Designing molecules that could be used for information processing and information storage is one of the main challenges in molecular materials science. Molecules that are suitable for such applications must be bistable: a characteristic that allows the presence of two different stable electronic states over a certain range of external perturbation. Typical examples of molecular species that exhibit such bistability are the spin-crossover (SCO) compounds. Since the discovery of the first SCO compound,[1] a variety of d n (n = 4-7) transition metal compounds exhibiting bistability between the high-spin (HS) and low-spin (LS) states have been reported. [2][3][4] Spin transition can be induced by variation of temperature, pressure, or illumination.[2-9] In general, temperature-dependent SCO behavior involves reversible spin transition from LS to HS upon heating and from HS to LS upon cooling.Although the SCO transition is due to the electronic structure of the single molecule and can be observed even in
A cobalt(ii) compound [Co(C14-terpy)(2)](BF(4))(2).MeOH (1) with long alkyl chains was prepared, and exhibited unique SCO at T(1) = 50 K and spin transition at T(2) upward arrow = 206 K and T(2) downward arrow = 184 K with hysteresis (DeltaT = 22 K) accompanying the motion of the long alkyl chains.
Dedicated to Emeritus Professor Ichiro Murata on the occasion of his 75th birthdayPhenalenyl-based hydrocarbons possess highly amphoteric redox properties that give low oxidation and high reduction potentials and afford stable multivalent redox species.[1] These compounds have frontier orbitals with a nonbonding molecular orbital (NBMO) character that results from a weak perturbation between singly occupied molecular orbitals (SOMOs) of the phenalenyl radical and the frontier orbitals of a central conjugated system. This perturbation leads to a[*] Dr.
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