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Zhang, Boyuan ; Garner, Marc H. ; Li, Liang , et al. Chem. Sci.,2021,12(30):10299-10305. DOI: 10.1039/d1sc02287c PubMed ID: 34476051
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Abstract: Designing highly insulating sub-nanometer mols. is difficult because tunneling conductance increases exponentially with decreasing mol. length. This challenge is further enhanced by the fact that most mols. cannot achieve full conductance suppression with destructive quantum interference. Here, we present results for a series of small saturated heterocyclic alkanes where we show that conductance is suppressed due to destructive interference. Using the STM-BJ technique and d. functional theory calculations, we confirm that their single-mol. junction conductance is lower than analogous alkanes of similar length. We rationalize the suppression of conductance in the junctions through anal. of the computed ballistic c.d. We find there are highly sym. ring currents, which reverse direction at the antiresonance in the Landauer transmission near the Fermi energy. This pattern has not been seen in earlier studies of larger bicyclic systems exhibiting interference effects and constitutes clear-cut evidence of destructive σ-interference. The finding of heterocyclic alkanes with destructive quantum interference charts a pathway for chem. design of short mol. insulators using organic mols.
Purchased from AmBeed: 16011-97-5
CAS No. : | 16011-97-5 | MDL No. : | MFCD00039799 |
Formula : | C6H16N2 | Boiling Point : | - |
Linear Structure Formula : | CH3NH(CH2)4NHCH3 | InChI Key : | CZPRYVBLOUZRGD-UHFFFAOYSA-N |
M.W : | 116.20 | Pubchem ID : | 85238 |
Synonyms : |
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Chemical Name : | N1,N4-Dimethylbutane-1,4-diamine |
Signal Word: | Danger | Class: | 8,3 |
Precautionary Statements: | P260-P280-P284-P305+P351+P338-P310 | UN#: | 2920 |
Hazard Statements: | H226-H302+H312-H314-H330 | Packing Group: | Ⅱ |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
at 60℃; for 2h;Cooling with ice; | (2) Under ice cooling, 31.9 g of N,N'-dimethyl-1,4-butanediamine was added dropwise to the reaction system, and after the completion of the dropwise addition, the temperature was raised to 60 C, and the reaction was continued for 2 hours; (3) After the reaction is completed, the temperature is lowered to room temperature, and the product is washed 2-3 times with deionized water, and then washed 2-3 times with a 1 wt% aqueous NaOH solution.Finally, it is washed with deionized water to neutrality, transferred to a beaker, added with an appropriate amount of anhydrous sodium sulfate, dried for 24 hours, and filtered to obtain a methacrylate monomer for a dental restorative material |