Copper(II) bromide Copper bromide is a chemical compound . It is used in photographic processing as an intensifier and as a brominating agent in organic synthesis . It is also used in the copper vapor laser , a class of laser where the medium is copper bromide vapour formed in-situ from hydrogen bromide reacting with the copper discharge tube . Producing yellow or green light , it is used in dermatological applications.Synthesis Copper bromide can be obtained by combining copper oxide and hydrobromic acid:Purification Copper bromide is purified by crystallization twice from water, filtration to remove any CuBr and concentration under vacuum . This product is dehydrated using phosphorus pentoxide .In the solid state CuBr2 has a polymeric structure, with CuBr4 planar units connected on opposite sides to form chains. The crystal structure is monoclinic , space group C2/m, with lattice constants a = 714 pm , b = 346 pm, c = 718 pm, e ß = 121° 15'. CuBr2 monomeric units are present in the gas phase at high temperature.Reactions Copper bromide in chloroform-ethyl acetate reacts with ketones resulting in the formation of alpha-bromo ketones. The resulting product can be directly used for the preparation of derivatives. This heterogeneous method is reported to be the most selective and direct method of formation of α-bromo ketones. Dibromination of NPGs, n-pentenyl glycosides, using CuBr2 /LiBr reagent combination was performed in order for an NPG to serve as a glycosyl acceptor during halonium-promoted couplings. Such reaction gives high yield of the dibromides from alkenyl sugars that are resistant to a direct reaction with molecular bromine.Usage Copper bromide lasers produce pulsed yellow and green light and have been studied as a possible treatment for cutaneous lesions. Experiments have also shown copper bromide treatment to be beneficial for skin rejuvenation . It has been widely used in photography as its solution was used as the bleaching step for intensifying collodion and gelatin negatives. Copperbromide has also been proposed as a possible material in humidity indicator cards.Safety Copper bromide is harmful if swallowed. It affects the central nervous system , brain, eyes , liver, and kidneys. It causes irritation to skin, eyes, and respiratory tract .
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