Chapter 221: I will keep it secret for you

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The school bus driver swished away in the bus, and only three figures remained under the street lights.
"Oh, my God, see what I found?" Chen Wanqing's eyes swept over Xu Qiu and Han Jiaying.
Xu Qiu scratched his head and tried to explain, "I said I was passing by, do you believe it, senior sister."
Chen Wan glanced at him innocently and made an expression of "You don't seem to think I'm stupid", and said: "I have seen you two have a problem. I asked you yesterday and you lied to me, hum. "
Seeing the explanation to no avail, Xu Qiu generously pulled Han Jiaying to her side. The school girl blushed and did not resist.
This action was a bit of an oath of sovereignty, but the other party was a senior, and I always felt something strange.
According to his thoughts, the relationship between the two will be announced sooner or later anyway, and since it has been discovered, there is nothing to twitch.
Only the first day we were together, the second day was suspected, and then the relationship was exposed on the third day, everything was so bald.
Chen Wanqing didn't go into the matter of Xu Qiu's lie to her yesterday. Her gossip soul burned, "Let's talk, when will it be better."
"This Monday." Xu Qiu answered truthfully.
"Just the day before yesterday, um..." Chen Wanqing thought for a while before suddenly said:
"I understand. Before, the three of us acted together. Yesterday was the first time you two acted alone. In the end, Tian Qing broke through. If I knew this, I should walk back to Handan earlier."
Xu Qiu didn't answer, and Han Jiaying weakly interjected, "Well, senior sister, can you keep it secret for us, I don't want to spread it."
"No problem," Chen Wanqing vowed: "I will keep it secret for you."
"Hmm, let's go back first."
"alright, bye."
Waving goodbye to Xu Qiu and Han Jiaying, Chen Wanqing looked at the back of the two holding hands and left, standing still, as if thinking of something, his cheeks flushed slightly.
For a long time, she whispered to herself: "I have more than a year to graduate. Whether I am studying for a Ph.D or looking for a job, I will never stay in school anymore. After all, she and him are more suitable."
Xu Qiu and Han Jiaying only started to communicate after walking a long way.
"Today I was so busy debugging the TRPL instrument, and I forgot that you came back together." Xu Qiu said annoyed.
"It's okay," Han Jiaying said softly, then tilted her head, "Well...you said the senior sister won't betray us."
"Looking at her, it shouldn't be." Xu Qiu was also a little uncertain.
Talking all the way back to the southern campus, the two walked to a dim corner with no one around, and then stopped at the same time.
The smell of hormones is in the air...
...
Back in the bedroom, Xu Qiu thought about it, and decided to go to Zhangjiang for synthesis tomorrow, whether the system at hand started by himself, or he had to complete it himself.
Based on the further optimization of the two structures of PDI3-B-56, the optimization path has been reported to Mr. Wei before. There are several methods such as fused cyclization, Bay site modification, N-site side chain engineering, and introduction of heteroatoms.
Although the structures of the two molecules are slightly different, they can be regarded as the same system in general, so he plans to use these two to make an improvement.
The best result is that both improvements have positive effects, that is, both can improve the optical and electrical properties of the material. Then, in the next step, the two improvements can be integrated into the same molecular structure, and there is a high probability that higher performance improvements can be obtained.
However, there is a more embarrassing problem, that is, the raw materials are somewhat insufficient. The yield of the two 3D-PDI molecules obtained before is less than 100 mg, which is 15 mg in the Handan campus.
The remaining dozens of milligrams of materials are directly reacted. It is estimated that the product yield is only 40 milligrams, up to 50 milligrams, which cannot support further optimization and can only be synthesized from scratch.
Early the next morning.
Xu Qiu and Han Jiaying made an appointment for morning exercise. After eating early, the two went to Zhangjiang ahead of schedule, mainly to stagger Chen Wanqing and allow them to spend a little more time together.
On the school bus, the two chatted for a while. Xu Qiu remembered that they had not exchanged information about the experiment in the past few days, so he asked: "How is the synthesis done recently?"
"Well... it's okay. The synthesis of PDI-8 and the bromine substitution reaction of several PDI molecules are very smooth. I am mainly busy with this these few days, but..." Han Jiaying said:
"The second step of the reaction of the 3D-PDI molecule I did, that is, the reaction of connecting boric acid esters on the thiophene ring, produced products, but the yield was extremely low, only less than 20%. I am not sure if it is me. The product needed, I plan to try again next week."
Afterwards, she smiled sweetly, "Anyway, your system has got preliminary results. You can give priority to your system this week."
"Okay," Xu Qiu nodded, and then fell into thinking, "The reaction yield is low, let me think about whether there is any solution." During this time, he took the time to write a literature review, read a lot of literature, and many experiments. The details are still in my mind.
After a while, Xu Qiu sorted out his thoughts and slowly said:
In general, methods such as extending the reaction time, increasing the reaction temperature, or changing the reaction solvent or catalyst, and increasing the dosage of a certain component by a large amount, can be used, except These, there is another path..."
"What path?" Han Jiaying asked curiously.
"Using the microwave reaction method," Xu Qiu explained: "We originally planned to use it when we were making polymers, but at that time there were not many syntheses, and the priority was not high. Then it stopped, but now it is different. , The synthesis of small molecules requires many steps. If there is a microwave reactor, it will definitely bring a lot of convenience."
"Oh, microwave reactor," Han Jiaying thoughtfully, "I think there are many research groups in the literature that can greatly shorten the reaction time, but the price does not seem to be very cheap."
Xu Qiu said, "Imported about 100,000. The domestically produced one is not clear. It is estimated that it will cost tens of thousands. However, we can also make one ourselves."
"Make one yourself?" Han Jiaying tilted her head and thought, "You mean microwave..."
"Yes, it can be modified with a microwave oven. After all, the essential principle of a microwave reactor is almost the same as that of a microwave oven, but the safety and effectiveness are difficult to guarantee. Forget it..." Xu Qiu shook his head and said:
"I will find time to mention it to Teacher Wei, that is, I just bought a TRPL in the team, and I don't know if the funds are enough. I feel that since I joined the team, Teacher Wei has paid me no less."
"Anyway, the funds are spent everywhere, and there are results when used for the brothers. Teacher Wei must be happy and it is too late." Han Jiaying chuckled.
...
Zhangjiang Microelectronics Building.
Xu Qiu used the key to open the door of the office. Sure enough, the senior sister hadn't come yet.
As usual, start the preparatory work before the experiment, calculate the feeding ratio, and write it on the sticky note.
It's just that the two people are in the same room, no one is disturbed, and they are blessed with DEBUFF that reduces work efficiency by 30-100%.
After half an hour.
Chen Wanqing walked to the door of A501, subconsciously preparing to take out the key to open the door, but found that the light inside was on and the sound of speech could be heard.
She listened carefully and suddenly looked strange.
After knocking on the door three times, the sound of tables and stools rubbing the floor came from inside, and he waited a few seconds to calm down.
She turned the doorknob and pushed in.
"Senior sister early~"
"Senior sister early."
Looking at the pair holding hands at the desk, Chen Wanqing sighed lightly, "Hey, in the morning, you are going to hold me to death."
He threw his schoolbag on the sofa, took out the laptop, and said, "By the way, Xu Qiu, you just came here. Let's discuss the optimization path after the C1 system."
"Okay." Xu Qiu naturally did not refuse. This was promised by the senior sister before. Even if she didn't mention it, he would find the opportunity to take the initiative.
Chen Wanqing started the computer, opened the PPT file of the "synthesis route" on the desktop with the touchpad, and said: "Based on C1, I designed three molecules, C2, C3, and C4, which correspond to different molecular structure optimization directions. Among them:
C2 is the optimization of the side chain on the D unit. For example, the side chain of the benzene ring is replaced with a thiophene side chain. For example, by changing the number and position of the side chain, it can be further split into molecules such as C2-1 and C2-2;
C3 is the adjustment of the conjugate scale of the main chain of the D unit, including increasing or decreasing the number of conjugated fused rings, which can also be further split;
C4 is an improvement based on the A unit. The A unit commonly used in traditional ADA molecules is'rhodanine' and its derivatives, a five-membered heterocyclic ring containing nitrogen and sulfur atoms, and a carbon-oxygen double bond and a carbon-sulfur double bond. For this type of electron withdrawing group, my idea is to design a new A unit based on a six-membered ring. This is why I have so many synthetic reaction steps. "
After the introduction, Chen Wanqing tilted her head: "Student, what are your opinions."
Xu Qiu discovered that the synthesis route of Senior Sister now is much more complete than when she first discussed it after taking the leave. Obviously, she has been perfecting her thinking over time and is not standing still.
After thinking about it for a while, Xu Qiu had many ideas in his mind. He pondered it for a while before speaking slowly:
"C2 and C3 paths, many people currently research ~ EbookFREE.me~ There are a large number of ready-made structures that can be used. Since the seniors are going for a big article, it is better to focus on the C4 path, there is no need to do everything. Well.
Based on the C4 path, I think it is not necessary to entangle a five-membered ring or a six-membered ring, whether it is a five-membered ring or a six-membered ring, or even make a five-membered ring and a six-membered ring together. Yes.
For unit A, the focus is still on the electron withdrawing group. You can try to introduce strong electron withdrawing groups such as cyano, nitro and fluorine atoms.
However, relatively speaking, the priority of the nitro group is relatively low. This group seems to be incompatible with organic photovoltaic materials. At least I have not seen any donor or acceptor with a nitro group in the molecular structure.
As for the cyano group and fluorine atom, in terms of the difficulty and danger of the experiment, the priority of the cyano group is higher. "
"Cyano?" Chen Wanqing muttered thoughtfully: "It sounds so dangerous..."
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