One-pot Synthesis of Porous Coordination Polymers

One-pot Synthesis of Porous Coordination Polymers Generally, the properties of crystals are strongly determined not only by their chemical composition, but also by their morphology, size and surface structure.1-3 Over the past decade, crystals with specific crystal facets have attracted great research interest because the exposed facets on the crystals finely affect the chemical and physical properties of the functional materials.4-6 For example, noble-metallic nanocrystals having high-index facets generally show much higher plasmonic and catalytic activity than that of nanocrystals with low-energy facets.7-9 Therefore, the design and synthesis of crystals with specific crystal facets is desired, but is still a challenge. Porous coordination polymers (PCPs) or metal-organic frameworks (MOFs), which are considered as a unique class of inorganic–organic hybrid materials with metal centers and organic linkers,10 have received growing attention in recent years because of their tailored pore structure, high surface area and many exceptional properties such as gas adsorption and storage,11,12 drug release,13,14 sensing,15,16 membranes,17,18 and catalysis.19,20 To date, many research efforts have been focused on the design, synthesis and applications of bulk MOFs materials; however, nanosized MOFs (NMOFs) materials have become increasingly interesting in the last decade because their microstructure, morphology and size also determine the properties and applications of NMOFs materials.21-22 Likewise, aspect ratio and exposed crystal facets of NMOFs crystals play an important role on the properties of materials such as sorption properties, and oriented film formation as well.23-25 Therefore, controllabl e synthesis of well-defined NMOF crystals with specific exposed crystal facets in the nano/micrometer range is highly desirable. However, it is still difficult to design a universal synthetic method to achieve above target due to the variety in MOFs structures and various experimental parameters affecting the crystal shape and size. To date, several synthetic strategies have been employed by research groups for the synthesis of NMOFs such as room-temperature precipitation,26-27 hydro/solvothermal techniques,22,28 microwave-assisted synthesis,29,30 sonochemical synthesis31,32 and electrochemical synthesis method.33 Among them, room-temperature precipitation, in which the solutions of metal salts and organic linkers are mixed, is the simplest system to produce NMOFs. Compared with other methods, solution-based precipitation syntheses at room temperature possess some advantages, such as safe reaction process, easily controllable reaction conditions, low energy consumption, and short reaction time. On the other hand, the use of various additives is an important synthesis approach for the fabrication of NMOFs materials with tunable morphology and size because the additives usually suppress nucleation and crystal growth during the reaction process. Monocarboxylic acids and their salts have been widely used as the addi tives or capping agents for the preparation of NMOFs which can alter the coordination equilibrium at the crystal surface during the nucleation and growth process.29,30,34 Kitagawa and coworkers have used the combination of the coordination-modulation method and microwave synthesis to control the size and morphology of HKUST-1 in which dodecanoic acid was employed as the coordiantion modulator.29,30 Huber and Fischer have yielded stable and size-selected MOF-5 colloids by adding p-perfluoroethylbenzoic acid as capping reagent.34 Besides, N-heterocycles and alkylamines also are used as additives in the synthesis of MOFs and ZIFs. Oh et al. reported that pyridine was added in the solvothermal synthesis of In-MIL-53 to manipulate the morphology of the microsized crystals.35 Huber and Wiebcke reported a rapid room-temperature production of ZIF-8 crystals with different sizes by employing an excess of auxiliary ligands such as 1-methylimidazole and n-Butylamine.36 Another kind of additive s including surfactants and polymers also has been used to control morphology and size of NMOFs which could suppress the growth of specific crystal facets. Our previously reported HKUST-1 nanocrystals with controllable size and morphology from nanocube to microoctahedron have been readily synthesized at room temperature by adjusting the concentration of CTAB (CTAB = cetyltrimethylammonium bromide).26 Zeng and Eddaoudi reported highly monodisperse M(III)-soc-MOFs with a morphological evolution from simple cubes to complex octadecahedra have been achieved using a series of surfactants and structure-directing agents.37 Porous coordination polymer [Cu2(PZDC)2(PYZ)] crystals (PZDC = pyrazine-2,3-dicarboxylate, PYZ = pyrazine) with tunable size were prepared in a predictable manner via addition of organic polymer Poly(vinylsulfonic acid, sodium salt) by Kitagawas group.38 However, to the best of our knowledge, the study on other types of additives such as acids or bases allowing control t he morphology of NMOFs, especially inducing the crystal morphological evolution of polyhedron, has not been realized so far. Although the role of the pH of the reaction medium, which is to deprotonate the ligands, accelerate nucleation rate and consequently cause smaller size of particles has been studied systematically,39 the detailed studies on the morphological evolution of crystal induced by acid−base environment of the reaction medium are scarce. Herein in this work, we develop a simple and straightforward method for the one-pot synthesis of porous coordination polymers with controllable shape by using different bases (sodium acetate, aqueous ammonia, triethylamine and NaOH) as deprotonation reagents in the ethanol-water mixture at room temperature. We specifically selected porous coordination polymer MOF-14 ([Cu3(BTB)2], H3BTB = 4,4,4-benzene-1,3,5-triyl-tribenzoic acid) as candidate material for the investigations which possesses a dicopper paddle wheel secondary building unit that exhibits unsaturated metal centers upon activation and has received great attention due to its high porosity and large specific surface areas.40 Its benzenetribenzoate-based analogue HKUST-1 ([Cu3(BTC)2], H3BTC = 1,3,5-benzenetricarbocylic acid) also was studied. In this paper, a morphological evolution of MOF-14 from rhombic dodecahedron to truncated rhombic dodecahedron, cube with truncated edges and to cube was achieved by increasing the conce ntration of sodium acetate, likewise, a morphological transformation of HKUST-1 from octahedron to cuboctahedron and finally to cube was obtained in the similar process. We further investigated the proposed crystal formation mechanism and found that the higher-energy surface of crystals would appear when more amount of bases were added, indicating that the exposed surface facets of porous coordination polymers could be controlled by acid−base environment of the reaction medium. The gas adsorption properties of MOF-14 with different shapes were also studied and it reveal that properties of MOF-14 display a strong dependence on the facets exposed on the surface.

Our Daily Life Essay

I have encountered so many things in life; all of them seem to be related to me. In this reflection that you’ll see is all my experience in life that is changing every day. I know I’m not a perfect person but I will share this to you (all readers) to reflect it, not just me or the person beside you. I have this persons in my mind that I want to share, first of is my cousin in my father side; his name is Nunoy â€Å"Nuno† Lapasaran. He has this kind of sickness that he will bring to himself to the future, he is a Special Child. Every day I’m at his house also my father’s house, all day I’m always playing with my other cousin. I recognized his movements every time I go there, he always wearing girl’s clothes for short he is a she. He always flirts on every guy that passes by, even our cousins there. He can also fight other if he’s in danger. This is my observation to his condition; although he is got that sickness, he adopts slowly, it is good news for us. And we are family we protect each other wherever you are, whatever you are and we never broke our bonds to each other. My next subject but the same topic is also my cousin in my mother’s side; his name is Joriz Rosimo. This little guy is really hard to play with because he always pounding us with his fist and always spitting like an ordinary special child will do. To tell you the truth I got carried away with emotion and I just spank his butt, of course he cried out loud and my Tita heard it, and I got rebuked by my Tita and my mother about what I did. For that I just endure all the punches that he will throw at me. I learned many things from it and got to used it in my life right now. To endure all the big problems that will come at me and solved it with my family. I’m not alone in this life, there my family caring, loving us every day. And this is my last reflection to myself. I realize that Every Child is Special, just love them don’t hate them, care for them not to abuse their sickness, teach them, learn from them. I hope that I delivered this reflection very well and to God be the Glory.

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You need talent, luck, and persistence. Pick any two if you want to be successful. Whether you are a basketball coach or player, you can reach your (realistic) goals and achieve a high level of success with Just two of those three. Don't believe me? Let's take a look†¦ Talent To some degree, what most people refer to as talent, Is nothing more than passion. If you love to do something†¦ you will do it every chance you can. And the more you do it, the better you get.Now obviously there are several uncontrollable factors that determine someone's ultimate talent and success on the basketball court (height, athleticism, etc. ), but in many instances, talent comes from non-stop, obsessive practice. I have never met a lethal shooter who didn't practice all of the time†¦ who dldnt shoot thousands and thousands of shots every single week. Being a talented shooter is 100% controllable. There is no debate that Kevin Durant was born with numerous physical gifts. But so are a lot of people.So how come KD Is an NBA All-Star and 3-tlme NBA leading scorer nd other 69†³ guys never get chance to play past college? Because KD has an unparalleled passion for basketball and he works on his craft every single day. The same can be said for Grelvls Vasquez of the New Orleans Hornets. I met Grelvls the day he got to the united States (from Venezuela) in 2005. He spoke very little English and weighed 150 lbs. Now he plays in the NBA. How is that possible? He made himself talented by working on his game every single day. Same goes for coaching.Who are some of the most talented coaches in college basketball? Coach K? Tom Izzo? Do you have any idea how much time and effort those guys have put into their coaching skill sets? They love the game of basketball and work relentlessly at becoming the best they can be. Talent is the ability to make the most of what you have with where you are. Luck Honestly, I don't believe in luck. I think unsuccessful people use luck as an e xcuse I believe luck is when preparation meets opportunity. I love the quote, â€Å"the harder you work, the luckier you get. There is so much truth to that statement. So that means, in rder to be lucky, you need to be well prepared when opportunity knocks. Do you even know how to prepare? Players, what do your daily workouts consist of? Do you Just Jack up 300 shots or do you take game shots, from game spots, at game speeds? Do you practice ball handling drills looking down at the ball or do you force yourself to look up (even though you may lose the ball initially)? Do you visualize a defender in front of you when making moves to the basket or do you Just do the drill?Do you have a solid strength & conditioning foundation or do you Just play pick-up? Equally important, are you a great teammate? Are you the type of player other players like to play with and coaches like to coach? Trust me†¦ you'll be a lot luckier if you are! Coaches, do you Just study the X's and O's or do y ou work on communication and leadership? Do you put all of your focus on your out-of-bounds plays or do you spend time learning how to most effectively communicate wltn every memoer 0T your program? Do you relnTorce great work habits with your players 365 days a year?Do you read, watch film, and network with other coaches? I realize many resources cost money†¦ camps, clinics, DVDs, and trainers, which can me a limiting factor for some. However there are numerous resources that don't (like this blog or my YouTube channel). Find them. Use them. If you want to be lucky, you need â€Å"to be in the right place at the right time. † Instead of waiting for that to happen, you need to make an effort to create real value in every place you go and every person you come in contact with. When opportunity knocks, will you be prepared to answer?Persistence This one is pretty obvious. Don't give up on anything you cant go a day without thinking about it. Never quit. Keep practicing. Ke ep working. Most people think they are persistent, but in reality, they give up after a couple of â€Å"no's† or a few minor failures. Be too stubborn to quit. Don't be so pigheaded you won't try to new approaches or make adjustments along the way†¦ Just don't quit. Ever. My twin sons, Luke ; Jack, are 2 h years old. They have an unyielding persistence. They don't stop until they get what they want! They are relentless and they don't take no for answer.While that has certainly caused me some grey hairs, I hope it is a quality they never out grow. If they apply the same persistence to the game of basketball as they do to wanting to be fed†¦ they will indeed be McDonalds All-Americans in 2028! Bottom line is this. If you want to be successful, on the court, or in anything in life.

exam Essay - 671 Words

Grammar assignment 1 A 1) Does she really knows how to make an authentic Victoria sponge cake? Does she really know how to make an authentic Victoria sponge cake? √ Uregelmà ¦ssigt udsagnsord. 2) Through practice Galileo became good to observe the stars and was able to identify craters on the moon. Through practice Galileo became good to observe the stars and were able to identify craters on the moon. 3. person ental. 3) The long-term consequences of sleeping too little is still unclear. The long-term consequences of sleeping too little are still unclear. √ Da ordet â€Å"consequences† er i flertal sà ¥ derfor skal ordet †is† laves om til †are† √ 4) I definitely agree with you that she sang beautiful at the concert last†¦show more content†¦Whose er †ejefald† og bruges om bà ¥de personer og ting Whom bruges efter prà ¦positioner og nà ¥r det fà ¸rer tilbage til objektet i sà ¦tningen C Tekst 1: Det er meget svà ¦r at forstà ¥, da uddraget for romanen er for à ¥r 1841 og at der bliver anvendt ord som †inexorably† og †notch†. Selve romanen er ikke til alle à ¥rgange, man skal virkelig và ¦re god til engelsk for, at forstà ¥ den, da sprog niveauet er rigtig hà ¸jt. Ikke nok med det skal man kunne là ¦se mellem linjerne, da der er et budskab. I uddraget bliver der brugt lange sà ¦tninger som ogsà ¥ gà ¸r det kompliceret at forstà ¥. Hvor ser vi de lange sà ¦tninger hen? Husk at và ¦re konkret. Hvor er billedsproget? Hvorfor skal man là ¦se mellem linjerne? Tekst 2: Det er let at forstà ¥, da uddraget fra romanen er for à ¥r 2006 og meget let là ¦seligt, da der ikke rigtigt er nogle svà ¦re ord. Romanen er til alle som kan forstà ¥ og là ¦se engelsk, da der ikke er gemt noget mellem linjerne. I uddraget bliver der anvendt korte sà ¦tninger og det gà ¸r den nemlig lettere for là ¦seren at forstà ¥. Và ¦r konkret. Hvad med grammatikken? D Oscar Pistorius was born in Johannesburg in 1986. As a child, both his legs were amputated below the knees, but his mother encouraged him to train his body in spite of its disability. However, it was not until 2004, he began to run, and by combining new technology and physical strength managed Pistorius word order to compete in the Olympics 2012. Although apartheid is/has been abolished, isShow MoreRelatedCareer Preparation Essay3593 Words   |  15 Pageswhether my actually want to attend business school. It also give me a better perspective on what I want to get out of business school. 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