
TY  - JOUR
A1  - Goodwin, HA 
A1  - Mather, DW 
A1  - Smith, FE 
T1  - Metal complexes of 1,10-phenanthroline derivatives. IX. <sup>5</sup>T<sub>2</sub> &#8596; <sup>1</sup>A<sub>1</sub> spin transitions in iron(II) complexes of 2-(1,10-phenanthrolin-2-yl)thiazole derivatives
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1975
VL  - 28
IS  - 1
SP  - 33
EP  - 39
KW  - 
UR  - https://doi.org/10.1071/CH9750033 
N2  - The preparation of the tridentate chelating agents 2-(1,10- phenanthrolin-2-yl)thiazole, 2-(1,10-phenanthrolin-2-yl)-4-(2- pyridyl)thiazole 2-(1,10-phenanthrolin-2-yl)thiazolidine and 2-(1,10- phenanthrolin-2-yl)benzothiazole is described. Data from the spectra of the bis-ligand nickel complexes indicate that the ligands all have field strengths in the iron(II) crossover region. The temperature dependence of the magnetism of the bis-ligand iron(II) complexes reveals that, except for the complexes of the pyridylthiazole, a smooth, temperature-induced 5T2 &#8596; 1A1 transition occurs in these compounds. For no complex is the transition complete within the experimental temperature range (83-363 K). The complex of the pyridylthiazole is high-spin throughout the range, the uncoordinated pyridyl group hindering the close approach of ligand and metal atom necessary for spin-pairing. The ability of the other ligands to induce a spin transition is primarily a consequence of distortions in the environment about the metal atom arising from coordination of the five- membered thiazole or related ring. 
ER  -

