COPY: Supramolecular Chemistry Chapter 14
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Questions and Answers

Who first introduced the concept and term 'supramolecular chemistry'?

  • A. W. G. Cairns-Smith
  • J.M. Lehn (correct)
  • L. Pauling
  • R. Hoffmann
  • Which of the following interactions is not typically considered an intermolecular force in supramolecular chemistry?

  • Hydrogen bonding
  • Van der Waals interactions
  • Covalent bonding (correct)
  • π-π stacking interactions
  • What is a key characteristic of supramolecular species compared to molecules?

  • More flexible dynamics (correct)
  • Higher melting points
  • Stronger bonds
  • Highly localized electrons
  • Which of the following best describes the idea behind supramolecular chemistry according to Lehn?

    <p>Chemistry beyond the molecule</p> Signup and view all the answers

    Which intermolecular force involves π-π stacking interactions?

    <p>Van der Waals interactions</p> Signup and view all the answers

    Which of the following is a true statement about intermolecular forces in supramolecular chemistry?

    <p>They provide supramolecular species with dynamic flexibility</p> Signup and view all the answers

    Which interaction has the highest bond energy?

    <p>Triple bond</p> Signup and view all the answers

    What is a characteristic of molecular recognition?

    <p>Host binding sites attract different parts of the guest molecule</p> Signup and view all the answers

    Which category of molecular receptors is responsible for binding cations via electrostatic ion-dipole interactions?

    <p>Cation binding hosts</p> Signup and view all the answers

    Which substance incorporates softer atoms like N, S, P to bind strongly with transition metal ions?

    <p>Heterocrowns</p> Signup and view all the answers

    Which type of host is specifically designed to remove Li+?

    <p>Spherands</p> Signup and view all the answers

    Which molecule shows greater selectivity for K+ among alkali and alkaline-earth cations?

    <p>Cryptands</p> Signup and view all the answers

    What advantage do lariat ethers have over crown ethers?

    <p>Ability to transport cations across lipophilic membranes</p> Signup and view all the answers

    Which interaction type has the weakest bond energy?

    <p>Dispersion forces</p> Signup and view all the answers

    What affects the selectivity of cation binding?

    <p>Cation binding kinetics</p> Signup and view all the answers

    What is a characteristic feature of cyclodextrins?

    <p>Hydrophilic due to -OH groups in the faces</p> Signup and view all the answers

    Which of these is not a factor affecting cation binding?

    <p>Host molecule size</p> Signup and view all the answers

    What type of interaction is observed in calixarenes?

    <p>π-cation interaction</p> Signup and view all the answers

    Which host molecules are used for anion recognition?

    <p>Polycyclic amide ligands</p> Signup and view all the answers

    Which type of host molecules are cavitands?

    <p>Molecules with an intrinsic cavity present in both solid-state and solution</p> Signup and view all the answers

    Which of the following is an example of a macrocyclic polyamide anion receptor?

    <p>Positively charged hosts binding to [PdCl4]2-</p> Signup and view all the answers

    Why are anions generally large, and what does this imply for their receptors?

    <p>Anions are large, so their receptors need to be large as well</p> Signup and view all the answers

    What term is used for components that undergo self-assembly?

    <p>Tectons</p> Signup and view all the answers

    Which type of self-assembly is characterized by dynamic and reversible interactions?

    <p>Supramolecular self-assembly</p> Signup and view all the answers

    Who introduced the concept of metallosupramolecular chemistry?

    <p>E.C. Constable</p> Signup and view all the answers

    In the context of metallosupramolecular chemistry, what do metal ions provide?

    <p>Set of coordination geometries</p> Signup and view all the answers

    What type of helicates was introduced by Lehn in 1987?

    <p>Cyclic</p> Signup and view all the answers

    What is the structural characteristic of a rotaxane?

    <p>A stoppered filamentous molecule threaded through a cyclic one</p> Signup and view all the answers

    Which type of coordination geometry is not associated with double stranded helicates?

    <p>Triclinic</p> Signup and view all the answers

    Who introduced the concept of catenanes, and what do they involve?

    <p>Sauvage; Interlocking of two cyclic structures</p> Signup and view all the answers

    What common attributes are shared by components in molecular devices?

    <p>They are photochemically, redox, or chemically active molecules</p> Signup and view all the answers

    What is the coordination number (CN) and shape for Cu(I)?

    <p>CN = 4, tetrahedral</p> Signup and view all the answers

    Which year was the Nobel Prize in Chemistry awarded for the design and synthesis of molecular machines?

    <p>2016</p> Signup and view all the answers

    In molecular machines, what input is required for them to perform a task?

    <p>Energy</p> Signup and view all the answers

    What motion is observed with an electric car powered by nanoscale molecules?

    <p>Rotational motion</p> Signup and view all the answers

    Which of the following molecules have a coordination number (CN) of 6 and exhibit octahedral symmetry plus Jahn-Teller distortion?

    <p>Cu(II)</p> Signup and view all the answers

    What kind of motion does the term 'pirouetting' describe in the context of molecular devices?

    <p>Spinning rotation</p> Signup and view all the answers

    What are some potential applications of molecular machines as speculated by researchers?

    <p>Computing, novel materials, and energy storage</p> Signup and view all the answers

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