A nanoparticle-assisted preparation of chiral patterning technology and its application
A metal nanoparticle, chirality technology, applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, organic chemistry, etc. strong effect
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[0016] The invention provides a kind of preparation method of chiral polydiacetylene, comprising:
[0017] The metal nanoparticles modified by cysteine are added dropwise on the surface of the diacetylene monomer molecular film, and then irradiated by achiral ultraviolet light to obtain chiral polydiacetylene.
[0018] According to the present invention, the metal nanoparticles modified by cysteine are metal nanoparticles modified by L-cysteine or metal nanoparticles modified by D-cysteine; A stable covalent bond is formed between the thiol functional group on the molecule and the metal. Wherein, the metal nanoparticles are preferably silver nanoparticles, gold nanoparticles, platinum nanoparticles or copper nanoparticles, more preferably silver nanoparticles; in the present application, the preparation method of the cysteine-modified metal nanoparticles Preferably, it is prepared by adding L-cysteine or D-cysteine solution dropwise into the metal nanoparticle solut...
Embodiment 1
[0030] The synthesis method of spherical silver nanoparticles is as follows: first add 20 mL of ethylene glycol solution to a 50 mL round bottom flask, add 1 gram of PVP (polyvinylpyrrolidone, K-30) after heating up to 60 ° C, and stir to make the PVP completely dissolve in ethylene glycol , a transparent liquid was obtained. Then the system was heated up to 120°C, and 80 mg of AgNO was added 3 , stirred for 1 h to obtain a bright yellow transparent liquid. Using the method of ultracentrifugation (speed 13000rpm, duration 20min), take out the supernatant, redisperse the yellow-brown solid with ultrapure water, wash and centrifuge repeatedly three times, purify the silver nanoparticles, and remove unreacted ethylene glycol and PVP. The washed silver nanoparticle aqueous solution was stored in the refrigerator until use.
[0031]The spherical silver nanoparticles were characterized by ultraviolet-visible absorption spectrum, and it was found that the spherical silver nanoparti...
Embodiment 2
[0033] Take 4 mL of the newly synthesized spherical silver nanoparticle solution, place it in a 25 mL round bottom flask, and stir it with a magnet. Slowly add 5*10 -4 M's L- / D-Cys aqueous solution 600 μL, constant temperature water bath 25 ℃ for half an hour. After the reaction, a centrifuge (12000 rpm, 20 min) was used to remove the cysteine that was not attached to the silver nanoparticles, and the deposited cysteine chiral-modified spherical nanoparticles were redispersed with ultrapure water. The L- / D-cysteine chiral modified silver nanoparticles can be obtained.
[0034] The chiral modified silver nanoparticle aggregates were characterized by circular dichroism spectrum, and the circular dichroism spectrum is shown in figure 2 . figure 2 It is the circular dichroism spectrum of the spherical silver nanoparticles after L- / D-cysteine chiral modification obtained in Example 2.
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