Author
Ray J. Butcher
Other affiliations: University of Washington, Bhabha Atomic Research Centre, Indian Institutes of Technology ...read more
Bio: Ray J. Butcher is an academic researcher from Howard University. The author has contributed to research in topics: Dihedral angle & Ring (chemistry). The author has an hindex of 47, co-authored 1237 publications receiving 13860 citations. Previous affiliations of Ray J. Butcher include University of Washington & Bhabha Atomic Research Centre.
Papers published on a yearly basis
Papers
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TL;DR: Screening of the compounds for their cytotoxicities against T-lymphoblastic leukemia cancer cells has shown that the acetone Schiff base of S-methyldithiocarbazate (Hasme) exhibits a very weak activity, whereas the S-benzyl derivative (Hasbz) is inactive.
204 citations
TL;DR: A colorimetric anion sensor was developed using the Schiff base formed from the condensation of salicylaldehyde and 2-amino-4-nitrophenol under microwave irradiation as discussed by the authors.
Abstract: A colorimetric anion sensor was developed using the Schiff base formed from the condensation of salicylaldehyde and 2-amino-4-nitrophenol under microwave irradiation. The Schiff base portrayed a color change upon addition of fluoride, acetate and dihydrogen phosphate (DHP) ions with a substantial bathochromic shift from 342 to 450 nm. No significant color change was observed upon addition of other anions such as chloride, bromide, perchlorate, and hydrogen sulfate. The binding constants showed the binding order AcO − ≈ F − ≫ H 2 PO 4 − . Job plots indicated the formation of a (1:1) complex (receptor:anion) with fluoride, acetate and DHP. Single crystal X-ray structure of the Schiff base indicated that the compound exists in the keto-amine tautomer in the solid state.
129 citations
TL;DR: In this paper, a series of low-valent organoselenium compounds were synthesized, characterized, and examined for nonbonding and non-bonding interactions, and a correlation between Se···N intramolecular distance and 77 Se chemical shift was attempted.
Abstract: A series of novel low-valent organoselenium compounds stabilized by Se···N intramolecular
interactions (such as the one in the figure) were synthesized, characterized, and examined for Se···N nonbonding
interactions. A correlation between Se···N intramolecular distance and 77 Se chemical shift is
attempted.
109 citations
TL;DR: Bright blue Cu(Dipica)(2)(BF(4))(2) crystallizes in the monoclinic space group P2(1)/n, and solution properties offer no clear distinction between the two cation stereochemistries.
Abstract: Bright blue Cu(Dipica)2(BF4)2 crystallizes in the monoclinic space group P21/n, with unit cell parameters a = 23.406(6) A, b = 9.338(2) A, c = 25.573(7) A, β = 95.39(2)°, and Z = 8. The structure was solved by conventional Patterson and Fourier methods. The R and Rw values for 5282 observed reflections were 7.06% and 9.10% respectively. Two structurally different complex cations are present in the same unit cell, one hexacoordinate and the other pentacoordinate. In the hexacoordinate cation, the two tridentate bis(2‘-picolyl)amine ligands are trans-facially coordinated with two pyridine nitrogens and the two secondary amine nitrogens situated on four positions in a plane [Cu−Npyr = 2.189(6), 2.146(6) A; Cu−Nsat = 2.207(6), 2.201(5) A]. The remaining two pyridine nitrogens constitute the axis [Cu−Npyr = 2.035(5), 2.038(5) A] in an equatorially expanded pseudooctahedral geometry. The pentacoordinate cation possesses a square-pyramidal configuration, the two secondary nitrogens being mutually cis, with one D...
105 citations
TL;DR: Schiff bases of 2-hydroxybenzophenone (HBP) have been synthesized and characterized by proton, carbon-13, selenium-77 and tellurium-125 NMR, IR and mass spectra as mentioned in this paper.
99 citations
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TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.
Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …
33,785 citations
Journal Article•
28,685 citations
01 Jan 2016
TL;DR: The principles of fluorescence spectroscopy is universally compatible with any devices to read and is available in the digital library an online access to it is set as public so you can download it instantly.
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2,960 citations