Chapter 201: What do you want two of you

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In Zhang Jiang’s laboratory, Han Jiaying stood by the metal medicine cabinet,
Brother, the solvent we used for the reaction is imidazole, right? Where is it, why can’t I find it?

Xu Qiu was preparing the glass instrument for the experiment. He recalled it and said: "Before the holiday, I seemed to put it on the left side of the second floor of the reagent cabinet."
"But isn't the second layer a solid reagent, imidazole is a solvent, should it be liquid?" Han Jiaying wondered.
"Solid medicines can also be used as solvents. If you remember correctly, imidazole should come in a 100-gram small box in the packaging of Sinopharm." Xu Qiu said that this medicine was previously ordered by him, so he still has some impression.
"Um... I'll look for it," Han Jiaying continued to search, while muttering: "Imidazole, Imidazole, I found it. It's really solid. The melting point is 89-91 degrees Celsius."
"Just find it," Xu Qiu explained: "Although imidazole is solid at room temperature, it can become liquid as long as it is heated to melt it. It can be used as a solvent. The reaction temperature is set to 120 degrees Celsius for this reason. "Although the task of summarizing the experiment was handed over to the school girl, the preparation work that should be done did not fall.
Then, Xu Qiu solemnly said: "Before the experiment, if it involves unfamiliar reagents, you must go to MSDS to check the basic physical properties, such as whether it is toxic, melting point, boiling point, etc., and whether there are other hazards, such as explosiveness and strong oxidation. , Strong corrosiveness, etc., even if it saves trouble, check Qiandu Encyclopedia. For example, imidazole is toxic, but it cannot be volatile. As long as it is not swallowed, it will be fine."
"Yeah, I know." Han Jiaying nodded like a chicken pecking at rice.
After the two put the glass instruments and medicines in place, they started the experiment.
The raw materials are perylene tetracarboxylic dianhydride and various amines, and the solvent is imidazole, which are relatively low-cost chemical raw materials.
For example, perylene tetracarboxylic dianhydride, 25 grams only cost more than 100, Xu Qiu directly bought two bottles at once.
After calibrating the balance, he carefully weighed the red solid powdered perylene tetracarboxylic dianhydride, while spitting out: "This time you can throw 5 grams of raw materials for each reaction, and finally you don’t need to search like the polymerization reaction before. Search, only one or two hundred milligrams of reactants are injected each time."
"Yes," Han Jiaying was operating in front of another balance, "and I think the reaction yield is quite high, about 90%, it should be a long time for one synthesis."
"If it is used directly, it can be used for a long time, and it can even be used for graduation. After all, we only need about 10 milligrams for a device preparation solution." Xu Qiu smiled:
"But if you continue to synthesize as a raw material, it is not necessarily true. Even if the yield is 90% each time, the total yield after the five-step reaction is only 60%, not to mention the yield of most steps. Maintain more than 90%, some may be less than 50%."
Han Jiaying gave a hum, and then said: "By the way, brother, we will do post-reaction processing afterwards, do we need liquid chromatography?"
"Of course, small-molecule materials are not enough to'pass the column', that is, the liquid chromatography step." Xu Qiu said.
"It's troublesome to say that in the synthetic chemistry experiment class, the most annoying experiment was to pass the column." Han Jiaying said.
Chen Wanqing inserted a sentence: "Our liquid chromatograph is quite advanced. Mr. Wei bought it for the PDI system at the time, and it cost more than 100,000 yuan. However, I didn’t use it a few times and it was a waste... "The more she talked, the smaller her voice became, apparently thinking of a piece of dark history before.
"One hundred thousand yuan? It's so expensive, it should be more automated." Xu Qiuchao glanced at the senior sister, her experiment progress was slightly slower, a beat slower than them.
"Yes, it's fully automatic. At that time, Teacher Wei bought it according to his preparation in the beautiful country laboratory," Chen Wanqing also walked to the balance and continued:
"After setting up the program, it will run on its own, but people can't leave during the process of passing the column, which is still very troublesome."
Xu Qiu nodded. He copied his senior sister's proficiency. The liquid chromatography was only 50% of the third order. He spent some points to upgrade to the fifth order of 0%.
Then he focused on two tasks, while continuing to do experiments, while watching the system images to learn how to operate this liquid chromatograph.
The reaction cast today is not as strict as the polymerization reaction before.
Just put the two raw materials and the solvent together, find a clean round bottom flask, heat and stir, and because the solvent imidazole has a high boiling point above 200 degrees Celsius, there is no need to set up a reflux device, so it is connected with a condenser and a circulation No water is needed.
In addition, this reaction has relatively loose requirements on the ratio of materials. It is not necessary to strictly observe 1:1, as long as the amine reagent is excessive, of course, it must also be excessive, otherwise there may be two main products in the final reaction, which are separated. It will be more troublesome.
After Xu Qiu weighed the two solid reagents, perylenetetracarboxylic dianhydride and imidazole, he took the two amine reagents, 3-aminopentane and 6-aminoundecane, to the fume hood.
The several amines they used are liquid at room temperature, volatile and toxic, so he chose to operate in a fume hood, use a syringe to measure the volume, estimate its mass, and directly add it to the reaction flask.
Since one molecule of perylenetetracarboxylic dianhydride can react with two molecules of amine, Xu Qiu sets the material ratio to 1:2.5 and the reaction time to 24 hours to make the two fully react.
Xu Qiu did not forget to remind the school girl: "Add amine reagents to the fume hood, and pull the fume hood door to the bottom to prevent leakage." After all, none of the three of them wear gas masks, which are protected by ordinary disposable activated carbon masks. Ability is relatively limited.
"Okay." Han Jiaying also learned to operate.
...
Soon, Xu Qiu cast two reactions. ‘I feel that the response time is very fast, that is, the reaction time is 24 hours. It would be nice if it could be accelerated in reality like in a simulation laboratory, but unfortunately it can’t. ’
After starting the heating and stirring function, as the temperature rises, you can see that the solid matter in the round-bottomed flask melts, glowing red, and it feels like something indescribable is being refined.
After a while, Han Jiaying's two reactions were also completed. She called out, "Brother, come and help me. My reaction is okay."
"How can this be seen by the naked eye?" Even though he said that, Xu Qiu walked over. The state of the school girl's reaction vessel was similar to his. "Take a test on you, what do you think is the core of this reaction?"
"Um..." Han Jiaying thought for a while, and then said: "Is it the material ratio?"
"Yes, as long as the amines are added in excess, this reaction will basically not cause any problems," Xu Qiu glanced at Chen Wanqing who was still doing experiments, and continued: "Let’s go, let’s clean up the laboratory, and then All the glass instruments in the caustic tank in the laboratory are cleaned."
"Okay," Han Jiaying nodded: "Then I'll go to organize the laboratory."
"Yeah." Xu Qiu walked to the sink. He placed the alkaline tank in the cabinet under the sink. He turned on the faucet first and then placed a basin under the water flow.
Then take out the alkali tank, carefully take out the various glass instruments soaked in it with long tweezers, pour out the lye inside, and then rinse it under the water flow, and finally transfer the various bottles and cans to ultrasonic cleaning In the instrument.
The next step is two rounds of detergent and one round of tap water. After rinsing, drain the water and put it in an oven to dry.
In this way, most of the glass instruments can be cleaned, and the few that are not clean are thrown back to the alkali tank and rebuilt with a brush. After another round, the ones that are really not clean are just discarded.
This cleaning process lasts for a long time, but it takes up the scattered time of the experiment, and it is not anxious, even if the cleaning is not finished in a day, it is not very important.
...
After handling today's experiment, the three returned to A501 to rest.
Xu Qiu had left his mobile phone in the office before, and there was a missed call at this time.
It was an unfamiliar number, but it was not marked as a harassing call, so he called it back and the call was quickly connected.
"Hello."
"Hello, I am Qiu Heming, the sales manager of HORIBA. Mr. Wei contacted me before and said that your research group is interested in buying a TRPL instrument. Let me contact you. Or let's add a WeChat to talk specifically. I can give Please send us the brochures and quotations of our company's products."
"Okay, I have the same number on WeChat and my mobile phone."
"Then I won't bother you much, bye."
"Bye."
Listening to the voice, Qiu Heming is a middle-aged uncle, who speaks in a hurry.
Not long after, Xu Qiu received Qiu Heming's WeChat verification message. The WeChat name was his real name.
After passing, the other party sent a few PDF files, Xu Qiu downloaded them, and then sat on the sofa, called the school sisters and the school sisters, and sat next to him to study together.
Seeing the picture of the instrument on the homepage, Han Jiaying said,
The TRPL instrument sent by Dr. Qiu looks much smaller than the one we used for testing at Sioux City University last time. I remember Mr. Kaihua Hou’s one is also from HORIBA. ."
"Well, maybe their unit is an early product, and now the technology is iterative." Xu Qiu paused: "This is not important, such an expensive instrument, they must debug it, and then after we test the data is normal, They will be paid, and if there is a problem with the instrument, they will not receive the money."
He flipped through the PDF file. The entire TRPL instrument is composed of three parts, a sample compartment, a detector, and a laser generator.
"The detector is fixed. We don't need to worry about this. There are two issues to consider now. One is the sample chamber and the other is the laser. Let's look at the sample chamber first." Xu Qiu said:
"My suggestion is to choose a larger one, such as this one with a side length of 60 cm, because it may involve light path modification, such as the installation of filters, light reduction mirrors, etc., if the larger is larger, the operating space will be larger. What do you think?"
Chen Wanqing quickly raised an objection: "There is not much space in our Handan laboratory. I just saw that the TRPL detector has three components, each of which is about 153040 cubic centimeters. If the sample compartment is also about 30 cm in length. You can also find a corner to place it vertically, but if the sample compartment is too large, it will most likely not fit, so you can’t buy it and put it in Zhang Jiang’s laboratory. That’s not convenient.

"This is a problem." Xu Qiu was lost in thought.
The smallest size in the manual is 45 cm in side length. The sample compartment of 30 cm square is not in the manual. It is a question of whether it can be done or not.
Do you want to use a 45 cm square?
But the 60 cm sample chamber is more pleasing to the eye.
But it is true that as the senior sister said, such a large instrument can't fit in the Handan Laboratory. There are two glove boxes and dozens of large and small instruments squeezed into a space of more than 20 square meters.
The available space on the vacant laboratory bench is only about 30 cm deep, mainly because most of the experiments are performed in a glove box, which is not as demanding as the synthesis laboratory on the laboratory bench.
what can we do about it?
Suddenly, Xu Qiu had an idea and said:
"I remember, there is a utility room in Teacher Wei's office. There seems to be an empty table. You said..."
"If you go to mention it, I will raise my hands and feet in favor of choosing a 60 cm sample chamber."
"It's the same for me."
"Hey, what's the use for the two of you? I'll go back later and talk to him." Xu Qiu sighed and continued:
"Then there is the problem of lasers~EbookFREE.me~ from more than 300 nanometers to more than 700 nanometers. I think we should buy two, one about 500 nanometers and one about 700 nanometers.
In this way, the light absorption range of most organic photovoltaic materials can be taken into account, and the light absorption range of perovskite materials is similar, and they can be used together. "
"I don't have any opinion on this." Chen Wanqing nodded and said: "Why don't you make a decision after looking at the quotation?"
"Okay," Xu Qiu saw that the school girl had no other comments, so he directly opened the quotation and said: "There is no problem with the wavelength difference of tens of nanometers. Try to choose the cheaper ones and save some money for the group."
The trio finally chose 465-nanometer and 695-nanometer lasers. The price of one is 70,000 and the other is 52,000. The price of the sample compartment and detector is fixed, which adds up to a little more than 70,000. Of course, the most valuable is the detector. , The sample compartment is just an iron bump.
Later, Xu Qiu sent the results of their discussion to Qiu Heming, and asked for some discounts.
In the end, the whole equipment added up to 180,000. Qiu Heming was very efficient. He made the quotation in less than half an hour, and now he is waiting for Teacher Wei to make a decision.
Chen Wanqing's response needs to be shut down at night. Xu Qiu and Han Jiaying don't use it. The three of them decided to stay in Zhangjiang, write a summary together, and take the last school bus back in the evening.
At about 5:30, Chen Wanqing received a call from Teacher Wei, mainly asking them about the experiment.
‘Maybe Handan suddenly lost three people, and Teacher Wei missed them a little? ’
Xu Qiu was speculating on Teacher Wei’s intentions of Cha Gang, and suddenly heard Chen Wanqing say,
About TRPL, Xu Qiu needs to report something.

Then he had an extra cell phone in his hand.
Looks confused.