Browsing by Author "Kumar, Yogesh"

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    Cucurbit[7]uril-anchored porphyrin-based multifunctional molecular platform for photodynamic antimicrobial and cancer therapy
    (American Chemical Society, 2019) Özkan, Melis; Kumar, Yogesh; Keser, Yağmur; Hadi, Seyed E.; Tuncel, Dönüş
    Here we report a photoactive supramolecular assembly that is multifunctional and constructed by covalently linking four receptor molecules (cucurbit[7]uril) to a porphyrin derivative with suitable linkers. While this molecular platform serves very efficiently as a light-triggered broad-spectrum antibacterial agent, owing to its negligible dark cytotoxicity and the presence of host molecules (CB7), it can also be utilized as a vehicle to carry drug molecules for a combined chemo and photodynamic cancer therapy.
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    Novel supramolecular photocatalyst based on conjugation of cucurbit[7]uril to non-metallated porphyrin for electrophotocatalytic hydrogen generation from water splitting
    (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2019) Kumar, Yogesh; Patil, Bhushan; Khaligh, Aisan; Hadi, Seyed E.; Uyar, Tamer; Tuncel, Dönüş
    Visible‐light triggerable, stable, organic material‐based photocatalysts that can function in alkaline media without the necessity of sacrificial agent for hydrogen production are highly sought after. Here, we report a novel supramolecular photocatalyst that confers the aforementioned features. This supramolecular photocatalyst (TPP‐4CB7) is synthesized through the conjugation of monohydroxylated cucurbit(7)uril (CB7) hosts to a suitably substituted tetraphenyl porphyrin. Although TPP‐4CB7 by its own preforms as an efficient visible light triggered photocatalyst, the hydrogen production efficiency is significantly enhanced upon mixing with TiO2. The resulting nanocomposite (TPP‐CB‐TiO2@Pt) is observed to exhibit remarkable electrophotocatalytic activity under visible light and produces hydrogen (onset potential −10 mV, turn over frequency (TOF) 0.202 s−1, 24.5 mmol h−1 g−1) from water splitting without any significant degradation during four runs (5 h each) in alkaline media and in the absence of sacrificial agent.
  • Thumbnail Image
    ItemOpen Access
    Novel supramolecular photocatalyst based on conjugation of cucurbit[7]uril to non-metallated porphyrin for electrophotocatalytic hydrogen generation from water splitting 
    (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2019) Kumar, Yogesh; Patil, Bhushan; Khaligh, Aisan; Hadi, Seyed E.; Uyar, Tamer; Tuncel, Dönüş
    The front cover artwork for Issue 13/2019 is provided by Tuncel and co‐workers at UNAM and the Chemistry Department of Bilkent University (Turkey). The image shows solar energy promoted photoelectrocatalytic water splitting for hydrogen generation using a supramolecular photocatalyst. See the Communication itself at https://doi.org/10.1002/cctc.201900144.