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1.
Mahsa Armaghan Ezzat Najafi Tim-Oliver Knedel Walter Frank Christoph Janiak 《无机化学与普通化学杂志》2020,646(22):1861-1868
Three d10-transition-metal coordination compounds [Cd(tfpb)2(4-bpmh)]n ( 1 ), [Cd(9-aca)(NO3)(OHCH3)(4-bpmh)]n ( 2 ) and [Zn2(dpp)4(4-bpmh)] ( 3 ) with the bridging ligand 4-bpmh were synthesized [4-bpmh = 1,2-bis(pyridin-4-ylmethylene)hydrazine, tfpb = 4,4,4-trifluoro-1-phenylbutane-1,3-dionate, 9-aca = anthracene-9-carboxylate, dpp = 1,3-diphenylpropane-1,3-dionate]. Compounds 1 – 3 were characterized by FT-IR spectroscopy, elemental analysis, and structurally authenticated by X-ray crystallography. Compounds 1 – 3 are constructed by an O,O'-donor ligand including chelating β-diketonates (tfpb, dpp) in 1 and 3 and a carboxylate ligand (9-aca) in 2 in combination with a linear neutral bidentate and bridging N-ligand (4-bpmh). The assembly and action of the bridging 4-bpmh ligand leads to one-dimensional coordination polymers in 1 , 2 and to a dinuclear coordination complex in 3 . The structures and the solid-state supramolecular interactions for studying the crystal packing fashions of 1 – 3 were analyzed. The supramolecular interactions including hydrogen bonding, C–H ··· π, π ··· π, and C–F ··· π in 1 , 2 , and 3 were founded. 相似文献
2.
M. A. Shafaei E. Saion K. Wood K. Naghavi Kh. Rezaee 《Journal of Radioanalytical and Nuclear Chemistry》2011,288(2):599-602
Some vegetables of important nutritive requirements have been collected from Kuala Lumpur region capital of Malaysia. The
vegetables were analyzed in order to determine activity concentration level of potassium using neutron activation analysis
(NAA). The NAA results obtained showed the activity concentration of 40K varied from 379 Bq/kg (Egg-plant) to 1585 Bq/kg (Spinach Red). These results are compared to other researches and are clear
that the concentrations of K are relatively high in the Malaysia in compared to rather than vegetables of Pakistan and Jamaican.
However, they are seen not to pose any serious internal health burden due to ingestion given the realities of vegetables choice
by individuals in the study area. 相似文献
3.
Mohammad Bakherad Ali Keivanloo Elmira Moradian Amir H. Amin Rahele Doosti Mahsa Armaghan 《Journal of the Iranian Chemical Society》2018,15(12):2811-2819
The new catalyst silica-caffeine hydrogen sulfate [SiO2-caff.]HSO4 was conveniently prepared from commercially available 3-chloropropyltriethoxysilane via immobilization on silica followed by reaction with caffeine. The catalyst prepared was then characterized by the FT-IR spectroscopy, TGA, EDX, and SEM techniques. It was found that this heterogeneous catalyst was a highly efficient one for the synthesis of tetrahydrobenzo[b]pyrans in good-to-high yields, and could be recovered by a simple filtration of the reaction solution and reused for five consecutive runs. The attractive features of this method are simple procedure, clean reaction, easy work-up, use of a reusable catalyst, and performing a multi-component reaction. 相似文献
4.
A 3-D thermal analysis of 870 nm high-index-contrast grating (HCG)-based vertical cavity surface emitting laser (VCSEL) by using finite volume method (FVM) is presented in this paper. The HCG-based VCSEL is modeled by applying a steady-state 3-D heat dissipation model. Temperature distribution profile and thermal resistance (Rth) of the device are investigated by inserting the heat source value into the thermal simulation. Also, this analysis is performed for a conventional VCSEL operating at the same wavelength and under the same injected current as well as the same geometric sizes. The analysis shows that the maximum temperature inside the HCG-based VCSEL is lower than that inside the conventional VCSEL. 相似文献
5.
6.
Using a nano-injection method, we introduced phospholipids having different intrinsic geometries into single secretory cells and used single cell amperometry (SCA) and intracellular vesicle impact electrochemical cytometry (IVIEC) with nanotip electrodes to monitor the effects of intracellular incubation on the exocytosis process and vesicular storage. Combining tools, this work provides new information to understand the impact of intracellular membrane lipid engineering on exocytotic release, vesicular content and fraction of chemical release. We also assessed the effect of membrane lipid alteration on catecholamine storage of isolated vesicles by implementing another amperometric technique, vesicle impact electrochemical cytometry (VIEC), outside the cell. Exocytosis analysis reveals that the intracellular nano-injection of phosphatidylcholine and lysophosphatidylcholine decreases the number of released catecholamines, whereas phosphatidylethanolamine shows the opposite effect. These observations support the emerging hypothesis that lipid curvature results in membrane remodeling through secretory pathways, and also provide new evidence for a critical role of the lipid localization in modulating the release process. Interestingly, the IVIEC data imply that total vesicular content is also affected by in situ supplementation of the cells with some lipids, while, the corresponding VIEC results show that the neurotransmitter content in isolated vesicles is not affected by altering the vesicle membrane lipids. This suggests that the intervention of phospholipids inside the cell has its effect on the cellular machinery for vesicle release rather than vesicle structure, and leads to the somewhat surprising conclusion that modulating release has a direct effect on vesicle structure, which is likely due to the vesicles opening and closing again during exocytosis. These findings could lead to a novel regulatory mechanism for the exocytotic or synaptic strength based on lipid heterogeneity across the cell membrane.Amperometry and intracellular vesicle impact electrochemical cytometry with nanotip electrodes were used to monitor the effects on exocytosis and vesicular storage after nano-injection of phospholipids with different geometries into secretory cells. 相似文献
7.
Weifeng Shi Le Zhang Maryam Shafaei‐Fallah Alexander Rothenberger Dr. 《无机化学与普通化学杂志》2007,633(3):440-442
The synthesis and structures of three new compounds are reported. [Mg2{PhP(Se,O)Se‐Se(O,Se)PPh}2(thf)7(H2O)3] ( 1 ), [Mg{PhP(Se,O)Se‐Se(O,Se)PPh}(thf)3(H2O)] ( 2 ), and [Mn{PhP(Se,O)Se‐Se(O,Se)PPh}(thf)3(H2O)] ( 3 ) were prepared by treatment of Woollins' reagent [PhP(Se)(μ‐Se)]2 with the corresponding hydrated metal acetates. 相似文献
8.
Maryam Shafaei‐Fallah Weifeng Shi Dieter Fenske Alexander Rothenberger 《无机化学与普通化学杂志》2006,632(6):1091-1096
Syntheses and Structures of Transition Metal Complexes with Dithiophosphinato and Trithiophosphinato Ligands The reactions of MnCl2 with Ph2P(S)(SSiMe3) produced [Mn(S2PPh2)2(thf)2] ( 1 ) and [Mn(S2PPh2)2(dme)] ( 2 ) (DME = 1,2‐Dimethoxyethane). The compounds [Co6(S3PPh)2(μ4‐S)2(μ3‐S)2(PPh3)4] ( 3 ), [Co2(S3PPh)2(PPh3)2] ( 4 ), [Ni(S2PPh)(PPhEt2)2] ( 5 ), [Ni(S3PPh)(PPhEt2)2] ( 6 ) and [Cu4(S3PPh)2(dppp)2] ( 8 ) [dppp = 1,3‐Bis(diphenylphosphanyl)propane] were obtained from reactions of first‐row transition metal halides with PhP(S)(SSiMe3)2 in the presence of tertiary phosphines. In a reaction of PhP(S)(SSiMe3)2 with PhPEt2 PhPEt2PS2Ph ( 7 ) was isolated. All compounds were characterized by X‐ray crystallography. 相似文献
9.
Shear-induced transitions between a planar lamellar phase and multilamellar vesicles: continuous versus discontinuous transformation 总被引:1,自引:0,他引:1
Medronho B Shafaei S Szopko R Miguel MG Olsson U Schmidt C 《Langmuir : the ACS journal of surfaces and colloids》2008,24(13):6480-6486
The shear-induced transitions between an oriented lamellar phase and shear-induced multilamellar vesicles (MLVs) in a nonionic surfactant system were studied by deuterium rheo-NMR spectroscopy as a function of time in start-up experiments at several temperatures and shear rates. By starting from an initial state of oriented lamellae and observing the transformation to the final steady state of MLVs and vice-versa, two different mechanisms were found, depending on the direction of the transition and the initial state. The transition is continuous when MLVs are formed, starting from the oriented lamellar phase. On the other hand, a discontinuous nucleation-and-growth process with a coexistence region is observed when transforming MLVs into an oriented lamellar phase. 相似文献
10.
Kh. Rezaee M. R. Abdi E. B. Saion K. Naghavi M. A. Shafaei 《Journal of Radioanalytical and Nuclear Chemistry》2011,287(3):733-740
In order to complete having data base of elemental assessment of the east coast of Peninsular Malaysia marine sediments along
the South China Sea coasts, trace elements are analyzed and their distribution in marine sediments is undertaken. The present
study is done parallel with pervious study on elemental assessment of heavy metals, rare earth elements and actinides in the
marine sediments of the east coast of Peninsular Malaysia. Thirty surface sediment samples were collected in this area, including
regions of Kelantan, Terengganu, Pahang, Rompin and Johor Baharu. Multielemental analysis was carried out by instrumental
neutron activation analysis and inductively coupled plasma atomic emission spectroscopy. In both cases methodology validation
was performed by certified reference material analyses. For the surface elemental distributions the enrichment factor values,
average I
geo and mC
d values indicate that the trace elements of the surface sediments are uncontaminated in all sampling stations that are consistent
with previous studies results of heavy metals, rare earth elements and actinides. 相似文献