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Tracking the HS-HS, HS-LS, and LS-LS States in the Spin Transition of a Dinuclear Fe(II) Complex by Broadband FTIR Spectroscopy

Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Highly resolved vibrational spectra of the mononuclear Fe(II) spin-crossover complex [Fe(bpz) 2 (bipy)]; (bpz = dihydrobis(pyrazolyl)borate) and its dinuclear counterpart [{Fe(bpz) 2 } 2 μ–(ac(bipy) 2 )] (ac(bipy) 2 = bridging ligand) are obtained by temperature-dependent far-infrared (FIR) spectroscopic measurements and assigned with the help of density functional theory (DFT) calculations. The experimental data confirm the high-spin (HS) state of the complexes at high temperature (≈ 200 K) and the low-spin (LS) state at 5 K. In the dimer, enhancement of otherwise absent vibrational modes at 335 cm –1 and 504 cm –1 around T 1/2 reflects the presence of a mixed-spin HS-LS state during the course of the spin transition between HS-HS and LS-LS. The metastable HS state of the dinuclear complex resulting from light irradiation (532 nm) at 10 K results from a direct spin-state transition from LS-LS to HS-HS.
Language: English
Open Access status: hybrid
Estimated APC paid: $4,500
OpenAlex ID: W4417028379
FWCI: 0.479
Cites: 50
Cited by: 3
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