PMID- 34578576
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20240403
IS  - 2079-4991 (Print)
IS  - 2079-4991 (Electronic)
IS  - 2079-4991 (Linking)
VI  - 11
IP  - 9
DP  - 2021 Aug 31
TI  - Green Synthesis of Cu Nanoparticles in Modulating the Reactivity of 
      Amine-Functionalized Composite Materials towards Cross-Coupling Reactions.
LID - 10.3390/nano11092260 [doi]
LID - 2260
AB  - Control over both dispersion and the particle size distribution of supported 
      metal particles is of paramount importance for the catalytic activity of 
      composite materials. We describe the synthesis of materials with Cu nanoparticles 
      well-dispersed on different amine-functionalized supports, using the extract of 
      Wallich Spurge as a green, reducing agent. Graphene oxide (GO), mesoporous silica 
      (MCM-41), mesoporous zirconia, and reduced graphene oxide-mesoporous silica 
      (RGO-MCM-41) were explored as supports. Cu nanoparticles were better stabilized 
      on RGO-MCM-41 compared to other supports. The novel composite materials were 
      characterized by X-ray diffraction (XRD), Raman spectra, Scanning electron 
      microscope (SEM), Transmission electron microscopy analysis and HR-TEM. SEM and 
      EDX techniques. High angle XRD confirmed the conversion of graphene oxide to 
      reduced graphene oxide (RGO) with plant extract as a reducing agent. Both XRD and 
      TEM techniques confirmed the Cu nanoparticle formation. The catalytic activity of 
      all the prepared materials for the Ullmann coupling reactions of carbon-, 
      oxygen-, and nitrogen-containing nucleophiles with iodobenzene was evaluated. 
      From the results, 5 wt% Cu on amine-functionalized reduced graphene 
      oxide/mesoporous silica nanocomposite (5 wt%Cu(0)-AAPTMS@RGO-MCM-41) exhibited 
      excellent efficiency with 97% yield of the C-C coupling product in water at 80  degrees C 
      in 5 h. The activity remained unaltered almost up to the fourth cycle. The Cu 
      nanoparticles stabilized by organic amine group on RGO hybrid facilitated 
      sustained activity.
FAU - Rana, Surjyakanta
AU  - Rana S
AD  - School of Chemistry & Physics, College of Agriculture, Engineering & Science, 
      University of KwaZulu-Natal, Durban 4041, South Africa.
FAU - Varadwaj, G Bishwa Bidita
AU  - Varadwaj GBB
AD  - School of Chemistry & Physics, College of Agriculture, Engineering & Science, 
      University of KwaZulu-Natal, Durban 4041, South Africa.
FAU - Jonnalagadda, Sreekanth B
AU  - Jonnalagadda SB
AUID- ORCID: 0000-0001-6501-8875
AD  - School of Chemistry & Physics, College of Agriculture, Engineering & Science, 
      University of KwaZulu-Natal, Durban 4041, South Africa.
LA  - eng
PT  - Journal Article
DEP - 20210831
PL  - Switzerland
TA  - Nanomaterials (Basel)
JT  - Nanomaterials (Basel, Switzerland)
JID - 101610216
PMC - PMC8464933
OTO - NOTNLM
OT  - C-C coupling
OT  - C-N coupling
OT  - C-O coupling
OT  - amine functionalized
OT  - reduced graphene oxide composite
COIS- The authors declare no conflict of interest.
EDAT- 2021/09/29 06:00
MHDA- 2021/09/29 06:01
PMCR- 2021/08/31
CRDT- 2021/09/28 01:26
PHST- 2021/07/14 00:00 [received]
PHST- 2021/08/06 00:00 [revised]
PHST- 2021/08/10 00:00 [accepted]
PHST- 2021/09/28 01:26 [entrez]
PHST- 2021/09/29 06:00 [pubmed]
PHST- 2021/09/29 06:01 [medline]
PHST- 2021/08/31 00:00 [pmc-release]
AID - nano11092260 [pii]
AID - nanomaterials-11-02260 [pii]
AID - 10.3390/nano11092260 [doi]
PST - epublish
SO  - Nanomaterials (Basel). 2021 Aug 31;11(9):2260. doi: 10.3390/nano11092260.