):  
Jiong-Peng Zhao ◽  
Song-De Han ◽  
Xue Jiang ◽  
Sui-Jun Liu ◽  
Ran Zhao ◽  
...  

A large magnetocaloric effect was realized in polymeric 3d complexes for the first time by complementarity of magnetic orbital interactions in a heterometallic system.

2015 ◽  
Vol 13 (8) ◽  
pp. 2260-2263 ◽  
Author(s):  
Di Xu ◽  
Li Dai ◽  
Marta Catellani ◽  
Elena Motti ◽  
Nicola Della Ca’ ◽  
...  

Chiral dibenzopyran derivatives were obtained by cinchona alkaloid, as organocatalyst, in combination, for the first time, with palladium/norbornene catalytic system.


Author(s):  
Anastasia Marinopoulou

In his systems’ theory, Luhmann attempts to redefine communication, and associates it with information. For Luhmann, communication is distinct from action (Handeln), and the rationality of the scientific system resides in the notion of Zweck, or in the ends of the sciences towards action. For the first time in the epistemological history of modernity, rationality is understood as a certain scientific purpose of action and not as the critique of scientific truth and validity of reason. The schism that Luhmann brought about between ‘traditional’ epistemology (reconsidered now as novel) and the ‘critical’ theory of science (seen by Luhmann as ‘traditional’) was irredeemable. In the following pages, I maintain that all evidence to the contrary such a divergence was inherent to modernity.Drawing on the Schützean model of multiple realities, Luhmann manages to blur the distinction between instrumentality and rationality by relativizing both within systemic complexity. According to Luhmann, complexity characterizes a multifaceted social system, such as science itself. However, I argue that where complexity, in Luhmann, interprets the systemic, it also employs presentism and partial situationalism to explain the essence and methodology of science as a system.


Author(s):  
Eric Scerri

Our story begins, somewhat arbitrarily, in the English city of Manchester around the turn of the nineteenth century. There, a child prodigy by the name of John Dalton, at the tender age of fifteen is teaching in a school with his older brother. Within a few years, John Dalton’s interests have developed to encompass meteorology, physics, and chemistry. Among the questions that puzzle him is why the various component gases in the air such as oxygen, nitrogen, and carbon dioxide do not separate from each other. Why does the mixture of gases in the air remain as a homogeneous mixture? As a result of pursuing this question, Dalton develops what is to become modern atomic theory. The ultimate constituents of all substances, he supposes, are hard microscopic spheres or atoms that were first discussed by the ancient Greek philosophers and taken up again by modern scientists like Newton, Gassendi, and Boscovich. But Dalton goes a good deal further than all of these thinkers in establishing one all-important quantitative characteristic for each kind of atom, namely its weight. This he does by considering quantitative data on chemical experiments. For example, he finds that the ratio for the weight in which hydrogen and oxygen combine together is one to eight. Dalton assumes that water consists of one atom of each of these two elements. He takes a hydrogen atom to have a weight of 1 unit and therefore reasons that oxygen must have a weight of 8 units. Similarly, he deduces the weights for a number of other atoms and even molecules as we now call them. For the first time the elements acquire a quantitative property, by means of which they may be compared. This feature will eventually lead to an accurate classification of all the elements in the form of the periodic system, but this is yet to come. Before that can happen the notion of atoms provokes tremendous debates and disagreements among the experts of Dalton’s day.


The Analyst ◽  
2015 ◽  
Vol 140 (1) ◽  
pp. 79-82 ◽  
Author(s):  
Guifen Jie ◽  
Yingqiang Qin ◽  
Qingmin Meng ◽  
Jialin Wang

Electrochemiluminescence energy transfer from CdSe QDs to folic acid was applied for the first time for amplified detection of DNA by a DNAzyme autocatalytic system.


CrystEngComm ◽  
2014 ◽  
Vol 16 (32) ◽  
pp. 7575-7579 ◽  
Author(s):  
Yong Chan Cho ◽  
Bum-Su Kim ◽  
Hanbyeol Yoo ◽  
Ji Young Kim ◽  
Seunghun Lee ◽  
...  

By using grain-free single crystal specimens, the melting of Cu and Ag using electrostatic levitation (ESL) and obtaining their high-temperature densities were accomplished for the first time.


The ionization of methane and the methyl halide molecules by essentially mono-energetic electrons, produced by pulse techniques, has been studied in detail in a mass spectrometer. It has been possible to detect for the first time the production of the molecular ions of these compounds in most of their excited electronic states. In the cases of the ions of methyl bromide and iodide we have been able to resolve the components of the doublets of the ground 2 E states which arise from spin-orbital interactions in these molecular ions. The several ionization potentials of each of the molecules which refer to the formation of the ions in their different electronic excited states have been measured. These new results are of interest in that they enable the molecular-orbital theories of the electronic structures of methane and the methyl halides to be assessed. They also provide support for recent theories of the origin of the ions in the mass spectra of organic compounds. It has been demonstrated that there is a monotonic relationship between the ionization potential of electrons in the [ σα 1 ] bonding orbital localized in the C— X bond of these molecules and the corresponding bond dissociation energy.


2018 ◽  
Vol 20 (1) ◽  
pp. 113-117 ◽  
Author(s):  
Xunbo Lu ◽  
Yufeng Shi ◽  
Fangrui Zhong
Keyword(s):  
System P ◽  

An efficient Rh-catalyzed intermolecular C(sp3)–H amination in a purely aqueous system is developed for the first time.


2014 ◽  
Vol 2 (15) ◽  
pp. 5363-5370 ◽  
Author(s):  
Wei Wang ◽  
Huan Qi ◽  
Haibo Long ◽  
Xiaoyang Wang ◽  
Hongqiang Ru

It is for the first time demonstrated that clew-like silica particles with complex hierarchically meso–mesoporous structures can be prepared via a simple TEOS/HCl(aq.)/P123 ternary non-ionic templating system.


2017 ◽  
Vol 4 (2) ◽  
pp. 425-436 ◽  
Author(s):  
Yi Li ◽  
Yanan Li ◽  
Baorong Xie ◽  
Jingjing Han ◽  
Sihui Zhan ◽  
...  

3D columnar CexZr1−xO2/RGO composite electrodes were prepared based on a hydrothermal self-assembly method and were used as cathodes to degrade ciprofloxacin (CIP) for the first time in an electro-Fenton system.


RSC Advances ◽  
2016 ◽  
Vol 6 (37) ◽  
pp. 30951-30955 ◽  
Author(s):  
Yong Liu ◽  
Fangfang Meng ◽  
Weiying Lin

In this work, we have engineered a novel fluorescent probe PI, which remarkably can reversible detect copper ion and cysteine in pure water system for the first time.


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