Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 48 , Issue 1
Showing 1-14 articles out of 14 articles from the selected issue
Highlight Review
  • Leo D. M. Nicholls, Manuel Alcarazo
    2019 Volume 48 Issue 1 Pages 1-13
    Published: January 05, 2019
    Released: January 05, 2019
    JOURNALS RESTRICTED ACCESS

    The unique architecture of α-cationic phosphanes, in which one or more positively charged groups are directly attached to the phosphorus center dramatically affects both the physicochemical properties of the corresponding ligands and their donor/acceptor properties. Specifically, the introduction of charges increase the solubility of the resulting ligand in polar media allowing the derived metal complexes to be utilized in highly polar solvents such as ionic liquids, or to be easily separated from typical organic media. On the other hand, the presence of a cationic group in close proximity to the donor position weakens the σ-donor ability of the P-atom when compared with neutral analogues, and concomitantly enhances the π-acceptor character of the resulting ligand. In this Highlight Review these aspects are overviewed, putting special emphasis on the implications for transition metal catalyzed processes. Recent developments are critically evaluated and future perspectives for this exciting area of ligand design are discussed.

    Typical ancillary ligands are anionic or neutral species. Cationic ones are exceptions and, when used, the positively charged groups are normally attached to the periphery and not close to the donating atom. However, a series of experimental results, which are reviewed here, suggest that the utility in catalysis of cationic phosphines with no spacer between the phosphorus atom and the positively charged groups (α-cationic phosphines) might be broader than anticipated. Fullsize Image
     
  • Hengyuan Wang, Qijing Wang, Yun Li
    2019 Volume 48 Issue 1 Pages 14-21
    Published: January 05, 2019
    Released: January 05, 2019
    JOURNALS RESTRICTED ACCESS

    Soluble organic semiconductors have been widely researched for a wide range of application scenarios, such as organic field-effect transistors (OFETs), organic light-emitting diodes and solar cells. Due to their unique characteristics and great potentials as a platform for exploiting charge transport, two-dimensional (2D) organic crystals are emerging to investigate the device physics in OFETs, which is essential for functional device applications. Here, 2D organic crystalline films are briefly introduced from the deposition to the applications in electronic devices.

    Soluble organic semiconductors have been widely researched for a wide range of application scenarios, such as organic field-effect transistors (OFETs) and other optoelectronic devices. Two-dimensional (2D) organic crystals are emerging to investigate the device physics in OFETs, which is essential for functional device applications. Here, 2D organic films are briefly introduced from the deposition to the applications in electronic devices. Fullsize Image
     
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