Formation of stable neutral copper bis-dithiolene thin films by potentiostatic electrodeposition

Dalgleish, Simon; Awaga, Kunio; Robertson, Neil

doi:10.1039/c1cc12344k

Cited by 13 publications

(12 citation statements)

References 25 publications

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“…With this method, the neutral complexes [Au(dpedt) 2 ] [79] and Cu(L11) 2 [109] have been prepared, recently. In most cases, the deprotection of the ligand precursor is made with MeONa in N 2 atmosphere and the addition of NiCl 2 at low temperature [22].…”

Section: Methodsmentioning

confidence: 99%

Neutral Metal 1,2-Dithiolenes: Preparations, Properties and Possible Applications of Unsymmetrical in Comparison to the Symmetrical

2012

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This paper is an overview concerning the preparations and properties as well as possible applications of neutral (one component) metal 1,2-dithiolenes (and selenium analogues). The structural, chemical, electrochemical, optical and electrical behavior of these complexes depend strongly on the nature of ligand and/or the metal. The results of unsymmetrical in comparison to those of symmetrical complexes related to the properties of materials in the solid state are primarily discussed. The optical absorption spectra exhibit strong bands in the near IR spectral region ca. 700 to ca. 1950 nm. X-ray crystal structure solutions show that the complexes usually have square-planar geometry with S-S and/or M-S contacts. Some of them behave as semiconductors or conductors (metals) and are stable in air. The cyclic voltammograms at negative potentials are different from the corresponding potentials of tetrathiafulvalenes (TTFs). As a consequence, the LUMO bands occur at much lower levels than those of TTFs. Consequently, electrical measurements under conditions of field effect transistors exhibit n-type or ambipolar behavior. Illumination of materials with high power lasers exhibits non-linear optical behavior. These properties enable metal 1,2-dithiolene complexes to be classified as promising candidates for optical and electronic applications, (e.g., saturable absorbers, ambipolar inverters). OPEN ACCESSCrystals 2012, 2 763

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Section: Methodsmentioning

confidence: 99%

Neutral Metal 1,2-Dithiolenes: Preparations, Properties and Possible Applications of Unsymmetrical in Comparison to the Symmetrical

2012

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“…Importantly, quantum coherence in this system persists up to room temperature with coherence times in the (sub)microsecond range. It is noteworthy that metal dithiolates have been investigated intensively, regarding their conductivity properties, and were shown to be semiconductors or possess metallic or-under pressure-even superconducting properties 28,29 , as well as being processable by thin film methods 30,31 .…”

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confidence: 99%

Room temperature quantum coherence in a potential molecular qubit

et al. 2014

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The successful development of a quantum computer would change the world, and current internet encryption methods would cease to function. However, no working quantum computer that even begins to rival conventional computers has been developed yet, which is due to the lack of suitable quantum bits. A key characteristic of a quantum bit is the coherence time. Transition metal complexes are very promising quantum bits, owing to their facile surface deposition and their chemical tunability. However, reported quantum coherence times have been unimpressive. Here we report very long quantum coherence times for a transition metal complex of 68 ms at low temperature (qubit figure of merit Q M ¼ 3,400) and 1 ms at room temperature, much higher than previously reported values for such systems. We show that this achievement is because of the rigidity of the lattice as well as removal of nuclear spins from the vicinity of the magnetic ion.

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“…Upon application of a potential corresponding to the first wave (0.5 V), a new band at about 1660 nm appears (see Figure S5), which is ascribed to the neutral complexes [15] on the basis of an intense π-π* transition. [16] This absorption is amplified as expected for a species whose concentration increases on the electrode surface. Upon application of the potential corresponding to the second wave, additional absorption bands at 1160, 1380 and 1420 nm appear (see Figure S5), the first one having previously been ascribed to the monocationic state of gold bis(dithiolene) complexes.…”

Section: Resultsmentioning

confidence: 75%

An Electropolymerisable Pyridine‐Functionalised Gold Bis(dithiolene) Complex

Oliveira¹,

Afonso²,

Dias³

et al. 2013

Eur J Inorg Chem

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A new pyridine-substituted dithiolene complex, PPh 4 [Au(4pdddt) 2 ] (3), was prepared and characterised. Cyclic voltammetry shows three redox processes corresponding to the interconversion between dianionic, monoanionic, neutral and cationic states, as often presented by this type of bis(dithiolene) complexes. However, the last oxidation process in this compound leads to a polymerised species obtained as[a] ITN/IST, Instituto Superior Técnico/CFMCUL, 3133 an electrodeposited film. By potentiostatic electrodeposition, thin films of either the neutral gold complex, [Au(4-pdddt) 2 ] (4), or the polymerised cationic species can be obtained. Both films absorb strongly in the NIR region and have properties consistent with the incorporation of the intact metal bis(dithiolene) complex. A mechanism for polymerisation through formation of S-S interligand bonds is proposed.

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Formation of stable neutral copper bis-dithiolene thin films by potentiostatic electrodeposition

Abstract: Thin films of neutral copper dithiolenes have been prepared by potentiostatic electrodeposition. This method allows the isolation of near infrared (NIR) active species, in a useable form, that are otherwise unobtainable by conventional chemical methods.

Cited by 13 publications

References 25 publications

Neutral Metal 1,2-Dithiolenes: Preparations, Properties and Possible Applications of Unsymmetrical in Comparison to the Symmetrical

Neutral Metal 1,2-Dithiolenes: Preparations, Properties and Possible Applications of Unsymmetrical in Comparison to the Symmetrical

Room temperature quantum coherence in a potential molecular qubit

An Electropolymerisable Pyridine‐Functionalised Gold Bis(dithiolene) Complex

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