[en] Dibromogallein is obtained - a new organic reagent of the trioxyfluorone series: 2,7 dibrom - 3,4,5 trioxy-9-(2'-carboxy-phenyl)-6-fluorone. Its spectral, acid-alcaline complexing, and analytical properties are studied. The reaction of gallein and dibromogallein with a number of ions of 3-4 group metals is investigated. The improvement is noted in analytical properties of metal complexes with gallein and dibromogallein in the presence of long-chain quaternary ammonium bases. Shown are analytical advantages of the new reagent as compared with gallein, and prospects of using dibromgallein in the photometric determination of molybdenum, tungsten, niobium, and tantalum