Integrating radical (open‐shell) species into non‐cryogenic nanodevices is key to unlocking the potential of molecular electronics. While many efforts have been devoted to this issue, in the absence of a chemical/electrochemical potential the open‐shell character is generally lost in contact with the metallic electrodes. Herein, single‐molecule devices incorporating a 6‐oxo‐verdazyl persistent radical have been fabricated using break‐junction techniques. The open‐shell character is retained at room temperature, and electrochemical gating permits in situ reduction to a closed‐shell anionic state in a single‐molecule transistor configuration. Furthermore, electronically driven rectification arises from bias‐dependent alignment of the open‐shell resonances. The integration of radical character, transistor‐like switching, and rectification in a single molecular component paves the way to further studies of the electronic, magnetic, and thermoelectric properties of open‐shell species.
PurposeTo provide a comprehensive systematic review of entrepreneurship in the context of emerging markets (EMs). The area of research is topical considering the rise of EMs on the global scene and the importance of entrepreneurship in the development of EMs.Design/methodology/approachThe paper utilizes scientometrics to provide a systematic review of the emerging field of entrepreneurship in EMs (EEMs). The entire Web of Science database was searched, and 2,568 scholarly outputs were extracted and analyzed as a result. The review further compares the EEMs research to the mainstream entrepreneurship research based on the top trending and high impact themes, demonstrates which countries published and are studied in the EEMs scholarship, and finally, it provides a proportion of empirical research done on EEMs to highlight methods utilized in the existing research.FindingsThe scientometric review reveals three broad domains of the EEMs scholarship–(1) Entrepreneurship in EMs and its implications; (2) MNEs, institutional environments, and FDI; and (3) Strategy, innovation and performance. The findings demonstrate that EEMs' scholarship primarily discusses environments within which EEMs takes place, the implications of EEMs, strategy and performance of EEMs (macro and meso-levels), thus highlighting the need for micro-level (individual-based) analysis of EEMs. Approximately, a third of the EEMs research is of empirical nature, more should be done especially in quantitative studies to develop this field further.Originality/valueThis research is unique in providing the largest review of EEMs scholarship. It divides the entire scholarship into three inter-related research streams and identifies future research directions in this immensely important field of research.
A series of diarylacetylene (tolane) derivatives functionalised at the 4-and 4 0 -positions by thiolate, thioether, or amine groups capable of serving as anchor groups to secure the molecules within a molecular junction have been prepared and characterised. The series of compounds have a general form X-B-X, Y-B-Y, and X-B-Y where X and Y represent anchor groups and B the molecular bridge. The single-molecule conductance values determined by the scanning tunnelling microscope break-junction method are found to be in excellent agreement with the predictions made on the basis of a recently proposed 'molecular circuit law', which states 'the conductance G XBY of an asymmetric molecule X-B-Y is the geometric mean ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi G XBX G YBY p of the conductance of the two symmetric molecules derived from it, G XBX and G YBY .' The experimental verification of the circuit law, which holds for systems in which the constituent moieties X, B, and Y are weakly coupled and whose conductance takes place via off-resonance tunnelling, gives further confidence in the use of this relationship in the design of future compounds for use in molecular electronics research.
Molecular junctions have proven invaluable tools through which to explore the electronic properties of molecules and molecular monolayers. In seeking to develop a viable molecular electronics based technology it becomes...
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