Chapter 216: Yes, I did it on purpose

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"Yes, I thought you would find the clues in the morning, but I didn't expect to find out now," Xu Qiu sighed deliberately, "Hey—"
"Wow." Han Jiaying rushed over with her teeth and claws.
Xu Qiu didn't expect her to be so fierce, she was shocked immediately, and took a step back subconsciously.
Han Jiaying was empty.
Seeing that the school girl was about to fall, he had to meet him again.
Then, the two hugged each other.
The atmosphere in the room instantly turned pink.
The two of them stared at each other with big eyes, but they didn't mean to let go of each other.
At this time, the door of A501's room was suddenly pushed open.
Tian Qingfeng rushed in, "I'm here."
Xu Qiu and Han Jiaying separated quickly.
Tian Qing scanned the two of them and said suspiciously: "What were you two doing just now?"
Xu Qiu gave a light cough and calmly said: "We are discussing the experiment." Han Jiaying next to her nodded very cooperatively.
"By the way, Senior Sister Tian Qing, why are you here? Do you want to synthesize perovskite quantum dots?" Xu Qiu changed the subject.
Tian Qing probably guessed something, but when they saw that they were reluctant to say it, she didn't go after them, and replied, "Yes, I sorted out the literature some time ago, and today I plan to use the literature to synthesize a standard sample."
Later, she explained: "I originally planned to take the school bus with you, but when I returned to the laboratory, I learned that you had just left and then I didn't see you at the school bus spot."
"Well, we took a 1:10 car. Sister Tian Qing took a 1:30 car." Xu Qiu recalled. Now the school bus schedule has increased a lot after school starts. Noon is the peak period, and the average is 20 minutes. At half an hour, the next one is exactly half past one.
"Yes," Tian Qing nodded, "By the way, after Zhang Jiang's laboratory was renovated, it was my first time here. When I came here, it was still an empty shell. I haven't used the chemistry laboratory for a long time. Before coming, Chen Wanqing entrusted me to you, and said that you can ask you any questions."
"Easy to say, easy to say." Xu Qiu agreed.
The three chatted for a while, and then entered the laboratory together.
When Tian Qing came for the first time, she temporarily borrowed Chen Wanqing's lab coat and put it on without using the lab coat. The two of them had little difference in body shape.
Xu Qiu first introduced Tian Qing to laboratory safety issues, such as wearing three-layer gloves and disposable activated carbon masks. You can't touch them casually. There are toxic substances everywhere. She has a professional academic background and can adapt to it. Not difficult.
Then he went to the school girl to check her progress. Her first reaction was the Stille coupling reaction, and she asked to test the purity of the sample before the reaction.
After the two settled down, Xu Qiu started his own experiment.
The reaction is a Suzuki coupling reaction, and the raw materials are PDI-Br and 1,3,5 triborate benzene.
Four kinds of PDI molecules were synthesized before, with four kinds of monobromine substitutions.
Xu Qiu made a selection and decided to use PDI-5 and PDI-6 with longer side chains.
This is based on the previous experience in the synthesis of dimers, in which the side chain length is better.
The 3D-PDI to be synthesized now is equivalent to trimerization and tetramerization to some extent, and the molecular structure is larger, and the requirement for the length of the alkyl side chain should theoretically be longer.
Later, if necessary, PDI-8 with a longer side chain can be developed, or the side chain of the PDI molecule can be modified.
Xu Qiu took out the PDI-5 and PDI-6 reagent bottles, which were marked with the remaining amount, about 120 and 180 mg respectively.
After thinking about it, he decided to use 120 mg and 90 mg respectively, leaving 90 mg of PDI-6 for the school girl.
Start the experiment.
Re-evaporate the reaction solvent, this time using tetrahydrofuran THF, and doing the Suzuki coupling reaction for the first time, Xu Qiu directly followed the conditions in the literature.
Prepare a clean two-necked flask, stir bar, condenser, nitrogen ball, and set up experimental equipment.
Weigh the raw materials, and dissolve the raw materials with THF after re-steaming.
Prepare an aqueous solution of sodium carbonate and add it to the reaction flask. This reaction needs to be carried out under weakly alkaline conditions.
Theoretically, pure THF and water are mutually soluble, but due to the existence of sodium carbonate inorganic salt, they cannot be completely mutually soluble, and will separate into water phase and THF phase.
Therefore, he added a few more drops of phase transfer catalyst.
Use a nitrogen ball to pump three rows to ensure the nitrogen atmosphere in the reaction vessel.
Finally, add the catalyst tetra(triphenylphosphine) palladium, and again use a nitrogen balloon to pump three rows, quickly increase the temperature, turn on the condensed water, and cover the outer surface of the reaction vessel with aluminum foil.
Cast two reactions in turn.
Because it took some time to instruct Tian Qing to get acquainted with the chemistry laboratory today, he was the only one left after Xu Qiu finished the reaction laboratory. The school girl and Tian Qing had already walked back to the office.
He checked the laboratory and found that Han Jiaying and Tian Qing's reactions were proceeding normally, so they took off the lab coat and walked to A501. Tian Qing's laughter could be heard across the door.
He opened the doorknob with his small arm and walked straight to the sink.
In the office, Han Jiaying and Tian Qing were talking and laughing. When Xu Qiu came in, the two of them just paused ~EbookFREE.me~ and then continued to talk about some women's topics.
The two little rich women share a lot of topics.
Xu Qiu was also slightly surprised. It was rare that the two of them had such a high conversation before.
But after another thought, it might be because Han Jiaying was taken by him for a long time, and he didn't usually communicate much with Tian Qing.
People who are half-year-old are usually easier to talk about, and the more familiar people are, the less topical they sometimes become.
After washing his hands, Xu Qiu shook his hands by the pool, returned to his seat, sat down, turned on the computer, and was preparing to write a summary with codewords. Suddenly, he thought of the email sent by the counselor Yu Qiang a few days ago and notified several things. Select the graduation project topic, write the opening report, and have a class meeting on Tuesday.
He has selected the topic of the graduation project, which is the one submitted to Teacher Wei before, but the opening report has not been written yet.
"Sister Tian Qing, are you still in the opening report when you graduated, send me a copy."
"Okay, give me a USB flash drive, and I will give you the entire copy."
A few minutes later, Xu Qiu retrieved the U disk and plugged it into the computer. There was only one folder "Graduation Design" in it. After clicking on it, there were dozens of files, including the opening report, interim report, graduation design and so on.
With reference to Tian Qing's template, the content corresponding to the opening report is just the preface of the article, which mainly includes the current development status, problems facing and a feasible research direction.
Xu Qiu copied and pasted from the previous fund annual summary report, and then revised it. It took more than ten minutes to complete his opening report.
In the afternoon, after Tian Qing finished the reaction and got the product, she left in a rush.
Only Xu Qiu and Han Jiaying remained in the laboratory, and both of them did not mention what happened at noon, and the post-reaction process they carried out together.