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Tunable Synchronicity of Molecular Valence Tautomerism with Macroscopic Solid-Liquid Transition by Molecular Lattice Engineering.
- Source :
-
Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2021 Nov 25; Vol. 27 (66), pp. 16354-16366. Date of Electronic Publication: 2021 Oct 19. - Publication Year :
- 2021
-
Abstract
- The combination of a cobalt-dioxolene core that exhibits valence tautomerism (VT) with pyridine-3,5-dicarboxylic acid functionalized with chains bearing two, four, or six oxyethylene units led to new complexes ConEGEspy (n = 2, 4, and 6). These complexes commonly form violet crystals of the low-spin (ls)-[Co <superscript>III</superscript> (nEGEspy) <subscript>2</subscript> (3,6-DTBSQ)(3,6-DTBCat)] (ls-[Co <superscript>III</superscript> ], 3,6-DTBSQ = 3,6-di-tert-butyl semiquinonato, 3,6-DTBCat = 3,6-di-tert-butyl catecholato). Interestingly, violet crystals of Co2EGEspy in the ls-[Co <superscript>III</superscript> ] transitioned into a green liquid, accompanied by an almost complete VT shift (94 %) to the high-spin (hs)-[Co <superscript>II</superscript> (nEGEspy) <subscript>2</subscript> (3,6-DTBSQ) <subscript>2</subscript> ] (hs-[Co <superscript>II</superscript> ]) upon melting. In contrast, violet crystals of Co4EGEspy and Co6EGEspy in the ls-[Co <superscript>III</superscript> ] exhibited partial VT (33 %) and only a 9.3 % VT shift after melting, respectively. These data demonstrate the tunability of the synchronicity of the molecular VT and macroscopic solid-liquid transitions by optimizing the tethered chains, thus establishing a new strategy for coupling bistable molecules with the macroscopic world.<br /> (© 2021 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-3765
- Volume :
- 27
- Issue :
- 66
- Database :
- MEDLINE
- Journal :
- Chemistry (Weinheim an der Bergstrasse, Germany)
- Publication Type :
- Academic Journal
- Accession number :
- 34590361
- Full Text :
- https://doi.org/10.1002/chem.202103090