dr hab. Jolanta EJFLER, prof. UWr
jolanta.ejfler@chem.uni.wroc.pl
ORCID ID 0000-0002-7467-1312
MSc 1987, PhD 1994, DSc 2010, Associate Prof. 2018
Phones:
+48 71 375 73 10 (office 1.053)
+48 71 375 76 38 (lab room 2.044)
The field of present scientific interests comprises:
- Synthesis and characteristics of metal-organic compounds, metal complexes, and their application in the reactions of polymerization and enantioselective catalysis
- Designing polymerization initiators of cyclic esters, on the basis of metals of the main groups complexes
- Synthesis and characteristics of biodegradable polymer materials
- Synthesis and characteristics of new monomers and macro-monomers
- Laboratory design - in the realm of disabled people performance
Since 2012 Dr. Ejfler is a head of Educational Department of Chemical Technology.
Selected publications
D. Jędrzkiewicz, G. Adamus, M. Kwiecień, Ł. John, J. Ejfler
Lactide as the playmaker of the ROP game: a theoretical and experimental investigation of ring-opening polymerization of lactide initiated by aminonaphtholate zinc complexes
Inorg. Chem. 2017, 56, 1349-1365
D. Jędrzkiewicz, J. Ejfler, Ł. John, S. Szafert
Zebra reaction or the recipe for heterodimeric zinc complexes synthesis
Dalton Trans. 2016, 45, 2829-2838
A series of asymmetric heterodimeric zinc complexes have been synthesized in the direct reaction between conformationally flexible chiral/achiral homodimers. The cooperative activity of steric factors and coordination codes resulted in an intriguing chiral self-sorting process. Herein, we are reporting our recent exploration of the first example of such a type of reaction.
M. Janeta, Ł. John, J. Ejfler, S. Szafert
Multifunctional imine-POSS as uncommon 3D nanobuilding blocks for supramolecular hybrid materials: synthesis, structural characterization and properties
Dalton Trans. 2016, 45, 12312-12321
Ł. John, M. Janeta, M. Rajczakowska, J. Ejfler, D. Łydżba, S. Szafert
Synthesis and microstructral properties of the scaffold based on a 3-(trimethoxysilyl)propylmethacrylate-POSS hybrid towards potential tissue engineering applications
RSC Adv. 2016, 6, 66037-66047
M. Janeta, Ł. John. J. Ejfler, S. Szafert
Novel organic-inorganic hybrids based on T8 and T10 silsesquioxanes: synthesis, cage-rearrangement and properties
RSC Adv. 2015, 5, 72340-72351
D. Jędrzkiewicz, J. Ejfler, N. Gulia, Ł. John, S. Szafert
Designing ancillary ligands for heteroleptic/homoleptic zinc complex formation: synthesis, structures and application in ROP of lactides
Dalton Trans. 2015, 44, 13700-13715
Synthesis and characterization of a series of new amino-phenol/naphthol ligands (L1,2-H), have been developed and their respective zinc complexes (1, 2-Zn) have been synthesized. The molecular structure of L1-H and 1, 2-Zn explored in detail by NMR, single-crystal X-ray studies and DFT calculations, confirmed existence of complexes as stabile dimers both in a solution and in a solid state. All complexes mediate the ring - opening polymerization (ROP) of lactide highly efficiently, at room temperature, in a controlled fashion. The influence of architecture of the ligand on the desired homo/heteroleptic complex formation, as well as the relationship between the initiator design and the catalytic activity have been investigated.
D. Jędrzkiewicz, I. Czeluśniak, M. Wierzejewska, S. Szafert, J. Ejfler
Well-contolled zinc-catalyzed synthesis of low molecular weight oligolactides by ring opening reaction
J. Mol. Catal. A: Chemical 2015, 396, 155-163
The paper describes a comparative study on a precise synthesis of short oligomers by ring-opening polymerization of L-lactide (L-LA) with ZnL2 (L = aminophenolate) or Sn(Oct)2 (Oct = bis(2-ethylhexanoate)) as initiators and propargyl alcohol as a co-initiator. The oligolactide synthesis is much more efficacious in the presence of zinc initiator than in the case of tin compound. Moreover, under an appropriate molar ratio of zinc complex/LA/alcohol, the catalytic reaction can yield either oligomers or alkyl lactyllactates or alkyl lactates. DFT calculations concerning the 1:1 or 1:2 complexes of methyl lactyllactate with methanol reveals a selectivity mechanism of zinc complex towards one of these processes. As for the tin compound, it appears not selective towards alcoholysis and hence oligolactide must always be accompanied by the formation of alkyl lactyllactate. Hence, when a lowmolecular-weight oligomer constitutes a synthetic priority, quenching the reaction with hexanes or heptane is much more effective.
M. Janeta, Ł. John, J. Ejfler, S. Szafert
High-yield synthesis of amido-functionalized polyoctahedral oligomeric silsesquioxanes by using acyl chlorides
Chem. Eur. J. 2014, 20, 15966-15974
J. Wojtaszak, K. Mierzwicki, S. Szafert, N. Gulia, J. Ejfler
Homoleptic aminophenolates of Zn, Mg and Ca. Synthesis, structure, DFT studies and polymerization activity in ROP of lactides
Dalton Trans. 2014, 43, 2424-2436
The reaction of MgBu2, ZnEt2 or Ca(OiPr)2 with 2 eq of three-coordinating N-[methyl(2-hydroxy -3,5 -dimethylphenyl)] -N-methy l-N-methyl-1,3 -oxolaneamine (mpoa-H) or N-[methyl (2- hydroxyl -3,5- di -tert-butylphenyl)] -N- methyl N-methyl -1,3 -oxolaneamine (tbpoa-H) gave neutral, monomeric [Mg(mpoa)2], [Zn(mpoa)2], [Zn(tbpoa)2], and [Ca(tbpoa)2] as white powders in 58-90% yields. The resulting aminophenolates were characterized in solution by NMR showing in the case of [Zn(tbpoa)2] an interesting dynamics. [Zn(tbpoa)2] and [Ca(tbpoa)2] were characterized by X-ray crystallography to show Zn atom to be pseudo-octahedrally coordinated and the Ca atom in six-coordination mode. The new homoleptic complexes were tested in the polymerization of lactide with an external alcohol to reveal stable behavior (during the polymerization process) only in case of [Zn(tbpoa)2]. The high activity of the catalyst were correlated with a ligand flexibility what was further supported by theoretical studies.
J. Kukuła, J. Ejfler
Niepełnosprawni w laboratorium
Laboratorium 2013, 11-12, 20-23
Training in the realm of widely-understood safety in a chemical laboratory, comprises a review of most recent legal acts, marking systems, risk diagnosis, the analysis of risk assessment schemes, prevention etc. Practical competence trainings, which verify theory with practice of safe laboratory performance, constitute a much limited offer. Over the course of such activities, one can assess a series of potential problems, connected with preparation and estimation of a safe workplace. Planning a laboratory without barriers for disabled people is one of them. The work presents the creation process of a workplace, on the basis of an educational workshop, for people afflicted with reduced mobility.
A. Grala, J. Ejfler, L. B. Jerzykiewicz, P. Sobota
Chemioselective alcoholysis of lactide mediated by a magnesium catalyst: an efficient route to alkyl lactyllactate
Dalton Trans. 2011, 40, 4042-4044
J. Ejfler, K. Krauzy-Dziedzic, S. Szafert, L. B. Jerzykiewicz, P. Sobota
Synthesis, characterization and catalytic study of aryloxido magnesium complexes
Eur. J. Inorg. Chem. 2010, 3602-3609
J. Ejfler, K. Krauzy-Dziedzic, S. Szafert, T. Lis, P. Sobota
Novel chiral and achiral benzoxazine monomers and their thermal polymerization
Macromolecules 2008, 42, 4008-4015
J. Ejfler, S. Szafert, K. Mierzwicki, L. B. Jerzykiewicz, P. Sobota
Homo- and heteroleptic zinc aminophenolates as initiators for lactide polymerization
Dalton Trans. 2008, 6556-6562
K. Krauzy-Dziedzic, J. Ejfler, S. Szafert, P. Sobota
Titanium and zirconium benzofuranoxides. Crystal structure and catalytic properties
Dalton Trans. 2008, 2620-2626
J. Ejfler, M. Kobyłka, L. B. Jerzykiewicz, P. Sobota
Titanium complexes supported by bis(aryloxo) ligand: structure and lactide polymerization activities
J. Mol. Catal. A: Chemical 2006, 257, 105-111
J. Utko, J. Ejler, S. Szafert, Ł. John, L. B. Jerzykiewicz, P. Sobota
Deoligomerization by cocomplexation: syntheses and structures of aluminium-calcium alkoxides and aryloxides
Inorg. Chem. 2006, 45, 5302-5306
J. Ejfler, M. Kobyłka, L. B. Jerzykiewicz, P. Sobota
Highly efficient magnesium initiators for lactide polymerization
Dalton Trans. 2005, 2047-2050
J. Ejfler, M. Kobyłka, M. Hojniak, P. Sobota
The influence of cocatalysts on phenylacetylene oligo and polymerization
J. Mol. Catal. A: Chemical 2004, 224, 93-96