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Papers by Dawid Jędrzkiewicz

Research paper thumbnail of Tigecycline Absorption Improved by Selected Excipients

Pharmaceuticals

To investigate the effects of (2,6-di-O-methyl)-β-cyclodextrin (DM-β-CD), (2-hydroxypropyl)-β-cyc... more To investigate the effects of (2,6-di-O-methyl)-β-cyclodextrin (DM-β-CD), (2-hydroxypropyl)-β-cyclodextrin (HP-β-CD), tocopherol polyethylene glycol 1000 succinate (TPGS), sodium desoxycholate (SDOCH), trimethyl chitosan (TMC), and sodium caprate (C10) on the plasma concentration and the oral bioavailability of tigecycline in broiler chickens. To test the effects of the excipients on absorption of tigecycline, a tetracycline that is poorly absorbed from the gastrointestinal tract, broiler chickens were used as an animal model. Tigecycline (10 mg/kg body weight) was administered intravenously, orally, and orally with one of the excipients. Plasma samples were taken after administration. To measure tigecycline concentrations, high-performance liquid chromatography coupled with tandem mass spectrometry was used. Compartmental and non-compartmental analyses were used for pharmacokinetic analyses of mean plasma concentrations versus time. With the exception of sodium caprate, all the exc...

Research paper thumbnail of Sodium complexes as precise tools for cutting polymer chains. Exploration of PLA degradation by unique cooperation of sodium centers

Inorganic Chemistry Frontiers

The challenge for the future of plastics is closed-loop plastic recycling and polymer waste degra... more The challenge for the future of plastics is closed-loop plastic recycling and polymer waste degradation. The exploration of the structural nuances of the sodium compounds presented in this paper shows how to design “tools for cutting polymer chains”.

Research paper thumbnail of Alkaline‐Earth Metal Mediated Benzene‐to‐Biphenyl Coupling

Angewandte Chemie International Edition

Complex [(DIPePBDI)Ca]2(C6H6), with a C6H62− dianion bridging two Ca2+ ions, reacts with benzene ... more Complex [(DIPePBDI)Ca]2(C6H6), with a C6H62− dianion bridging two Ca2+ ions, reacts with benzene to yield [(DIPePBDI)Ca]2(biphenyl) with a bridging biphenyl2− dianion (DIPePBDI=HC[C(Me)N‐DIPeP]2; DIPeP=2,6‐CH(Et)2‐phenyl). The biphenyl complex was also prepared by reacting [(DIPePBDI)Ca]2(C6H6) with biphenyl or by reduction of [(DIPePBDI)CaI]2 with KC8 in presence of biphenyl. Benzene‐benzene coupling was also observed when the deep purple product of ball‐milling [(DIPPBDI)CaI(THF)]2 with K/KI was extracted with benzene (DIPP=2,6‐CH(Me)2‐phenyl) giving crystalline [(DIPPBDI)Ca(THF)]2(biphenyl) (52 % yield). Reduction of [(DIPePBDI)SrI]2 with KC8 gave highly labile [(DIPePBDI)Sr]2(C6H6) as a black powder (61 % yield) which reacts rapidly and selectively with benzene to [(DIPePBDI)Sr]2(biphenyl). DFT calculations show that the most likely route for biphenyl formation is a pathway in which the C6H62− dianion attacks neutral benzene. This is facilitated by metal‐benzene coordination.

Research paper thumbnail of CCDC 1982025: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1961592: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1961591: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1525787: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of CCDC 1860480: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1495736: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of CCDC 1547955: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1835932: Experimental Crystal Structure Determination

Research paper thumbnail of DFT calculations as a ligand toolbox for the synthesis of active initiators for ROP of cyclic esters

Dalton Transactions, 2017

New heteroleptic zinc dimeric complexes bearing an aminophenolate ligand of a single-site initiat... more New heteroleptic zinc dimeric complexes bearing an aminophenolate ligand of a single-site initiator framework were synthesized and characterized by spectroscopic methods, X-ray analysis, and DFT calculations.

Research paper thumbnail of CCDC 1495735: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of Low‐valent Mg(I) complexes by ball‐milling

Zeitschrift für anorganische und allgemeine Chemie

Research paper thumbnail of CCDC 1842072: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of CCDC 1982026: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1525786: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of Access to a Labile Monomeric Magnesium Radical by Ball‐Milling

Angewandte Chemie International Edition, 2022

In order to isolate a monometallic Mg radical, the precursor (Am)MgI·(CAAC) ( 1 ) was prepared (A... more In order to isolate a monometallic Mg radical, the precursor (Am)MgI·(CAAC) ( 1 ) was prepared (Am = t BuC(N-DIPP) 2 , DIPP = 2,6-diisopropylphenyl, CAAC = cyclic (alkyl)(amino)carbene). Reduction of a solution of 1 in toluene with the reducing agent K/KI led to formation of a deep purple complex that rapidly decomposed. Ball-milling of 1 with K/KI gave the low-valent Mg(I) complex (Am)Mg·(CAAC) ( 2 ) which after rapid extraction with pentane and crystallization was isolated in 15% yield. Although a benzene solution of 2 decomposes rapidly to give Mg(Am) 2 ( 3 ) and unidentified products, the radical is stable in the solid state. Its crystal structure shows planar trigonal coordination at Mg. The extremely short Mg-C distance of 2.056(2) Å indicates strong Mg-CAAC bonding. Calculations and EPR measurements show that most of the spin density is in a p* orbital located at the C-N bond in CAAC, leading to significant C-N bond elongation. This is supported by calculated NPA charges in 2 : Mg +1.73, CAAC -0.82. Similar metal-to-CAAC charge transfer was calculated for M 0 (CAAC) 2 and [M I (CAAC) 2 + ] (M = Be, Mg, Ca) complexes in which the metal charges range from +1.50 to +1.70. Although the spin density of the radical is mainly located at the CAAC ligand, complex 2 reacts as a low-valent Mg(I) complex: reaction with a I 2 solution in toluene gave (Am)MgI·(CAAC) ( 1 ) as the major product.

Research paper thumbnail of CCDC 1814491: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of CCDC 1860484: Experimental Crystal Structure Determination

Research paper thumbnail of Tigecycline Absorption Improved by Selected Excipients

Pharmaceuticals

To investigate the effects of (2,6-di-O-methyl)-β-cyclodextrin (DM-β-CD), (2-hydroxypropyl)-β-cyc... more To investigate the effects of (2,6-di-O-methyl)-β-cyclodextrin (DM-β-CD), (2-hydroxypropyl)-β-cyclodextrin (HP-β-CD), tocopherol polyethylene glycol 1000 succinate (TPGS), sodium desoxycholate (SDOCH), trimethyl chitosan (TMC), and sodium caprate (C10) on the plasma concentration and the oral bioavailability of tigecycline in broiler chickens. To test the effects of the excipients on absorption of tigecycline, a tetracycline that is poorly absorbed from the gastrointestinal tract, broiler chickens were used as an animal model. Tigecycline (10 mg/kg body weight) was administered intravenously, orally, and orally with one of the excipients. Plasma samples were taken after administration. To measure tigecycline concentrations, high-performance liquid chromatography coupled with tandem mass spectrometry was used. Compartmental and non-compartmental analyses were used for pharmacokinetic analyses of mean plasma concentrations versus time. With the exception of sodium caprate, all the exc...

Research paper thumbnail of Sodium complexes as precise tools for cutting polymer chains. Exploration of PLA degradation by unique cooperation of sodium centers

Inorganic Chemistry Frontiers

The challenge for the future of plastics is closed-loop plastic recycling and polymer waste degra... more The challenge for the future of plastics is closed-loop plastic recycling and polymer waste degradation. The exploration of the structural nuances of the sodium compounds presented in this paper shows how to design “tools for cutting polymer chains”.

Research paper thumbnail of Alkaline‐Earth Metal Mediated Benzene‐to‐Biphenyl Coupling

Angewandte Chemie International Edition

Complex [(DIPePBDI)Ca]2(C6H6), with a C6H62− dianion bridging two Ca2+ ions, reacts with benzene ... more Complex [(DIPePBDI)Ca]2(C6H6), with a C6H62− dianion bridging two Ca2+ ions, reacts with benzene to yield [(DIPePBDI)Ca]2(biphenyl) with a bridging biphenyl2− dianion (DIPePBDI=HC[C(Me)N‐DIPeP]2; DIPeP=2,6‐CH(Et)2‐phenyl). The biphenyl complex was also prepared by reacting [(DIPePBDI)Ca]2(C6H6) with biphenyl or by reduction of [(DIPePBDI)CaI]2 with KC8 in presence of biphenyl. Benzene‐benzene coupling was also observed when the deep purple product of ball‐milling [(DIPPBDI)CaI(THF)]2 with K/KI was extracted with benzene (DIPP=2,6‐CH(Me)2‐phenyl) giving crystalline [(DIPPBDI)Ca(THF)]2(biphenyl) (52 % yield). Reduction of [(DIPePBDI)SrI]2 with KC8 gave highly labile [(DIPePBDI)Sr]2(C6H6) as a black powder (61 % yield) which reacts rapidly and selectively with benzene to [(DIPePBDI)Sr]2(biphenyl). DFT calculations show that the most likely route for biphenyl formation is a pathway in which the C6H62− dianion attacks neutral benzene. This is facilitated by metal‐benzene coordination.

Research paper thumbnail of CCDC 1982025: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1961592: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1961591: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1525787: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of CCDC 1860480: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1495736: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of CCDC 1547955: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1835932: Experimental Crystal Structure Determination

Research paper thumbnail of DFT calculations as a ligand toolbox for the synthesis of active initiators for ROP of cyclic esters

Dalton Transactions, 2017

New heteroleptic zinc dimeric complexes bearing an aminophenolate ligand of a single-site initiat... more New heteroleptic zinc dimeric complexes bearing an aminophenolate ligand of a single-site initiator framework were synthesized and characterized by spectroscopic methods, X-ray analysis, and DFT calculations.

Research paper thumbnail of CCDC 1495735: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of Low‐valent Mg(I) complexes by ball‐milling

Zeitschrift für anorganische und allgemeine Chemie

Research paper thumbnail of CCDC 1842072: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of CCDC 1982026: Experimental Crystal Structure Determination

Research paper thumbnail of CCDC 1525786: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of Access to a Labile Monomeric Magnesium Radical by Ball‐Milling

Angewandte Chemie International Edition, 2022

In order to isolate a monometallic Mg radical, the precursor (Am)MgI·(CAAC) ( 1 ) was prepared (A... more In order to isolate a monometallic Mg radical, the precursor (Am)MgI·(CAAC) ( 1 ) was prepared (Am = t BuC(N-DIPP) 2 , DIPP = 2,6-diisopropylphenyl, CAAC = cyclic (alkyl)(amino)carbene). Reduction of a solution of 1 in toluene with the reducing agent K/KI led to formation of a deep purple complex that rapidly decomposed. Ball-milling of 1 with K/KI gave the low-valent Mg(I) complex (Am)Mg·(CAAC) ( 2 ) which after rapid extraction with pentane and crystallization was isolated in 15% yield. Although a benzene solution of 2 decomposes rapidly to give Mg(Am) 2 ( 3 ) and unidentified products, the radical is stable in the solid state. Its crystal structure shows planar trigonal coordination at Mg. The extremely short Mg-C distance of 2.056(2) Å indicates strong Mg-CAAC bonding. Calculations and EPR measurements show that most of the spin density is in a p* orbital located at the C-N bond in CAAC, leading to significant C-N bond elongation. This is supported by calculated NPA charges in 2 : Mg +1.73, CAAC -0.82. Similar metal-to-CAAC charge transfer was calculated for M 0 (CAAC) 2 and [M I (CAAC) 2 + ] (M = Be, Mg, Ca) complexes in which the metal charges range from +1.50 to +1.70. Although the spin density of the radical is mainly located at the CAAC ligand, complex 2 reacts as a low-valent Mg(I) complex: reaction with a I 2 solution in toluene gave (Am)MgI·(CAAC) ( 1 ) as the major product.

Research paper thumbnail of CCDC 1814491: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Research paper thumbnail of CCDC 1860484: Experimental Crystal Structure Determination