pentafluorobenzoic acid
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Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5689 ◽  
Author(s):  
Maxim A. Shmelev ◽  
Mikhail A. Kiskin ◽  
Julia K. Voronina ◽  
Konstantin A. Babeshkin ◽  
Nikolay N. Efimov ◽  
...  

Varying the temperature of the reaction of [{Cd(pfb)(H2O)4}+n·n(pfb)−], [Ln2(pfb)6(H2O)8]·H2O (Hpfb = pentafluorobenzoic acid), and 1,10-phenanthroline (phen) in MeCN followed by crystallization resulted in the isolation of two type of products: 1D-polymers [LnCd(pfb)5(phen)]n·1.5nMeCN (Ln = Eu (I), Gd (II), Tb (III), Dy (IV)) which were isolated at 25 °C, and molecular compounds [Tb2Cd2(pfb)10(phen)2] (V) formed at 75 °C. The transition from a molecular to a polymer structure becomes possible because of intra- and intermolecular interactions between the aromatic cycles of phen and pfb from neighboring tetranuclear Ln2Cd2 fragments. Replacement of cadmium with zinc in the reaction resulted in molecular compounds Ln2Zn2 [Ln2Zn2(pfb)10(phen)2]·4MeCN (Ln = Eu (VI), Tb (VIII), Dy (IX)) and [Gd2Zn2(pfb)10(H2O)2(phen)2]·4MeCN (VII). A new molecular EuCd complex [Eu2Cd2(pfb)10(phen)4]·4MeCN (X)] was isolated from a mixture of cadmium, zinc, and europium pentafluorobenzoates (Cd:Zn:Ln = 1:1:2). Complexes II-IV, VII and IX exhibit magnetic relaxation at liquid helium temperatures in nonzero magnetic fields. Luminescent studies revealed a bright luminescence of complexes with europium(III) and terbium(III) ions.



2020 ◽  
Vol 46 (8) ◽  
pp. 557-572
Author(s):  
M. A. Shmelev ◽  
N. V. Gogoleva ◽  
G. N. Kuznetsova ◽  
M. A. Kiskin ◽  
Yu. K. Voronina ◽  
...  


Synlett ◽  
2017 ◽  
Vol 28 (11) ◽  
pp. 1295-1299 ◽  
Author(s):  
Yoshiji Takemoto ◽  
Taryn March ◽  
Akihiro Murata ◽  
Yusuke Kobayashi

The first enantioselective decarboxylative aldol addition with α-amido-substituted malonic acid half oxyesters (MAHOs) is described. The combined use of a newly designed bifunctional sulfonamide catalyst with pentafluorobenzoic acid as an additive afforded the β-hydroxy-α-amino acid derivatives in moderate to high yields and with high enantioselectivities.







ChemInform ◽  
2010 ◽  
Vol 30 (29) ◽  
pp. no-no
Author(s):  
I. T. Bazyl' ◽  
S. P. Kisil' ◽  
Y. V. Burgart ◽  
V. I. Saloutin ◽  
O. N. Chupakhin




2010 ◽  
Vol 317 (1-2) ◽  
pp. 89-96 ◽  
Author(s):  
L. Ravichandran ◽  
K. Selvam ◽  
M. Swaminathan


2009 ◽  
Vol 48 (23) ◽  
pp. 10467-10471 ◽  
Author(s):  
Jie Fu ◽  
Phillip E. Savage ◽  
Xiuyang Lu


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