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Crossover Experiments01:16

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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Oxidative reactions are pivotal in metabolizing numerous compounds, including pharmaceutical drugs. These reactions often occur in carbon-heteroatom systems, such as carbon-nitrogen, carbon-sulfur, and carbon-oxygen.
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Heteroatom substitution effects in spin crossover dinuclear complexes.

Samantha Zaiter1, Charlotte Kirk2, Matthew Taylor3

  • 1School of Chemistry, The University of Sydney, New South Wales 2006, Australia.

Dalton Transactions (Cambridge, England : 2003)
|March 19, 2019
PubMed
Summary
This summary is machine-generated.

Heteroatom substitution in dinuclear iron materials significantly alters spin crossover (SCO) properties. Sulfur and selenium variations lead to diverse SCO behaviors, from gradual transitions to rare two-step switching, impacting material functionality.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Spin crossover (SCO) materials exhibit distinct high-spin (HS) and low-spin (LS) states, tunable by external stimuli.
  • Dinuclear iron complexes offer a platform for investigating cooperative SCO phenomena and structure-property relationships.
  • Heteroatom substitution is a key strategy for modulating the electronic and structural properties of SCO materials.

Purpose of the Study:

  • To investigate the impact of heteroatom (sulfur vs. selenium) substitution on the SCO properties of dinuclear iron complexes.
  • To explore the influence of different organic linkers (furtrz vs. thtrz) on SCO behavior.
  • To establish structure-function correlations for rationalizing diverse spin-switching phenomena in these materials.

Main Methods:

  • Synthesis and characterization of dinuclear iron complexes with varying heteroatoms (X=S, Se) and organic linkers (furtrz, thtrz).
  • Variable-temperature magnetic susceptibility measurements to probe spin crossover transitions.
  • Single-crystal X-ray diffraction analysis to elucidate structural changes associated with spin transitions.

Main Results:

  • The furtrz family ([Fe2(NCX)4(furtrz)5]) exhibited gradual, incomplete one-step SCO transitions, with T1/2 values of 172 K (furtrz-S) and 205 K (furtrz-Se).
  • Structural evolution from [HS-HS] to [HS-LS] states was observed per dinuclear species in the furtrz family.
  • The thtrz family showed varied SCO behavior: thtrz-S was SCO-inactive (HS), while thtrz-Se displayed a rare complete two-step SCO transition (T1/2(1,2) = 170, 200 K) from [HS-HS] to [LS-LS] without long-range ordering at the intermediate plateau.

Conclusions:

  • Heteroatom substitution and the choice of organic linker critically influence the SCO properties of dinuclear iron materials.
  • The thtrz-Se complex represents a rare example of a dinuclear SCO material exhibiting a complete two-step transition.
  • Detailed structure-function analyses provide insights into the mechanisms governing diverse spin-switching behaviors in these systems.