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Related Concept Videos

Coordination Number and Geometry02:57

Coordination Number and Geometry

15.2K
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.
15.2K
Metallic Solids02:37

Metallic Solids

18.0K
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...
18.0K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.4K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
9.4K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

11.9K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
11.9K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

25.7K
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...
25.7K
Valence Bond Theory02:42

Valence Bond Theory

8.3K
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...
8.3K

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Structural flexibility and mobility of coordination polymers on Cu(111).

Waka Nakanishi1,2, Masayuki Takeuchi1,2,3, Keisuke Sagisaka4

  • 1Molecular Design and Function Group, National Institute for Materials Science (NIMS) 1-2-1 Sengen, Tsukuba Ibaraki 305-0047 Japan NAKANISHI.Waka@nims.go.jp.

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Researchers tracked the movement of coordination polymers on surfaces using scanning tunneling microscopy (STM). They observed differences in mobility between branched and linear polymer structures at low temperatures.

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Area of Science:

  • Surface science
  • Materials science
  • Nanotechnology

Background:

  • Scanning tunneling microscopy (STM) enables atomic-level investigation of surface coordination polymers.
  • Analyzing dynamic behavior of these polymers at low temperatures is challenging due to strong ligand adsorption.

Purpose of the Study:

  • To design a novel ligand (2,7-dicyano-9,9-dimethyl-9H-fluorene, DCF) for studying coordination polymer mobility at low temperatures.
  • To understand how ligand design influences polymer dynamics and surface interactions.

Main Methods:

  • Utilized STM to observe DCF-copper (DCF-Cu) coordination polymers on a copper (Cu(111)) surface.
  • Employed density functional theory (DFT) calculations to analyze structural transformations.

Main Results:

  • Individual DCF ligands were tracked, revealing reduced interaction with the surface due to dimethyl groups.
  • Branched polymer structures showed less mobility than linear or short polymers with free ends upon heating (4 K to 78 K).
  • Observed polymer chain cleavage, recombination, and insertion, facilitated by flexible coordination angles.

Conclusions:

  • The study demonstrates distinct mobility differences based on coordination polymer architecture.
  • Ligand design, specifically the dimethyl group, is crucial for observing low-temperature dynamics.
  • Findings provide direct experimental evidence for structure-dependent polymer motion in surface-based systems.