A stimuli-responsive double-stranded digold( i ) helicate

We report herein a stimuli-responsive dinuclear double stranded [Au 2 L 2 ] 2+ helicate assembled from gold( i ) atoms and phenyl-substituted diphosphine ligands derived from a xanthene-type backbone (L). The conformational flexibility of the dinuclear [Au 2 L 2 ] 2+ helicate allows a diversity of m...

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Bibliographic Details
Published in:CrystEngComm 2014-01, Vol.16 (15), p.3192-3202
Main Authors: Jobbágy, Csaba, Molnár, Miklós, Baranyai, Péter, Hamza, Andrea, Pálinkás, Gábor, Deák, Andrea
Format: Article
Language:English
Subjects:
Color
Colour
Emittance
Flexibility
Ligands
Luminescence
Molecular conformation
Stimuli
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Summary:We report herein a stimuli-responsive dinuclear double stranded [Au 2 L 2 ] 2+ helicate assembled from gold( i ) atoms and phenyl-substituted diphosphine ligands derived from a xanthene-type backbone (L). The conformational flexibility of the dinuclear [Au 2 L 2 ] 2+ helicate allows a diversity of molecular conformations and packing arrangements that lead to different solid-state emission colours. Blue (I B ), bluish green (II G ) and yellow (III Y ) emitting crystalline and red emitting (IV R ) amorphous forms of this double stranded [Au 2 L 2 ] 2+ helicate have been obtained by slight modification of the crystallization conditions. Different molecular conformations and packing arrangements of dinuclear double stranded [Au 2 L 2 ] 2+ helicates that result in different non-covalent interactions played the most significant role in tailoring the solid-state luminescence properties. On the basis of the single crystal structural data and photophysical studies, we found that an increasing number of intra- and mainly intermolecular noncovalent interactions locked and rigidified the twisted conformation of the double stranded [Au 2 L 2 ] 2+ helicate, and enhanced π-stacking between its aromatic units induced the red-shift in solid-state luminescence emission. The solid-state luminescence colour of this double stranded [Au 2 L 2 ] 2+ helicate can be switched reversibly from blue to red by external (mechanical and chemical) stimuli.
ISSN:1466-8033
1466-8033
DOI:10.1039/C3CE42474J