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<p>Reported here is a new series of guest-free and guest-filled frameworks with charge-assisted hydrogen bonds between anionic metal complexes and cationic organic moieties. The latter are the tri-protonated 2,4,6-Tris(4-pyridyl)-1,3,5-triazinium (H<sub>3</sub>4tpt)<sup>3+</sup> or 2,4,6-Tris(3-pyridyl)-1,3,5-triazine (H<sub>3</sub>3tpt)<sup>3+</sup> trications while the metal complex is the trianionic [Fe(ox)<sub>3</sub>]<sup>3−</sup>. The aryl derivatives 4-methoxyphenol (mp), 1,5-dihydroxynaphthalene (dhn), 2-naphthol, and methyl-4-aminobenzoate (mab) were used as guests the framework. In addition to van der Waals interactions with the host framework, these aromatic guest molecules exhibit also donor–acceptor interactions with the aromatic trigonal-planar triazinium-based linkers. The general formula of the guest-filled frameworks is [tpt][Fe(ox)<sub>3</sub>]·<i>m</i>[guest]·<i>n</i>[solvent] with <i>m</i> reaching 3 in some of the compounds. The fact that guest-filled frameworks can be prepared with both (H<sub>3</sub>4tpt)<sup>3+</sup> and (H<sub>3</sub>3tpt)<sup>3+</sup> demonstrates the flexibility of these soft frameworks where the nitrogen position in the pyridyl groups does not affect their capability to include guests.</p> Graphical Abstract <p>Flexible empty and guest filled hydrogen bonded frameworks of tricationic triazinium linkers and trianinonic [Fe(ox)<sup>3</sup>]<sup>3−</sup> nodeswere reported. The donor-acceptor and van der Waals interaction between the triangular triazinium linkers and guest molecules was confirmed by single crystal structure and spectroscopic methods.</p>

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Host–Guest Hydrogen-Bonded Inclusion Frameworks Made of [Fe(ox)3]3– Anionic Nodes and Tri-pyridyl-triazinium Cationic Linkers

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • M. Jaya Prakash,
  • Allen G. Oliver,
  • Slavi C. Sevov

摘要

Reported here is a new series of guest-free and guest-filled frameworks with charge-assisted hydrogen bonds between anionic metal complexes and cationic organic moieties. The latter are the tri-protonated 2,4,6-Tris(4-pyridyl)-1,3,5-triazinium (H34tpt)3+ or 2,4,6-Tris(3-pyridyl)-1,3,5-triazine (H33tpt)3+ trications while the metal complex is the trianionic [Fe(ox)3]3−. The aryl derivatives 4-methoxyphenol (mp), 1,5-dihydroxynaphthalene (dhn), 2-naphthol, and methyl-4-aminobenzoate (mab) were used as guests the framework. In addition to van der Waals interactions with the host framework, these aromatic guest molecules exhibit also donor–acceptor interactions with the aromatic trigonal-planar triazinium-based linkers. The general formula of the guest-filled frameworks is [tpt][Fe(ox)3]·m[guest]·n[solvent] with m reaching 3 in some of the compounds. The fact that guest-filled frameworks can be prepared with both (H34tpt)3+ and (H33tpt)3+ demonstrates the flexibility of these soft frameworks where the nitrogen position in the pyridyl groups does not affect their capability to include guests.

Graphical Abstract

Flexible empty and guest filled hydrogen bonded frameworks of tricationic triazinium linkers and trianinonic [Fe(ox)3]3− nodeswere reported. The donor-acceptor and van der Waals interaction between the triangular triazinium linkers and guest molecules was confirmed by single crystal structure and spectroscopic methods.