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- W2212615512 abstract "A series of four-coordinate iron tris(phosphine)borate phosphiniminato complexes (PhBP3RFeNPR'3) withvarying alkyl or aryl substituents (R = Ph, CH2Cy, m-terphenyl, iPr; R' = Ph, Cy, Et) have been synthesized andcrystallog. characterized. The spin states of these complexes vary depending on the ligand substituents, andmost undergo spin-crossover (S = 0 to S = 2) at temps. near or above room temp. in soln. and in the solidstate. The change in spin state also involves a significant change in the degree of π-bonding between Fe andthe N of the phosphiniminato ligand as well as dramatic changes in Fe-P bond lengths. Spin-crossover isaccompanied by striking changes in the UV-visible absorption spectra, which allowed for quant. modeling of thethermodn. parameters (ΔH and ΔS) of the spin equil. The complexes and their spin equil. have also beenstudied by paramagnetic NMR, IR spectroscopy, Moessbauer spectroscopy, and soln.- and solid-statemagnetometry. These studies lead to qual. correlations between the steric and electronic properties of theligand substituents and the enthalpy and entropy changes assocd. with the spin equil. in soln. This series ofcomplexes emphasizes the importance of considering sep. entropic and enthalpic effects when attempting tounderstand and predict trends in spin-crossover temps. (TC)." @default.
- W2212615512 created "2016-06-24" @default.
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- W2212615512 date "2015-08-01" @default.
- W2212615512 modified "2023-09-27" @default.
- W2212615512 title "Tunable spin equilibria in four-coordinate iron trisphosphine phosphiniminato complexes" @default.
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