Quaterpyridine

Pyridines which failed to produce detectable quantities of 2,2 -bipyridines include 2-aminopyridine, 3-aminopyridine, 3,5-dibromo-pyridine, and ethyl isonicotinate. 2,2 -Bipyridine failed to give any 2,2 6, 2 6",2" -quaterpyridine, and this is discussed in a later section. 

Quadrupole splitting constants, 37 129 Quantum mechanical methods, 38 424 Quantum mechanical predication, lattice energies and, 1 181-186 2,2 6, 2 6",2"-Quaterpyridine coordination compounds, 30 104-106 Structure, 30 70 Quenching center, 35 321 organometallics, 19 93-98 chemical, 19 98... 

The bis(methylthio)-substituted quarterpyridine, 4, 4"-bis(methylthio)-2,2 6, 2" 6, 2" -quaterpyridine (44), yields a binuclear copper(I) complex, but a mononuclear species with copper(II). ° A spectroelectrochemical study indicated that a redox-induced transformation occurs between these two complex species. The X-ray structure of the 2 2 [copper(I) ligand] helical complex confirmed that each copper is tetrahedrally co-ordinated to four pyridyl nitrogens from two ligand strands, with a short Cu-Cu distance of 3.32 A being present. 

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