NDLI: Tetragonal $Cu_{2}Se$ nanoflakes: synthesis using selenated propylamine as Se source and activation of Suzuki and Sonogashira cross coupling reactions

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Singh, Ajai Kumar Singh, Ved Vati
Description	Author Affiliation: Singh VV ( Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India. aksingh@chemistry.iitd.ac.in ajai57@hotmail.com.)
Abstract	The metastable tetragonal $Cu_{2}Se$ phase as nanoflakes has been synthesized for the first time by treating $CuCl_{2}$ taken in a mixture (1:1) of 1-octadecene and oleylamine with $H_{2}N–(CH_{2})_{3}–SePh$ dissolved in 1-octadecene. Powder X-ray diffraction (PXRD), HRTEM, SEM-EDX and XPS have been used to authenticate the nanoflakes. The XPS of $Cu_{2}Se$ nanoflakes indicates oxidation states of Cu and Se as +1 and −2 respectively. The size of the majority of $Cu_{2}Se$ nanoflakes was found to be between 12 and 14 nm. The nanoflakes have been explored for Suzuki and Sonogashira cross coupling reactions in the presence of TBAB in DMF and DMSO respectively. For Suzuki coupling conversion was found upto ∼86% in 15 h at 110 °C when loading of Cu was 1 mol%. In case of Sonogashira coupling conversion was found upto 82% in 15 h at 160 °C (Cu loading: 1 mol%). The catalytic efficiency of $Cu_{2}Se$ nanoflakes for Suzuki coupling reaction is greater than that for Sonogashira coupling. These nanoflakes have been found reusable for a second time. Most probably TBAB facilitates the release of CuBr from the nanoflakes which catalyze both reactions, as catalytic efficiency is very low in the absence of TBAB and CuBr has been found to activate readily both the coupling reactions. In comparison to many other copper based nano-crystals, the present nanoflakes are a better activator.
ISSN	14779226
Issue Number	2
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-01-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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