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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Platinum polyoxoniobates.

P A Abramov1, C Vicent, N B Kompankov

  • 1Nikolaev Institute of Inorganic Chemistry Sb RAS, Lavrentiev Ave., Novosibirsk, 630090, Russia. abramov@niic.nsc.ru.

Chemical Communications (Cambridge, England)
|February 10, 2015
PubMed
Summary

Researchers synthesized novel platinum polyniobates, including a dimeric complex and a sandwich-type complex, by reacting niobium-oxygen clusters with platinum compounds. This work expands the known family of inorganic coordination compounds.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Polyniobates are inorganic clusters with diverse structures and potential applications.
  • Platinum complexes are of interest in catalysis and materials science.
  • The synthesis of novel polyniobate structures incorporating platinum is underexplored.

Purpose of the Study:

  • To synthesize and characterize novel platinum polyniobate compounds.
  • To investigate the structural diversity of platinum-niobium-oxygen clusters.
  • To explore the influence of reactant ratios on product formation.

Main Methods:

  • Hydrothermal synthesis involving the reaction of hexaniobate clusters ([Nb6O19](8-)) with a platinum precursor ([Pt(OH)4(H2O)2]).
  • Controlled variation of the molar ratio between platinum and niobium clusters.
  • Characterization of the resulting polyniobate complexes using appropriate analytical techniques (e.g., X-ray diffraction, spectroscopy - implied).

Main Results:

  • The first characterized platinum polyniobates were successfully synthesized.
  • A dimeric platinum polyniobate complex, [Nb6O19{Pt(OH)2}]2(12-), was formed at a 1:1 Pt/Nb6 molar ratio.
  • At a 1:2 Pt/Nb6 molar ratio, a mixture of the dimeric complex and a novel sandwich-type complex, [Pt(Nb6O19)2](12-), was obtained.

Conclusions:

  • The reaction conditions, particularly the Pt/Nb6 molar ratio, dictate the structure of the platinum polyniobates formed.
  • This study introduces new platinum-containing polyniobate architectures, expanding the scope of inorganic cluster chemistry.
  • The findings provide a foundation for further exploration of platinum polyniobate synthesis and properties.