PPT-Non-Covalent Pi-System Interactions

Elizabeth Bess University of Utah Noncovalent interactions with Pi systems Overview Noncovalent interactions are the underpinnings of chemical selectivity molecular recognition and supramolecular molecules tertiary structure eg enzymes and DNA These throughspace rather than throughbond interactions arise from attractions between oppositely and fully or partially charged species One such class of noncovalent interactions are the intermolecular interactions of pi systems with other pi systems or charged species . Paul Deitel, CEO. Deitel & Associates, Inc.. Contact Information. Paul Deitel, CEO. Deitel & Associates, Inc.. Twitter: @deitel/@. pdeitel. Facebook. : . http://tinyurl.com/deitelfacebook. deitel@deitel.com. Biology 10(B). Learning objectives. Identify . major systems in plants. Describe the interactions that occur among systems to carry out vital plant functions. Interactions Among Plant Systems. Organ systems:. Why do atoms bond?. Atoms gain stability when they share electrons and form covalent bonds.. Lower energy states make an atom more stable.. Gaining or losing electrons makes atoms more stable by forming ions with noble-gas electron configurations.. What is the arrangement of the electrons around each chlorine atom in Cl. 2. ?. 2, 8, 8. This is the same as the electron configuration of an atom of which noble gas?. Argon. When atoms bond . covalently. Chapter 9 ~ most compounds, including those in living organisms, are covalently bonded. What You’ll Learn. I will analyze the nature of a covalent bond. I will name covalently bonded groups of atoms. Transferases and hydrolases catalyze group transfer reactions. Acyl transfer:. Hexo. kinase. catalyzes a phosphoryl transfer from ATP to glucose. Glycosidases. are hydrolases, catalyzing hydrolysis of . Bonding. Bonding models for methane, CH. 4. . Models are NOT reality. Each has its own strengths and limitations.. Ga . Standards. Students know . atoms combine to form molecules by sharing electrons to form covalent or metallic bonds or by exchanging electrons to form ionic bonds.. Alexandra Kent & Allyson Brome. University of Utah. Non Covalent Interactions. Wiki Page. : . http. ://en.wikipedia.org/wiki/Non-. covalent_interactions. . Other References: . Anslyn. , E. V., Dougherty, D. A. (2006). Modern Physical Organic Chemistry. Sausalito, CA. University Science.. Defense from injury & illness. BIOL.10A . Describe the interactions that occur among systems that perform the . functions of . regulation, nutrient absorption, reproduction, and . defense from injury or illness . By: Andres F Sanchez. Molecular Orbital!. Molecular Orbital- . The space that shared electrons move in. Covalent Bond- . when two atoms share electrons. Energy and Stability. Most atoms have low stability except noble gases. Transferases and hydrolases catalyze group transfer reactions. Acyl transfer:. Hexo. kinase. catalyzes a phosphoryl transfer from ATP to glucose. Glycosidases. are hydrolases, catalyzing hydrolysis of . Mrs. Page. Essential Idea. Lewis (electron dot) structures show the electron domains in the valence shell and are used to predict molecular shape. .. Nature of Science. Scientists . use models as representatives of the real world – the development of the model of molecular shapes (VSEPR) to explain observable properties.. Covalent Bonds. Covalent bonds:. occur between two or more . nonmetals. ; electrons are . shared. not transferred (as in ionic bonds). The result of sharing electrons is that atoms attain a more stable electron configuration.. 6.2. Molecules. Molecules – a neutral group of atoms held together by . covalent. bonds. Molecular compound – a . cmpd. whose simplest units are molecules. Chemical formula – indicates relative # of atoms of each kind in a chemical compound by using atomic symbols & subscripts.