Abstract
Tetraruthenium macrocycles with 1,4-divinylphenylene and diarylamine-substituted isophthalic acids as the sides display up to eight one-electron redox steps and rich electrochromic behaviour with strong absorptions of the dications in the near infrared and of the tetra- and hexacations at low energies in the visible.
Highlights
Tetraruthenium macrocycles with 1,4-divinylphenylene and diarylaminesubstituted isophthalic acids as the sides display up to eight one-electron redox steps and rich electrochromic behaviour with strong absorptions of the dications in the near infrared and of the tetra- and hexacations at low energies in the visible
The elegant work of Hupp and coworkers, who explored charge transfer between diimine or porphyrinic linkers in mixed-valent tetrarhenium rectangles with ligand-based redox activity,[7,8,9,10] and of Kaim, Stang and Therrien on tetraplatinum, -rhenium or -ruthenium metallacycles with oxidizable or reducible linkers stand as instructive examples.[11,12,13,14,15,16]
We here report on tetraruthenium metallacycles which are constructed from two pairs of diruthenium 1,4-divinylphenyleneand triarylamine-derived ditopic linkers as two different kinds of redox-active entities that allow for the pairwise release of up to eight electrons per macrocycle resulting in strong polyelectrochromism.[17,18,19]
Summary
Tetraruthenium macrocycles with 1,4-divinylphenylene and diarylaminesubstituted isophthalic acids as the sides display up to eight one-electron redox steps and rich electrochromic behaviour with strong absorptions of the dications in the near infrared and of the tetra- and hexacations at low energies in the visible. We here report on tetraruthenium metallacycles which are constructed from two pairs of diruthenium 1,4-divinylphenyleneand triarylamine-derived ditopic linkers as two different kinds of redox-active entities that allow for the pairwise release of up to eight electrons per macrocycle resulting in strong polyelectrochromism.[17,18,19] Discrete divinylphenylene-bridged
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