Nature of the high-spin (5T2) α low-spin (1A1,) transition in [Fe(bipy)2(NCS)2]
✍ Scribed by S.K. Kulshreshtha; R.M. Iyer
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 304 KB
- Volume
- 108
- Category
- Article
- ISSN
- 0009-2614
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The transition temperature of [Fe@hen)z(NCS)z ] measured by susceptibility measurements in an applied tield of 1 T shifts by -0.11 f 0.04 K when the field is increased to 55 T. This shift is predicted on the basis of the known magnetic susceptibility and specific heat data.
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
57Fe hlijssbauer spectn bctwcen 4.2 and 298°K and magnetic data 'UC employed to dcmonstratc that Fe(ppi)2(NCS)2 exhibits a thermally induced high-spin (5T2) = low-spin ('A,) kansition associated with ;1 residual fraction 1(5Tz) =Z 0.59 (ppi = N-phcnyl-Z-pyridinaldhnine). ln the relalcd compound Fe(