Journal
INORGANIC CHEMISTRY
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.2c02177
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Funding
- Ministry of Education and Science of Ukraine [22BF037-03, 22BF037-09]
- UEFSCDI [TE 123/2020, PNIII-P1-1.1-TE-2019-2194]
- Armed Forces of Ukraine
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This paper describes a new 2D coordination polymer with hysteretic spin crossover behavior, which exhibits attractive features such as thermochromism, stability upon thermal cycling, and significant volume expansion during the spin crossover process.
Hysteretic spin crossover in coordination complexes of 3d-metal ions represents one of the most spectacular phenomena of molecular bistability. In this paper we describe a self-assembly of pyrazine (pz) and Fe(BH3CN)2 that afforded the new 2D coordination polymer [Fe(pz)2(BH3CN)(2)]. It undergoes an abrupt, hysteretic spin crossover (SCO) with a T1/2 of 338 K (heating) and 326 K (cooling) according to magnetic susceptibility measurements. Mo''ssbauer spectroscopy revealed a complete transition between the low-spin (LS) and the high-spin (HS) states of the iron centers. This LS-to-HS transition induced an increase of the unit cell volume by 10.6%. Meanwhile, a modulation of multiple [C-H delta+...H delta--B] dihydrogen bonds stimulates a contraction in direction c (2.2%). The simplicity of the synthesis, mild temperatures of transition, a pronounced thermochromism, stability upon thermal cycling, a striking volume expansion upon SCO, and an easy processability to composite films make this new complex an attractive material for switchable components of diverse applications.
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