PDF-Single-Crystal Structure of a Covalent Organic Framework

August312013October212013 Scheme1SynthesisofCOF320andItsMolecular pubsacsorgJACS. . Ionic (Atomic) Radii & Coordination Number (CN). Ionic radius: . Hypothetical radius (size) of an ion (. cation. or anion). Calculated values from the bonding distances. CN. Number of one kind of the bond forming ions (atoms) surrounding the other, which are forming the first direct bonding. 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.. 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.. 2. Emulsified Solution. Tso-Fu . Mark Chang. 1,2,*. , Wei-. Hao. Lin. 1,3. , Chun-Yi Chen . 1,2. , . Yung-Jung . Hsu. 3. , . Masato Sone. 1,2. 1. Institute . of Innovative Research, Tokyo Institute of . 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.. How do single crystals differ from polycrystalline samples?. Atomic . arrays that are periodic in three dimensions, with repeated distances are called single crystals. . Single crystal specimens maintain translational symmetry over macroscopic distances (crystal dimensions are typically 0.1 mm – 10 cm).. But, many of the common ‘inorganic’ materials are . ‘usually. *. ’. crystalline:. ◘ . Metals:. Cu, Zn, Fe, Cu-Zn alloys. ◘ . Semiconductors:. Si, Ge, GaAs . ◘ . Ceramics: . Alumina (Al. 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.. Covalent bonds . result from the . sharing . of electrons. between two atoms.. A covalent bond is a . two-electron bond . in which the bonding atoms share valence electrons.. A . molecule . is a discrete group of atoms held together by covalent bonds.. Carbon & The Molecular Diversity of Life Carbon: The Backbone of Life Living organisms consist mostly of carbon-based compounds Carbon is unparalleled in its ability to form large, complex, and diverse molecules Franz Ritter, Cornelius Krellner (Goethe-Universität Frankfurt). Achievements. Transregional Collaborative Research Centre SFB/TR 49. Frankfurt / Kaiserslautern / Mainz. B2. Introduction. Project goals and work program. Identification of Grand Challenges. Leadership and Industrial Representation. Chair: . Howard Katz, Johns Hopkins University. Speakers (Industry): . Greg Whiting, PARC (industrial . cochair. ); Darin Laird, . Atomic . arrays that are periodic in three dimensions, with repeated distances are called single crystals. . Single crystal specimens maintain translational symmetry over macroscopic distances (crystal dimensions are typically 0.1 mm – 10 cm).. Chem. 1. Introduction to organic structure & bonding. 1.1: Drawing organic structures. A. Formal charge. B. Common bonding patterns. C. Using ‘line structure’ (aka line-bond) convention. D. Constitutional (aka structural) isomers.