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Related Concept Videos

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

6.1K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

6.0K
Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
6.0K
Types of Semiconductors01:20

Types of Semiconductors

1.9K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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β-Dicarbonyl Compounds via Crossed Claisen Condensations01:18

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Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds. The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Dual-functional semithiobambusurils.

Mandeep Singh1, Ephrath Solel, Ehud Keinan

  • 1Department of Natural Sciences, The Open University of Israel, 1 University Road, P.O. Box 808, Ra'anana 43107 (Israel), Fax: (+972) 97780661.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 25, 2014
PubMed
Summary
This summary is machine-generated.

New semithiobambusurils are macrocyclic host molecules that bind both anions and metal ions. Their structures reveal coordination polymers and unique anion-binding properties, expanding host-guest chemistry applications.

Keywords:
anion receptorsbambusurilglycolurilhost-guest systemssulfur ligands

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Area of Science:

  • Supramolecular Chemistry
  • Macrocyclic Chemistry
  • Materials Science

Background:

  • Macrocyclic host molecules are crucial in supramolecular chemistry for selective guest binding.
  • Existing host molecules often have limitations in binding diverse guests or specific binding sites.
  • The development of novel macrocyclic hosts with unique functionalities is an active area of research.

Purpose of the Study:

  • To synthesize and characterize a new family of macrocyclic host molecules, semithiobambusurils.
  • To investigate the dual binding capabilities of semithiobambusurils for both anions and metal ions.
  • To explore the structural and functional properties of these novel cavitands.

Main Methods:

  • Convenient and scalable synthesis of semithiobambusurils.
  • X-ray crystallography to determine solid-state structures.
  • Complexation studies with various anions and metal ions.

Main Results:

  • Successful synthesis of semithiobambusurils, a new class of macrocyclic hosts.
  • Demonstrated strong binding of diverse anions within the host cavity.
  • Observed metal ion binding at the sulfur-edged portals, forming coordination polymers.
  • Crystal structures revealed linear coordination polymers with HgCl2 and unique anion-binding characteristics with tetraphenylphosphonium bromide.

Conclusions:

  • Semithiobambusurils are versatile macrocyclic hosts with dual anion and metal ion binding capabilities.
  • The sulfur-edged portals facilitate the formation of coordination polymers with thiophilic metal ions.
  • The host cavity exhibits unique anion-binding properties, broadening the scope of host-guest chemistry.