
TY  - JOUR
A1  - Thompson, Alexander M. W. Cargill 
A1  - Batten, Stuart R. 
A1  - Jeffery, John C. 
A1  - Rees, Leigh H. 
A1  - Ward, Michael D. 
T1  - Some Coordination Chemistry of the Bidentate Nitrogen-Donor Ligand 2-(2-Aminophenyl)pyridine
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1997
VL  - 50
IS  - 2
SP  - 109
EP  - 114
KW  - 
UR  - https://doi.org/10.1071/C96146 
N2  - Complexes of the chelating bidentate nitrogen-donor ligand 2-(2-aminophenyl)pyridine (L) are described. &#91;PdL2&#93; &#91;PF6&#93;2 (1) forms two types of crystal (1a,b) of which (1a) was crystallographically characterized &#91;space group P 21/c a 10&#183;974(6), b 14&#183;757(4), c 8&#183;223(2) &#197;; &#946; 104&#183;66(5)&#176;; V 1288&#183;3(8) &#197;3; Z 2&#93;. It has a square-planar donor set about the metal, with the ligands mutually trans and with a twist of 35&#176; between the pyridyl and phenyl rings. 1 H n.m.r. spectroscopy shows that pure (1a) and (1b) equilibrate in solution; it is likely that (1b) is thecis form of the complex. Electrochemical measurements on &#91;Ru(bipy)2L&#93; &#91;PF6&#93;2 (2) show that the RuII /RuIIIcouple is cathodically shifted by 0&#183;34 V with respect to &#91;Ru(bipy)3&#93;2+ , indicating that replacing a pyridyl donor by an amine results in a significant increase of electron density on the metal centre: this effect is much larger with a primary amine ligand than with tertiary amines. The e.p.r. spectrum of &#91;CuL2&#93; &#91;PF6&#93;2 (3) shows that a small extent of association into a dinuclear complex occurs, a reaction which is solvent-dependent: addition of pyridine breaks up the dimer by coordination to the axial sites of the monomer, whose spectrum is characteristic of a tetragonal geometry (i.e. a planar array of two ligands L, and axial solvent molecules). Attempted recrystallization of other complexes of L from acetone afforded &#91;C14H15N2&#93; &#91;PF6&#93; (4), in which the free ligand L has condensed with acetone and then undergone an intramolecular cyclization by attack of the pyridyl nitrogen atom on the electrophilic carbon atom of the imine bond; this compound was also crystallographically characterized &#91;space group P 21/n; a 8&#183;258(2), b 10&#183;036(4), c 17&#183;976(7) &#197;; &#946; 100&#183;12(3)&#176;; V 1466&#183;8(10) &#197;3 ; Z 4&#93; 
ER  -

