Chemical vapor transport and solid-state exchange synthesis of new copper selenite bromides

摘要

A new dimorphic copper selenite bromide, Cu-5(SeO3)(4)Br-2 was obtained via chemical transport reactions. alpha-Cu-5(SeO3)(4)Br-2, monoclinic (1m) and beta-Cu-5(SeO3)(4)Br-2,Br- triclinic (la) polymorphs were produced simultaneously upon reaction of amorphous, partially dehydrated copper selenite and copper bromide. lm is similar to Cu-5(SeO3)(4)Br-2, whereas la is distantly related to Ni-5(SeO3)(4)Br-2 and Cu-5(SeO3)(4)Br-2. Attempts to reproduce synthesis of la via exchange reaction between Na2Se03 and CuBr2 resulted in a new Na-2[Cu7O2](SeO3)(4)Br-4 (2). Current study demonstrates for the first time, that both chemical vapor and exchange reactions can be employed in preparation of new selenite halides. (C) 2016 Elsevier Masson SAS. All rights reserved.