The ligand, 2, 9-diphenyl-4, 7-dimethyl-1, 10-phenanthroline.

Ainscough, E. (1968). The ligand, 2, 9-diphenyl-4, 7-dimethyl-1, 10-phenanthroline. PhD Thesis, Department of Chemistry, The University of Queensland.

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Author Ainscough, E.
Thesis Title The ligand, 2, 9-diphenyl-4, 7-dimethyl-1, 10-phenanthroline.
School, Centre or Institute Department of Chemistry
Institution The University of Queensland
Publication date 1968
Thesis type PhD Thesis
Supervisor Professor R.A. Plowman,
Total pages 226
Language eng
Subjects 0305 Organic Chemistry
Formatted abstract The organic ligands 2,9-diphenyl-4,7-dimethyll, 10-phenanthroline (abbreviated dpp) and 2,9-diphenyl- 3 ,4 ,7 ,8-tetramethyl-l, 10-phenanthroline have been synthesized (the latter for the first time), and dpp has been fully characterized by means of nuclear magnetic resonance, ultraviolet and infrared spectral measurements. A number of coordination compounds of dpp with several transition metals have been isolated and their structures determined, as far as possible, by means of conductivity, magnetic susceptibility, both visible and infrared spectra and X-ray powder photographs. Because of interference of the phenyl groups in the 2,9 positions, two molecules of dpp coordinated to a metal ion cannot exist in a planar arrangement, and where only one dpp molecule was coordinated to the metal there was evidence that there was distortion of the square planar arrangement.

The complexes of copper(II) which have been isolated include both the mono and bis (dpp) species, and provide examples of four-coordination for the former, and probably four for the latter. For the mono dpp complexes, polymeric octahedrally coordinated structures are prevented because of the steric interaction of phenyl groups of opposing molecules of dpp. Conversion to the mionovalent copper (I) state was accomplished by reaction with hypophosphorus acid.

Bis dpp complexes of silver (I) were isolated as well as mixed ligand complexes of the type AgAdpp NO3 (A = 2-methyl-1,10-phenanthroline, or 2,9-dimethyl-1,10- phenanthroline) , and AgBdpp CIO4 (B = pyridine and 2,4- lutidine). Characterisation of the latter was restricted by their low solubility.

A limited number of mono and bis dpp complexes of divalent iron, cobalt, nickel and palladium were also prepared, showing that dpp will coordinate with a wide range of transition metals.

Keyword Complex compounds.

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