scholarly journals A tris-spiro metalla-aromatic system featuring Craig-Möbius aromaticity

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Zhe Huang ◽  
Yongliang Zhang ◽  
Wen-Xiong Zhang ◽  
Junnian Wei ◽  
Shengfa Ye ◽  
...  
Keyword(s):  
Organometallic Chemistry ◽  
Synthesis And Characterization ◽  
Experimental Measurements ◽  
Aromatic Rings ◽  
Aromatic System ◽  
Aromatic Systems ◽  
Theoretical Analyses ◽  
Biphenyl Ligands

AbstractAs aromaticity is one of the most fundamental concepts in chemistry, the construction of aromatic systems has long been an important subject. Herein, we report the synthesis and characterization of a tris-spiroaromatic complex, hexalithio spiro vanadacycle 2. The delocalization of the four electrons within the two V 3d orbitals and the π* orbitals of the three biphenyl ligands leads to a 40π Craig-Möbius aromatic system with three metalla-aromatic rings, as revealed by both experimental measurements and theoretical analyses. For comparison, if Cr is used instead of V, a similar Craig-Möbius aromatic system can not be generated. In this case, pentalithio spiro chromacycle 3 is obtained, and the Cr center uses its two 3d orbitals to form two independent metalla-aromatic rings. This work presents a type of aromatic systems that will contribute to both aromaticity theory and organometallic chemistry.

Synthesis and characterization of novel chiral derivatizing agents containing β-keto-anthracene adducts (KAAs) by 1H-NMR: aromatic influence and chiral alcohol absolute configuration determination

2019 ◽  
Vol 17 (3) ◽  
pp. 541-554
Author(s):  
Neeranuth Intakaew ◽  
Puracheth Rithchumpon ◽  
Chanatkran Prommin ◽  
Saranphong Yimklan ◽  
Nawee Kungwan ◽  
...  
Keyword(s):  
1H Nmr ◽  
Absolute Configuration ◽  
Synthesis And Characterization ◽  
Chiral Alcohols ◽  
Chiral Alcohol ◽  
Aromatic Rings ◽  
H Nmr ◽  
Chiral Derivatizing Agents

New chiral derivatizing agents and the effect of aromatic rings were investigated for absolute configuration of chiral alcohols via1H-NMR.

Organometallic chemistry in aqua regia: metal and ligand based oxidations of (NHC)AuCl complexes

2020 ◽  
Vol 49 (11) ◽  
pp. 3473-3479 ◽  
Author(s):  
Volodymyr Levchenko ◽  
Cristiano Glessi ◽  
Sigurd Øien-Ødegaard ◽  
Mats Tilset
Keyword(s):  
Organometallic Chemistry ◽  
Synthesis And Characterization ◽  
Carbene Complexes ◽  
Aqua Regia

The synthesis and characterization of a series of N-heterocyclic Au(iii) carbene complexes prepared by oxidation of (NHC)AuCl in aqua regia is described.

scholarly journals Synthesis and Characterization of Amphiphilic Arenephosphonates as Water-Soluble Micellular Radioluminescent Probes

2020 ◽  
Author(s):  
David French ◽  
Jay G. Simmons ◽  
Henry Everitt ◽  
Stephen H. Foulger ◽  
Gary M. Gray
Keyword(s):  
Micelle Formation ◽  
Secondary Emission ◽  
Water Soluble ◽  
Synthesis And Characterization ◽  
Excitation Wavelength ◽  
Aromatic Rings ◽  
Compound A ◽  
Emission Profile ◽  
Phosphonate Esters

<div>Abstract</div><div>This work describes the synthesis and characterization of a series of arenephosphonic acid salts for use as water soluble down-converters in optogenetic assays.</div><div>Two phosphonate salts based on anthracene and naphthalene were synthesized through</div><div>cleavage of phosphonate esters. A third amphiphilic salt, developed from a long-alkylchain modified naphthalene, was produced in the same manner to demonstrate micelle</div><div>formation. Two techniques were used to determine if any of the salts showed micelle</div><div>behavior: 31P NMR and fluorescence spectroscopy. Interestingly, all three compounds</div><div>exhibited micelle formation in water. UV-induced fluorescence of NapPONa and</div><div>AntPONa revealed a secondary emission profile with maximum excitation wavelengths</div><div>that lie on top of the primary emission profile. This secondary emission can be attributed</div><div>to the emission of the micellular structure based on solid-state fluorescence experiments.</div><div>Moderate x-ray induced radioluminescence was observed in the solid forms of each</div><div>compound. A solution of amphiphilic NapPONa demonstrated both concentrationdependent and micelle-dependent radioluminescence, indicating the positioning of</div><div>aromatic rings in a micelle is inducive to a radioluminescent response. Furthermore, the</div><div>emission wavelength of this compounds lies on top of the excitation wavelength of</div><div>channelrhodopsin-2, a well-studied optogenetic target.</div>

Synthesis and characterization of π-extended thienoacenes with up to 13 fused aromatic rings

2014 ◽  
Vol 55 (41) ◽  
pp. 5663-5666 ◽  
Author(s):  
Jing Shao ◽  
Xiaoli Zhao ◽  
Li Wang ◽  
Qingxin Tang ◽  
Weili Li ◽  
...  
Keyword(s):  
Synthesis And Characterization ◽  
Aromatic Rings

A structure–property relationship study of bent-core mesogens with pyridine as the central unit

2014 ◽  
Vol 38 (4) ◽  
pp. 1751-1760 ◽  
Author(s):  
J. M. Marković ◽  
N. P. Trišović ◽  
T. Tóth-Katona ◽  
M. K. Milčić ◽  
A. D. Marinković ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Pyridine Ring ◽  
Synthesis And Characterization ◽  
Central Unit ◽  
Structure Property ◽  
Aromatic Rings ◽  
Property Relationship ◽  
Structure Property Relationship ◽  
Relationship Study

The synthesis and characterization of pyridine bent-core liquid crystals are reported. Some compounds exhibit B1 and B7 mesophases. Lower and wider mesophase ranges are obtained by decreasing the polarity of linkers between the pyridine ring and the inner aromatic rings, and increasing the length of terminal chains.

scholarly journals Synthesis and Characterization of 4-Aryl-4H-chromenes from H-Cardanol

2014 ◽  
Vol 9 (9) ◽  
pp. 1934578X1400900
Author(s):  
Hulluru Surya Prakash Rao ◽  
Mani Kamalraj
Keyword(s):  
Low Cost ◽  
Anacardium Occidentale ◽  
Side Chain ◽  
Synthesis And Characterization ◽  
Aromatic Rings ◽  
Cashew Nut ◽  
Locally Grown

We have synthesized and characterized a variety of fat-soluble, low-melting and medicinally useful 4-aryl-4 H-chromenes from H-cardanol (side-chain perhydrogenated cardanol, 3-pentadecylphenol), a renewable and low-cost product from locally grown cashew nut trees ( Anacardium occidentale L.). We incorporated H-cardanol into the aromatic rings of either 4 H-chromene or phenol, or both. Substitution of C4SMe in N-methyl-4-(methylthio)-3-nitro-4 H-chromene-2-amines with H-cardanol was regio-specific at the C6 position.

scholarly journals Synthesis and Characterization of Amphiphilic Arenephosphonates as Water-Soluble Micellular Radioluminescent Probes

2020 ◽  
Author(s):  
David French ◽  
Jay G. Simmons ◽  
Henry Everitt ◽  
Stephen H. Foulger ◽  
Gary M. Gray
Keyword(s):  
Micelle Formation ◽  
Secondary Emission ◽  
Water Soluble ◽  
Synthesis And Characterization ◽  
Excitation Wavelength ◽  
Aromatic Rings ◽  
Compound A ◽  
Emission Profile ◽  
Phosphonate Esters

<div>Abstract</div><div>This work describes the synthesis and characterization of a series of arenephosphonic acid salts for use as water soluble down-converters in optogenetic assays.</div><div>Two phosphonate salts based on anthracene and naphthalene were synthesized through</div><div>cleavage of phosphonate esters. A third amphiphilic salt, developed from a long-alkylchain modified naphthalene, was produced in the same manner to demonstrate micelle</div><div>formation. Two techniques were used to determine if any of the salts showed micelle</div><div>behavior: 31P NMR and fluorescence spectroscopy. Interestingly, all three compounds</div><div>exhibited micelle formation in water. UV-induced fluorescence of NapPONa and</div><div>AntPONa revealed a secondary emission profile with maximum excitation wavelengths</div><div>that lie on top of the primary emission profile. This secondary emission can be attributed</div><div>to the emission of the micellular structure based on solid-state fluorescence experiments.</div><div>Moderate x-ray induced radioluminescence was observed in the solid forms of each</div><div>compound. A solution of amphiphilic NapPONa demonstrated both concentrationdependent and micelle-dependent radioluminescence, indicating the positioning of</div><div>aromatic rings in a micelle is inducive to a radioluminescent response. Furthermore, the</div><div>emission wavelength of this compounds lies on top of the excitation wavelength of</div><div>channelrhodopsin-2, a well-studied optogenetic target.</div>

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