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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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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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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Linear, Planar, Orbicular, and Macrocyclic Multinuclear Zinc (Meth)acrylate Complexes.

Takanori Iwasaki1, Gaito Suehisa1, Hiroshi Tadaoka2

  • 1Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 10, 2024
PubMed
Summary

Researchers explored how ligand structure affects zinc carboxylate complexes. They found that acrylate ligands form infinite chains and sheets, while methacrylate ligands form macrocycles, revealing new insights into coordination chemistry.

Keywords:
(meth)acrylatecrystallographymacrocyclemolecular packingzinc carboxylate

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Crystallography

Background:

  • Zinc carboxylate complexes serve as models for metalloenzymes and building blocks for porous coordination polymers (PCPs) and metal-organic frameworks (MOFs).
  • Understanding the influence of carboxylate ligand structure on the assembly of multinuclear zinc complexes is crucial but challenging due to coordination flexibility.

Purpose of the Study:

  • To investigate the relationship between monodentate carboxylate ligand structure and the molecular arrangement of multinuclear zinc carboxylate complexes.
  • To analyze the structural diversity of zinc (meth)acrylate complexes under varying conditions.

Main Methods:

  • Single-crystal X-ray diffraction analysis of synthesized zinc complexes.
  • Comparative study of zinc acrylate and zinc methacrylate complexes.
  • Hydrolysis experiments on tetranuclear zinc complexes.

Main Results:

  • Zinc acrylate formed linear infinite chain structures with a μ₄-oxido-bridged tetranuclear core ([Zn₄(μ₄-O)(OCOR)₆]).
  • Aqueous crystallization of zinc acrylate yielded a pentanuclear complex ([Zn₅(μ₃-OH)₂ (OCOR)₈]) with an infinite sheet-like structure, also obtainable via hydrolysis of the tetranuclear complex.
  • Zinc methacrylate, under similar aqueous conditions, retained its ligands to form a dodecanuclear macrocyclic complex.

Conclusions:

  • The structure of the carboxylate ligand (acrylate vs. methacrylate) dictates the self-assembly of multinuclear zinc complexes.
  • Ligand hydrolysis can lead to different nuclearities and structural motifs (chains, sheets, macrocycles).
  • This study highlights the tunable nature of zinc carboxylate complexes based on ligand modification and reaction conditions.