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Related Concept Videos

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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Metal-Ligand Bonds02:51

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Properties of Transition Metals02:58

Properties of Transition Metals

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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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Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Exceptions to the Octet Rule02:55

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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Related Experiment Video

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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First-row transition-metal-diborane and -borylene complexes.

Dudekula Sharmila1, Bijan Mondal, Rongala Ramalakshmi

  • 1Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036 (India), Fax: (+91) 44 2257 4202.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 18, 2015
PubMed
Summary
This summary is machine-generated.

This study synthesizes novel Group 7 metal complexes featuring borane, borylene, and boride clusters. Researchers investigated their structures and bonding, revealing unique B-H-Mn interactions and enhanced B-B bonding in a manganese complex.

Keywords:
X-ray diffractionboranescobaltdensity functional calculationsmanganese

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Area of Science:

  • Organometallic chemistry
  • Inorganic chemistry
  • Materials science

Background:

  • Boron-containing clusters are crucial in catalysis and materials science.
  • Understanding the synthesis and bonding of novel metal-boron complexes is key to developing new functionalities.

Purpose of the Study:

  • To synthesize and characterize new Group 7 metal complexes with borane, borylene, and boride ligands.
  • To investigate the structural, bonding, and electronic properties of these novel compounds using experimental and computational methods.

Main Methods:

  • Synthesis of metal-boron complexes using reactions involving cobalt, manganese, rhenium, and ruthenium carbonyls with borane sources.
  • Characterization using multinuclear NMR spectroscopy (1H, 11B, 13C), mass spectrometry, and X-ray diffraction analysis.
  • Quantum chemical calculations (DFT) to elucidate bonding and electronic structures.

Main Results:

  • Successful synthesis of a manganese hexahydridodiborate (1), triply bridged borylene complexes (2-4), and a heterometallic boride cluster (5).
  • X-ray structure of compound 1 revealed a notably short boron-boron bond.
  • Spectroscopic data and DFT computations highlighted dominant B-H-Mn interactions, weak B-B-Mn interactions, and enhanced B-B bonding in compound 1.

Conclusions:

  • The study presents a diverse range of novel Group 7 metal-boron complexes with unique structural and bonding characteristics.
  • The findings offer insights into the reactivity of boranes with transition metals and the formation of unusual boron-containing clusters.
  • This work contributes to the fundamental understanding of metal-boron bonding and opens avenues for designing new functional materials.