Two organic–inorganic hybrid polyoxotungstogermanates containing organic ligand chelated Fe–Dy heterometallic clusters and frequency dependent magnetic properties

2020 ◽  
Vol 7 (2) ◽  
pp. 498-504 ◽  
Author(s):  
Shi-Yu Wu ◽  
Yong-Jiang Wang ◽  
Ji-Xin Jing ◽  
Xin-Xiong Li ◽  
Yan-Qiong Sun ◽  
...  

Two organic–inorganic hybrid polyoxotungstogermanates are constructed from organic ligand chelated Fe–Dy heterometallic clusters and [B-α-GeW9O34]10− units with frequency dependent magnetic properties.






2015 ◽  
Vol 44 (19) ◽  
pp. 8971-8983 ◽  
Author(s):  
De-Chuan Zhao ◽  
Yang-Yang Hu ◽  
Hong Ding ◽  
Hai-Yang Guo ◽  
Xiao-Bing Cui ◽  
...  

Five compounds exhibiting novel structures constructed from polyoxoanions and metal mixed-organic-ligand complexes have been synthesized and characterized.



2013 ◽  
Vol 203 ◽  
pp. 92-99 ◽  
Author(s):  
Michelina Catauro ◽  
Flavia Bollino ◽  
Maria Cristina Mozzati ◽  
Chiara Ferrara ◽  
Piercarlo Mustarelli


2015 ◽  
Vol 7 (4) ◽  
pp. 45 ◽  
Author(s):  
Rubeni Tawanda Ranganai ◽  
Moikwathai Moidaki ◽  
James G. King

<p class="zhengwen">Soil magnetic properties measurements are relatively fast and inexpensive but have been proved to be sufficient for preliminary investigations in diverse socio-developmental issues. This paper presents results of a reconnaissance study of soil colour and magnetic susceptibility (c) in eastern Botswana, where ~80% of the population resides. The work is a first step to creating a database of rock and soil magnetic properties and to document spatial variations in magnetic properties in the country. These measurements are important as constraints for interpretation of available aeromagnetic data and can also be exploited for environmental soil research (pollution) and land-use planning (agriculture). The soils sampled include derivatives of varying types and provenance such as Archean gneissic granitoids, metamorphosed rocks (granulites), volcano-sedimentary assemblages, Karoo basalts, and alluvial sediments. A soil colour chart was used since soil colours and magnetic properties are diagnostic of its parent rock sources and weathering profiles. Soil magnetic susceptibilities were measured at both low frequency (0.46 MHz, clf) and high frequency (4.6 MHz, chf), thus allowing calculation of frequency-dependent susceptibility (cfd, cfd%) for detecting ultra-fine ferromagnetic minerals.</p>It was found that soils with Hues ranging from 7.5YR to 10YR have appreciable amount of magnetic materials and soils with Hues of 2.5YR are generally nonmagnetic. The results of soil magnetic susceptibility profiles show spatial variation closely related to the variation in basement rocks, which provides excellent evidence that the magnetic susceptibility variation reflects basement rocks or bedrock composition (soil parent material). In relation to the Botswana physiographic units, soils from the hardveld (Precambrian) show the highest susceptibilities, followed by those from the sandveld, with the lowest values being from the alluvial. The frequency dependent magnetic susceptibilities indicate the presence of ultra-fine super-paramagnetic minerals such as magnetite/maghemite. It is suggested that a systematic and continuous programme of rock and soil magnetic measurements would benefit various socio-economic and development priority sectors of Botswana. This also applies to many developing countries in Africa where soil physics and measurement of soil susceptibility in particular, is generally still at an embryonic stage.



2010 ◽  
Vol 63 (5) ◽  
pp. 836 ◽  
Author(s):  
Muhammad Ramzan Saeed Ashraf Janjua ◽  
Zhong-Min Su ◽  
Wei Guan ◽  
Chun-Guang Liu ◽  
Li-Kai Yan ◽  
...  

The second-order non-linear optical (NLO) response of organoimido-substituted hexamolybdates has been tuned from 218.61 × 10–30 to 490.10 × 10–30 esu. The dipole polarizabilities and second-order nonlinear optical (NLO) properties of organoimido derivatives of hexamolybdates have been investigated by using the time-dependent density functional response theory (TDDFT). The electron withdrawing ability of F (fluorine) has played an important role in tuning the second-order NLO response in this class of organic-inorganic hybrid compounds; particularly system 6 [Mo6O18(NC16H8F2(CF3)2I)]2– with the static second-order polarizability (βvec ) computed to be 490.10 × 10–30 esu. Thus, our studied systems have the feasibility to be excellent tuneable second-order NLO materials. The analysis of the major contributions to the βvec value suggests that the charge transfer (CT) from POM to organic ligand (D-A) along the z-axis has been enhanced with addition of F atoms at the end phenyl ring which directs head (POM) to tail (fluorinated ring) charge transfer. The computed βvec values have been tuned by incorporation of different halogen atoms at the end phenyl ring of organoimido segment. Furthermore, substitution of two trifluoromethyl (–CF3) groups sideways along with iodine (I) at the terminus of end phenyl ring in the organoimido ligand has a striking influence on tuning the optical non-linearity, as CT from POM to the organoimido ligand was significantly increased. These systematic small changes in molecular composition by substitution of different halogen groups leads to a tuning the NLO response; the so-called ‘ripple effect’ catches this point nicely. Thus, the present investigation provides thought provoking insight into the tuneable NLO properties of organoimido-substituted hexamolybdates.



1979 ◽  
Vol 9 (6) ◽  
pp. 1111-1127 ◽  
Author(s):  
D Korn ◽  
D Schilling ◽  
G Zibold




2019 ◽  
Vol 48 (42) ◽  
pp. 15977-15988 ◽  
Author(s):  
Huifen Hu ◽  
Peijun Gong ◽  
Jingjing Pang ◽  
Jun Jiang ◽  
Lijuan Chen ◽  
...  

Two unprecedented 1-D double chain germanomolybdates containing hepta-nuclear Cu–RE–pic heterometallic clusters were prepared and the adsorption capacity of 1 toward dyes in aqueous solutions was investigated.



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