Fluorination of supramolecular liquid crystals – tuning tool and analytical probe

The impact of fluorination on the properties of photo-responsive hydrogen-bonded liquid crystals is reported and19F solid-state NMR studies provide insight into the molecular alignment of the assemblies.

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Insight into the chromophore of rhodopsin and its Meta-II photointermediate by 19F solid-state NMR and chemical shift tensor calculations

Physical Chemistry Chemical Physics ◽

10.1039/c8cp05886e ◽

2018 ◽

Vol 20 (48) ◽

pp. 30174-30188 ◽

Cited By ~ 1

Author(s):

Andreas Brinkmann ◽

Ulrich Sternberg ◽

Petra H. M. Bovee-Geurts ◽

Isabelle Fernández Fernández ◽

Johan Lugtenburg ◽

...

Keyword(s):

Solid State ◽

Chemical Shift ◽

Solid State Nmr ◽

Active State ◽

Chemical Shift Tensor ◽

Nmr Studies ◽

Polarization Theory ◽

Bond Polarization ◽

Insight Into

19F solid-state NMR studies together with bond polarization theory chemical shift tensor calculations provide insight into the chromophore of rhodopsin and its active state Meta II.

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Analysis of isotropic chemical shift data from high-resolution solid-state NMR studies of hydrogen-bonded organic compounds

Journal of Molecular Structure ◽

10.1016/0022-2860(90)80138-a ◽

1990 ◽

Vol 237 ◽

pp. 165-185 ◽

Cited By ~ 10

Author(s):

Margaret C. Etter ◽

Susan M. Reutzel ◽

Gail M. Vojta

Keyword(s):

Solid State ◽

High Resolution ◽

Chemical Shift ◽

Organic Compounds ◽

Solid State Nmr ◽

Isotropic Chemical Shift ◽

Nmr Studies ◽

Chemical Shift Data ◽

Shift Data ◽

Hydrogen Bonded

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Solid-State NMR Studies Of Ultramarine Pigments Discoloration

MRS Proceedings ◽

10.1557/proc-984-0984-mm07-13 ◽

2006 ◽

Vol 984 ◽

Cited By ~ 2

Author(s):

Eleonora Del Federico ◽

Jacob Newman ◽

Lindsey Tyne ◽

Cyndi O'Hern ◽

Licio Isolani ◽

...

Keyword(s):

Solid State ◽

Solid State Nmr ◽

Mas Nmr ◽

Nmr Studies ◽

Alkaline Environments ◽

Industrial Materials ◽

Ultramarine Pigments ◽

Insight Into

AbstractUltramarines are a family of pigments widely used as colorants in artists' paints, coatings, plastics, cosmetics, and various industrial materials. They are aluminosilicates characterized by a sodalite cage framework which enclarthrates paramagnetic (S3-., S2-.) and diamagnetic (S4or S3Cl) chromophores responsible for the color of these pigments. Solid-state27Al MAS NMR studies showed that the fading mechanisms in ultramarine pigments, both in acidic and alkaline environments, is initiated via de-alumination leading to framework destruction which in turn triggers the release of the chromophores. This results in color loss and in the emergence of extra-framework aluminum.29Si MAS studies provide new insight into these processes and suggest that acidic attack leads to the formation of Q1-Q3silicates and possibly to the emergence of Si(3Al), Si(2Al), Si(1Al) and Si(0Al) fragments indicative of the formation of secondary pores through which the guest chomophores can leave the cage. These findings are important for the design of proper conservation treatments and preservation procedures for artwork containing ultramarine pigments.

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