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Related Concept Videos

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
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.
CFT focuses on...
31.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

19.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
19.0K
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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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Deciphering the Structural Relationships of Five Cd-Based Metal-Organic Frameworks.

Feng-Ling Yuan1, Yan-Qiu Yuan1, Meng-Yao Chao1

  • 1College of Chemistry, Chemical Engineering and Materials Science, Soochow University , Suzhou 215123, People's Republic of China.

Inorganic Chemistry
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This study synthesized novel metal-organic frameworks (MOFs) using cadmium and a pyridine-isophthalic acid ligand. One MOF exhibits fluorescence for selective iron(III) ion detection in water.

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Area of Science:

  • Materials Chemistry
  • Coordination Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are crystalline porous materials with diverse applications.
  • Developing new MOFs with tailored properties is crucial for advanced material science.
  • Luminescent MOFs offer potential for sensing and optical applications.

Purpose of the Study:

  • To synthesize novel two-dimensional (2D) and three-dimensional (3D) metal-organic frameworks (MOFs).
  • To investigate the structural transformations and interconversion of these MOFs.
  • To explore the luminescent properties of the synthesized MOFs for potential sensing applications.

Main Methods:

  • One-pot solvothermal synthesis of cadmium-based MOFs using Cd(NO3)2·4H2O and 5-(6-(hydroxymethyl)pyridin-3-yl)isophthalic acid (H2L).
  • Single-crystal X-ray diffraction for structural determination of MOFs.
  • Single-crystal to single-crystal (SCSC) transformation studies via thermal treatment.
  • Photoluminescence spectroscopy for optical property analysis.

Main Results:

  • Formation of a 2D MOF [Cd(L)(H2O)2] (A) and two 3D MOFs [Cd(L)(DMF)0.5] (B) and [Cd(L)] (C).
  • Conversion of MOF A to a 3D MOF [Cd(L)] (D) through a single-crystal to single-crystal transformation.
  • Isolation of a precursor 2D MOF [Cd(L)(DMF)] (E) that converts to MOF A in water.
  • Luminescence observed for H2L, A, D, and E upon excitation at 350 nm.
  • Selective detection of Fe3+ in water down to 0.58 ppm using the fluorescence of MOF A, with no interference from other metal ions.

Conclusions:

  • Successfully synthesized and characterized multiple cadmium-based MOFs with diverse dimensionalities.
  • Demonstrated controlled structural transformations, including SCSC conversion.
  • Established the potential of a synthesized MOF for highly selective and sensitive detection of Fe3+ ions in aqueous media.