Minutes of the 1984 Meetings of the Comediantes

Whitaker, Shirley B.

doi:10.1353/boc.1985.0016

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Form III was crystallized from a melt of form II by cooling from 175 to 50 °C at 1 °C/min. Molecules in all three forms are nearly planar and are in the keto-hydrazone tautomeric form (Figure ), consistent with Yellow 14 and studies on the solid-state chemistry of related azo pigments. ,− Furthermore, all three forms crystallize in P 1̄, and forms I and III pack with sheetlike structures similar to Yellow 14 3 Thermal ellipsoid plot of Maize 1. …”

Section: Resultssupporting

confidence: 76%

“…Molecules in all three forms are nearly planar and are in the keto-hydrazone tautomeric form (Figure 2), consistent with Yellow 14 and studies on the solid-state chemistry of related azo pigments. 17,[21][22][23][24][25][26][27][28] Furthermore, all three forms crystallize in P1 h, and forms I and III pack with sheetlike structures similar to Yellow 14. 17 Form I has two equivalent molecules in the unit cell (Figure 4) and two intramolecular hydrogen bonds between N(1)-H‚‚‚O(1) and N(3)-H‚‚‚O(2) with lengths of 1.73 and 1.74 Å, respectively.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Maize 1: A Trimorphic Azo Pigment

Price

Grzesiak

Kampf

et al. 2003

Crystal Growth & Design

View full text Add to dashboard Cite

We report the discovery of a trimorphic azo pigment, 2-[(2-chloro-phenyl)-hydrazono]-3-oxo-N-o-tolyl-butyramide (Maize 1) and spectroscopic and thermal properties of its forms. Single-crystal X-ray diffraction reveals that the three polymorphs all crystallize in the space group P1̄, with forms I and III packing in sheets and form II having a herringbone packing pattern. This pigment exists as the keto-hydrazone tautomer and is nearly planar in each form. The molecular conformation in the crystal is similar to its diarylide pigment analogues. In contrast to many other polymorphic pigments, the color differs very little among forms of Maize 1.

show abstract

Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Maize 1: A Trimorphic Azo Pigment

Price

Grzesiak

Kampf

et al. 2003

Crystal Growth & Design

View full text Add to dashboard Cite

show abstract

“…Pigment Yellow 5 ( Figure 14) the X-ray patterns are very similar ( Figure 15) and suggest isomorphism. This has, in fact, been confirmed by singlecrystal structure determinations [40,41]. But isomorphs need not have similar patterns and on occasions isomorphism has been claimed when the X-ray patterns are completely different, e.g.…”

Section: Isomorphsmentioning

confidence: 84%

The Value of X‐ray Powder Diffraction Analysis in Colour Chemistry

Whitaker

1986

Journal of the Society of Dyers and Colourists

View full text Add to dashboard Cite

After discussing some of the basic ideas, advantages and disadvantages of X‐ray powder diffraction analysis, it is pointed out that at present a major disadvantage for colour chemists is the lack of a special sub‐file of suitable standard X‐ray data. A plea is made for colleagues to report their data, forthe Journal to act as a depository and for the Society to consider the feasibility of separate data sub‐file of use to colour chemists and dyers, persuading the Joint Committee on Powder Diffraction Standards (JCPDSj to set one up. The article then proceeds to illustrate the usefulness of the technique to problems in colour chemistry. The effects on the X‐ray powder pattern of the crystal size, polymorphism, isomers, and solid solutions and mixed crystals are discussed. This is illustrated with examples from the work of the author and other investigators. The paper concludes by looking at the application of the X‐ray powder method to the analysis of vat dyes on various fabrics.

show abstract

Minutes of the 1984 Meetings of the Comediantes

Cited by 2 publications

References 0 publications

Maize 1: A Trimorphic Azo Pigment

Maize 1: A Trimorphic Azo Pigment

The Value of X‐ray Powder Diffraction Analysis in Colour Chemistry

Contact Info

Product

Resources

About