Showing papers by "Georgios C. Vougioukalakis published in 2015"
TL;DR: In this paper, a comprehensive overview of all CO2 activation transformations catalyzed by copper and iron-based transition metal complexes is presented, and a detailed analysis of the transition metal catalysts is provided.
66 citations
TL;DR: This Minireview focuses on a powerful strategy developed to address problems of dye-sensitized solar cells, namely the use of co-adsorbents.
Abstract: Since the establishment of dye-sensitized solar cells in the early '90s, both the efficiency and stability of these third generation photovoltaics have been greatly enhanced. Nevertheless, there still exist many unwanted processes that impede operation of dye-sensitized solar cells, encumbering the achievement of the maximum theoretical power conversion efficiency and decreasing the devices' long-term operation. These processes include charge recombination, dye aggregation, dye desorption, and high protonation degrees of the semiconductor's surface. This Minireview focuses on a powerful strategy developed to address these problems, namely the use of co-adsorbents. All types of co-adsorbents utilized thus far are categorized in terms of the chemical identity of their anchoring group; in addition their operational mechanisms are presented and the properties that a functional molecule should possess to be applied as an efficient co-adsorbent are discussed.
46 citations
TL;DR: The highest light‐induced toxicity was conferred by the photosensitizers bearing Cl− counterions, probably due to the looser ionic “chaperoning” of Cl−, in comparison to PF6−, leading to higher cell internalization.
Abstract: A new family of Ru(II)-based photosensitizers was synthesized and systematically characterized. The ligands employed to coordinate the ruthenium metal center were the commercially available 2,2'-bipyridine and a pyridine-quinoline hybrid bearing an anthracene moiety. The complexes obtained carry either PF6- or Cl(-) counterions. These counterions determine the complexes' hydrophobic or hydrophilic character, respectively, therefore dictating their solubility in biologically related media. All photosensitizers exhibit characteristic, relatively strong and wide UV-Vis absorption spectral profiles. Their high efficiency in generating cytotoxic singlet oxygen was established (up to ΦΔ ~0.8). Moreover, the interaction of these photosensitizers with double-stranded DNA was studied fluoro- and photospectroscopically and their binding affinities were found to be of the order of 3 × 10(7) M(-1) . All complexes are photocytotoxic to DU145 human prostate cancer cells. The highest light-induced toxicity was conferred by the photosensitizers bearing Cl(-) counterions, probably due to the looser ionic "chaperoning" of Cl(-) , in comparison to PF6-, leading to higher cell internalization.
8 citations
TL;DR: In this article, the progress that has been reported towards producing GNRs with predefined dimensions, by using bottom-up chemical synthesis approaches, is discussed, and the progress is discussed in detail.
Abstract: Graphene is a two-dimensional atom-thick sheet of graphite composed of an sp-hybridized carbon atom network. Its isolation in 2004 and the extensive research that followed have led, amongst others, to graphene nanoribbons (GNRs), a graphene-based structure having nano-scale dimensions and semiconducting or metallic electronic properties that depend on its geometry and dimensions. These characteristics of GNRs are in stark contrast to those of graphene, which is a carbon sheet with semimetal, zero band gap characteristics. In the present article, we discuss the progress that has been reported towards producing GNRs with predefined dimensions, by using bottom-up chemical synthesis approaches.
6 citations
Journal Article•
2 citations