
TY  - JOUR
A1  - Onggo, Djulia 
A1  - Scudder, Marcia L. 
A1  - Craig, Donald C. 
A1  - Goodwin, Harold A. 
T1  - Structural and Mossbauer Spectral Studies of Iron(II) Complexes of Thiazole-Containing Bidentates
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 2000
VL  - 53
IS  - 2
SP  - 153
EP  - 158
KW  - X-Ray crystallography; iron complexes; M&ouml;ssbauer spectra; diimine ligands.
UR  - https://doi.org/10.1071/CH99128 
N2  - Comparison of the M&ouml;ssbauer spectral data for low-spin tris(ligand) iron(II) complexes of the series of bidentate N&#8211;N ligands 2,2&#8242;-bipyridine (bpy), 4-(pyridin-2-yl)thiazole (4pyt), 2-(pyridin-2-yl)thiazole (2pyt), 4,4&#8242;-bithiazole (4bt) and 2,2&#8242;-bithiazole (2bt) shows a progressive reduction in the p-acceptor character of the ligand with increase in the number of thiazole rings, the effect being greater for the 4-thiazolyl derivatives. The structure of &#91;Fe(4pyt)3&#93;2+ is remarkably similar to that of &#91;Fe(bpy)3&#93;2+ with an average Fe&#8211;N distance of 1.96 &#197;. Attempts to characterize structurally &#91;Fe(2bt)3&#93;2+ were not successful and led to crystallization of &#91;Fe(2bt)2(H2O)2&#93; &#91;ClO4&#93;2&#183;(2bt)4. In the complex cation, which has the trans structure, the average Fe&#8211;N distance is 2.21 &#197; and the Fe&#8211;O distance is 2.08 &#197;. M&ouml;ssbauer spectral data indicate a quintet ground state for this species. &#91;Fe(4pyt)3&#93; &#91;BF4&#93;2&#183;H2O: monoclinic, space group P21/c, a 10.213(7), b 13.436(6), c 23.12(1) &#197;, b 109.65(3)&#x02DA;, Z 4. &#91;Fe(2bt)2(H2O)2&#93; &#91;ClO4&#93;2&#183;(2bt)4: triclinic, space group P&#8211;1, a 10.822(7), b 11.451(8), c 12.945(8) &#197;, a 70.31(5), b 69.92(5), g 63.32(6)&#x02DA;, Z 1. 
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