
TY  - JOUR
A1  - Benniston, Andrew C. 
A1  - Farrugia, Louis J. 
A1  - Mackie, Philip R. 
A1  - Mallinson, Paul 
A1  - Clegg, William 
A1  - Teat, Simon J. 
T1  - Properties and single-crystal X-ray structure of Bis[3,3&Prime;-bis(4-methylphenyl)-2,2&#8242;:6&#8242;,2&Prime;-terpyridine]iron(II) hexafluorophosphate&#8211;acetonitrile&#8211;diisopropyl ether (1/1.5/1)
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 2000
VL  - 53
IS  - 8
SP  - 707
EP  - 713
KW  - Terpyridine; synthesis; iron complex; X-ray crystal structure; spectroscopy.
UR  - https://doi.org/10.1071/CH99167 
N2  - Absorption and electrochemical properties are reported for the iron(II) complex of the unusually substituted ligand 3,3&Prime;-bis(4-methylphenyl)-2,2&#8242;:6&#8242;,2&Prime;-terpyridine, along with the structure determination of the complex by single-crystal X-ray crystallography. Crystal data for C67H64.5F12FeN7.5OP2, M 1336.6: triclinic, a 12.768(3), b 15.789(4), c 17.160(4) &#197;, &#945; 85.553(6), &#946; 77.756(6), &#947; 66.754(5)&#x02DA;, V 3106.1(12) &#197;3, space group P 1, Z 2, &rho; 1.43 g cm&#8211;3, &#181; 0.30 mm-1 for &lgr; 0.6849 &#197;, R 0.091 for 4456 observed (I &#62; 2&#963;(I) ) reflections, wR2 0.241, &#916;&rho;1.68 e &#197;&#8211;3. The structural analysis reveals that, as observed in analogous bisterpyridineiron(II) complexes, the ligands adopt the preferred meridional binding motif. As a result, the &#8216;pulling-in&#8217; of the outer pyridine rings forces each pair of 3,3&Prime; substituted tolyl groups to diverge, resulting in an average distance between the tolyl methyl groups of c. 11.6 &#197;. The cyclic voltammetery of the complex in MeCN displays upon oxidative scanning a reversible one-electron wave (E&#x02DA; = + 0.99 V v. s.c.e.) and three one-electron waves under reducing conditions (E1&#x02DA; = &#8211;1.27 V, E2&#x02DA; = &#8211;1.51 V, E3&#x02DA; = &#8211;1.96 V v. s.c.e.). The electronic spectrum in acetonitrile contained an MLCT band centred at 571 nm, with a molar absorption coefficient of 18210 M&#8211;1 cm&#8211;1. When compared to similar phenyl-substituted terpyridine ligand iron(II) complexes this is a relatively low value and is assigned to reduced electronic delocalization throughout the terpyridine backbone. 
ER  -

