期刊
CHINESE JOURNAL OF CHEMISTRY
卷 31, 期 8, 页码 1015-1021出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.201300200
关键词
anion; semiconductors; thiourea; transformation
资金
- National Natural Science Foundation of China [21171007, 20701002, 21001006]
The transformation mechanisms of thiourea in ethylene glycol solution was systematically investigated in this report, which shows the transformation process is influenced by the anion (NO3-, Cl-, Br-) and polyvinylpyrrolidone (PVP). Thiourea (tu) isomerizes into ammonium thiocyanate when NO3- is present, regardless of the existence of PVP. For Cl-, thiourea coordinates with copper anion to form [Cu(tu)]Cl center dot 1/2H(2)O complex whether PVP is present. When it comes to Br-, thiourea hydrolyzes in the cooperation of PVP or coordinates with copper anion to form [Cu(tu)Br]center dot 1/2H(2)O complex without PVP. The different transformation routes will lead to different phase evolution of the Cu-S system. This work may provide a new understanding of the transformation of thiourea in ethylene glycol solution. The optical properties of the as-prepared copper sulfides exhibit significant stoichiometry-dependent features which may have potential applications in semiconductor photovoltaic devices.
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