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Rhenium(I) based irregular pentagonal-shaped metallacavitands

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Neutral ditopic flexible N-donor ligands (Ln = bis(4-(naphtho[2,3-d]imidazol-1-ylmethyl)phenyl)methane, L1 bis(4-(benzimidazol-1-ylmethyl)phenyl)methane, L2 or bis(4-(2-nonylbenzimidazol-1-ylmethyl)phenyl)methane, L3) possessing a bis(4-methylphenyl)methane spacer with two imidazolyl donor units were designed and synthesized. The ligands were utilized to develop metallacavitands analogous to irregular pentagonal-shaped metallacavitands with larger cavities. The metallacavitands 1–4 were assembled from Re2(CO)10, a rigid bis-chelating donor (1,4-dihydroxy-9,10-anthraquinone or chloranilic acid) and Ln via a solvothermal approach. The ligands and the metallacavitands were characterized by analytical and spectroscopic methods. The molecular structures of 1 and 4 were further confirmed by single crystal X-ray diffraction analysis which revealed that a toluene molecule resides in the hydrophobic cavity. Ln and 1–4 are emissive in DMSO at room temperature. The internal cavity of the metallacavitand acts as a host for aromatic guest molecules. The host–guest interaction properties of 1 with anthracene, naphthalene, nitrobenzene, 2-nitrotoluene, 4-nitrotoluene and 2,4-dinitrotoluene were studied by an emission spectroscopic method.

Graphical abstract: Rhenium(i) based irregular pentagonal-shaped metallacavitands

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The article was received on 10 Feb 2018, accepted on 23 Feb 2018 and first published on 23 Feb 2018

Article type: Paper
DOI: 10.1039/C8DT00574E
Citation: Dalton Trans., 2018, Advance Article
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    Rhenium(I) based irregular pentagonal-shaped metallacavitands

    M. Bhol, B. Shankar and M. Sathiyendiran, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT00574E

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