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Calorimetric investigations of the low-spin (1A1) ⇄ high-spin (5T2) transition in solid dithiocyanatobis(2,2'-BI-2-thiazoline)ir

✍ Scribed by S.K. Kulshreshtha; R. Sasikala; E. König

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
290 KB
Volume
123
Category
Article
ISSN
0009-2614

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✦ Synopsis

Based on measurements of differential scanning calorimetry, the first-order character of the spin-state transition in Fe(bt),(NCS), is established (bt = 2,2'-bi-2-thiazoline). The transition arises at T, ' =180.9 K and T,l =171.2 K, and is characterized by AH = 9.55 kO.7 kJ mol-' and AS = 54.5 *4 J Km' mall '. The value of AS suggests a significant contribution due to vibrational entropy. The values of the heat capacity Cp show a clear discontinuity at the transition temperature, the heat capacity change being AC, = 45 + 8 J K-' mall'.

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