%0 Journal Article %A Hauser, Andreas %A Gütlich, Philipp %A Spiering, Hartmut %T High-spin -> low-spin relaxation kinetics and cooperative effects in the hexakis(1-propyltetrazole)iron bis(tetrafluoroborate) and [Zn1-xFex(ptz)6](BF4)2 (ptz = 1-propyltetrazole) spin-crossover systems %J Inorganic Chemistry %@ 0020-1669 %V 25 %N 23 %P 4245-4248 %D 1986 %U http://pubs.acs.org/doi/abs/10.1021/ic00243a036 %R 10.1021/ic00243a036 %U http://archive-ouverte.unige.ch/unige:3095 %X [Fe(ptz)6l(BF4)2 (ptz= 1-propyltetrazole) and the mixed crystals [Znl,Fe,(ptz)6] (BF4)2 are Fe(I1) spin-crossover compoundsthat exhibit light-induced excited-spin-state trapping. It is shown that (a) for x I 0.1 a single-ion treatment of both the spinequilibrium ( M H L = 510 (12) cm-\', ASHL = 5.1 (2) cm-\'/K at T = 100 K) and the relaxation from the excited high-spin state (.Eao = 810 (30) cm-I, A - 105/s) is appropriate and (b) for 0.2 I x I 1 cooperative effects observed in the relaxation from the high-spin state are of long-range nature and therefore of elastic rather than of electronic origin.