... by bromination of 4,7-dihydroxy-1,10-phenanthroline CAS: 3922-40-5, which is an off-white powder with good solubility in ... most of organic solvents. There are several other names, e.g. 1,10-Phenanthroline ... 9-dibromo-o-phenanthroline; 2,9-dibromophenathroline;2,9-dibromo-1,10-diazaphenanthrene;2,9-Dibrom-1,10-phenanthrolin;2,9-Dibromo-1,10-phénanthroline.