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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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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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Aromatic Hydrocarbon Cations: Structural Overview

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Five-Membered Heterocyclic Aromatic Compounds: Overview

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Related Experiment Video

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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Published on: December 16, 2013

Hydrogen bonding and multiphonon structure in copper pyrazine coordination polymers.

S Brown¹, J Cao, J L Musfeldt

¹Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA.

Inorganic Chemistry

|September 12, 2007

Summary

This study reveals that hydrogen bonding in copper pyrazine coordination polymers influences their magnetic properties. These interactions stabilize long-range magnetic ordering at low temperatures.

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Area of Science:

Materials Science
Solid State Chemistry
Spectroscopy

Background:

Coordination polymers are versatile materials with tunable magnetic properties.
Fluoride ligands play a crucial role in the structure and magnetic behavior of coordination polymers.
Understanding the interplay between structure, bonding, and magnetism is key for designing novel magnetic materials.

Purpose of the Study:

To systematically investigate the temperature-dependent infrared vibrational spectra of copper pyrazine coordination polymers.
To elucidate the role of hydrogen bonding and multiphonon effects on the magnetic ordering of these materials.
To compare the spectroscopic findings with related one- and two-dimensional magnetic systems.

Main Methods:

Infrared (IR) spectroscopy was employed to study the vibrational spectra.
Temperature-dependent measurements were performed to observe spectral changes.
Comparison with existing data for prototype materials was conducted.

Main Results:

Observed unusual low-temperature hydrogen bonding and associated local structural transitions.
Identified striking multiphonon effects arising from the coupling of IR-active and Raman-active modes.
Spectroscopic evidence suggests these interactions are common in this class of coordination polymers.

Conclusions:

Hydrogen bonding and multiphonon effects are significant in copper pyrazine coordination polymers.
These interactions likely contribute to stabilizing long-range magnetic ordering at low temperatures.
Similar phenomena may be present in other molecule-based magnets.