4th EucheMs chemistry congress

Poster Session 2
s1230
chem. Listy 106, s257–s1425 (2012)
Poster session 2 - Nanochemistry, Nanotechnology
P - 0 7 3 5
SiLiCA CAPSuLe with AdJuStABLe SheLL
MorPhoLoGy
q. Ji 1 , J. P. hiLL 1 , K. AriGA 1
1 National Institute for Materials Science, MANA supermolecules
Group, Tsukuba, Japan
Hollow spheres or capsules are some of the most actively
investigated structures due to their potential applications in areas
including biology, synthesis, photonics and catalysis. Various
practical applications often require robustness and flexibility in
microcapsule-based materials. Structure-adjustable capsules have
been fabricated from inorganic components by using a
self-template method. The resulted microcapsules possess flake
shell which is composed by silica sheet with several nanomenter
thickness. The capsules shrink under thermal stimulus and their
structures can be adjusted by treatment at different pH. The flake
shell capsules were shown high loading efficiency on drug
molecules and DNA. In addition, the structrual flexibility in
tuning of shell pore diameters leads to tailored drug release over
prolonged periods.
4 th EucheMs chemistry congress
P - 0 7 3 6
effiCient uLLMAnn CroSS-CouPLinGS uSinG Pd
nAnoPArtiCLeS
M. JoShAGhAni 1 , e. rAfiee 1 , e. AzAdi 1
1 Razi University, Chemistry, Kermanshah, Iran
The Ullmann cross-coupling of aryl halides is an old but
very important rout for synthesis of dissymmetric biaryls specially
since introducing the palladium compounds as catalyst. [1] In the
other hand, palladium nanoparticles have unique applications as
catalyst in a wide variety of reactions. [2] Therefore, in continuation
of our previous study on cross-coupling reactions [3–4] , we
synthesized Pd nanoparticles via a simple method using
polyethyleneglycol as both reducing agent and stabilizer. The
efficiency of these palladium nanoparticles was investigated in
the cross coupling reaction of aryl halides. A wide variety of
substrates bearing different functional groups (electron
withdrawing and electron donating groups) in para position were
sufficiently coupled to yield the desired functionalized biaryls.
references:
1. M. Kotora, T. Takahashi, in “Handbook of
Organopalladium Chemistry for Organic Synthesis”,
E.-I. Negishi (Ed.), Wiley Interscience, NY, 2002.
2. C. Yang, H. Wustefeld, M. Kalwei, F. Schiith, “Studies in
Surface Science and Catalysis”, Vol. 154, Part C, 2004,
Pages 2574-2580.
3. Sh. Nadri, E. Azadi, A. Ataei, M. Joshaghani, E. Rafiee,
J. Organomet. Chem. 2011, 696, 2966-2970.
4. Sh. Nadri, M. Joshaghani, E. Rafiee, Organometallics
2009, 28, 6281–6287.
Keywords: Cross-Couplings; Nanoparticles; Palladium;
AUGUst 26–30, 2012, PrAGUE, cZEcH rEPUbLIc