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1

New Polymorphic Form of 1,4-Bis(3-pyridyl)-2,3-diaza-1,3-butadiene

Ciunik Z., Drabent K.

Polish Journal of Chemistry

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2007

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Vol. 81, nr 5-6

1007-1010

2

Magnetic Interactions in Cu(pyridine-2-carboxylate)2

Żurowska B., Mroziński J., Ciunik Z.

Polish Journal of Chemistry

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2007

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Vol. 81, nr 3

403-410

EN

The magnetic properties of the compound of the formula Cu(2-pca)2, (2-pca = 2-picolinate ion) were studied in the light of its known X-ray structure. The crystal structure consists of a copper atom lying in the centre of symmetry, trans square-planar coordinated via two pyridine nitrogens and the carboxylate oxygen atoms of the two picolinate anions. The crystal packing is due to short pi-pi stacking interactions between pyridine rings belonging to different molecules giving rise to a one-dimensional polymeric network arrangement. Additional CH-O hydrogen bonds form a three-dimensional polymeric network. The variable-temperature (1.8-300 K) magnetic susceptibility data of the complex were interpreted with the Bonner-Fisher expression with molecular field approximation, yielding J, zJ' and g values of -0.76, -0.47 cm-1, 2.09, respectively. The magnitude of the magnetic interaction through the pi-pi stacking interaction and hydrogen bond, and the nature of the exchange coupling is discussed on the basis of the structural data results.

3

Lactones 18. Synthesis of Bicyclic Lactones with Methyl-, Di- and Trimethyl Substituted Cyclohexane System

Grabarczyk M., Szumny A., Gładkowski W., Białoński A., Ciunik Z., Wawrzeńczyk C.

Polish Journal of Chemistry

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2005

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Vol. 79 / nr 11

1763-1771

4

Lactones 17. Synthesis of Bicyclic Lactones with the Methyl- or gem-Dimethylcyclopropane System

Obara R., Szumny A., Żołnierczyk A., Olejniczak T., Białońska A., Ciunik Z., Wawrzeńczyk C.

Polish Journal of Chemistry

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2005

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Vol. 79 / nr 6

981-993

EN

A new method of synthesis of bicyclic gamma-lactones with the methyl- or gem-dimethylcyclopropane system from gamma,delta unsaturated esters is described. The reaction of gamma-halo delta- lactones with DBU is the key step of this synthesis. The mechanism of the dehydrohalogenation- cyclization process of gamma-halo-delta-lactones is proposed. The structures of products were confirmed by both spectroscopic and crystallographic methods.

5

Coordination behaviour of N,N'-diallylpiperazinium(+2) and N-allylhexamethylenetetraminium in their crystalline pi-complexes with ionic copper(I) salts

Shkurenko O., Kinzhybalo V., Lis T., Ciunik Z., Myskiv M.

Materials Science Poland

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2005

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Vol. 23, No. 3

743--756

EN

This brief review discusses the coordination behaviour of π-coordinated copper(I) in the structures of [Cu2(μ-dapp)(NH2SO3)4]·2H2O (1), [C4H12N2][Cu2(μ-dapp)(NH2SO3)6]·2H2O (2), [Cu2(μ-dapp)(H2O)6] (SiF6)2·2H2O (3), [Cu2(μ-dapp)(NO3)4(H2O)2]·2H2O (4), [Cu(μ-ahmta)(NO3)(H2O)](NO3)·H2O (5), and [Cu(μ-ahmta)(H2O)2](BF4)2·H2O (6) complexes (dapp = N,N′-diallylpiperazinium(2+), ahmta = N-allylhexamethylenetetraminium), obtained as single crystals by means of an alternating current electrochemical technique. The above π-complexes are formed respectively by CuSO3NH2, Cu2SiF6, CuNO3, and CuBF4 salts, unknown in a free state.

6

The C-H...[FBF3}-Hydrogen Bonds as Origin of the Linear Polytetrameric Self-Organisation of Schiff Base Containing Substituted 1,2,4-Triazole

Ciunik Z.

Polish Journal of Chemistry

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2001

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Vol. 75, nr 10

1475-1482

EN

The first crystal structure involving Schiff base containing 4-substituted 1,2,4-triazolium cation is reported. The neutral (4-chloro-benzylidene)-[1,2,4] triazol-4-yl-amine (T) and protonated (HT+) molecules are connected by the strong [N-H...N]+ hydrogen bond forming the discrete dimers. The pair of the dimers and two BF4 _ ions are linked via the weak C-H...F interactions and create tetrameric units. BF4 _ ions mediate between succeeding tetramers and as a result double ribbons along [110] are formed. No intermolecular, directional interactions between neighbour ribbons in the crystal were found.

7

Lactones 5 : Synthesis of Some terpenoid Lactones from G,D-Epoxy Esters

Olejniczak T., Nawrot J., Ciunik Z., Wawrzeńczyk C.

Polish Journal of Chemistry

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2000

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Vol. 74, nr 5

673-680

EN

D-Hydroxy-G-lactones and G-hydroxy-D-lactones were synthesized from acyclic isoprenoid G,D-epoxy esters in acid induced lactonization. The reaction course was depended on the acidic agent applied. The mechanism of lactonization is presented.

8

Crystal Structure of Molecular Complex (R)-(+)-3-Cyclohexene-1-carboxylic Acid with Brucine

Krajewski K., Ciunik Z.

Polish Journal of Chemistry

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1999

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Vol. 73, nr 10

1687-1696

EN

The 3-cyclohexene-1-carboxylic acid was prepared and resolved with brucine. Absolute configuration of (R)-(+)-3-cyclohexene-1-carboxylic acid was confirmed by X-ray diffraction methods.

9

Reactivity and crystal structure of 1,2:3,4:5,6-Tri-O-isopropylidene-D-gluconolactone

Jarosz S., Ciunik Z.

Polish Journal of Chemistry

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1998

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Vol. 72, nr 7

1182-1190

EN

1,2:3,4,5,6-Tri-O-isopropylidene-D-gluconate (1) undergoes the beta-elimination reaction in the presence of LDA to afford 3-deoxy-1,2:5,6-di-O-isopropylidene-D-erythro-hex-3-enolactone (6). Attempts to prepare the phosphonate 4 by reaction of 1 with dimethyl methylphosphonate in the presence of LDA failed; only elimination product 6 was isolated from the reaction mixture. The sugar phosphonate 8 (protected form of 4) was prepared from methyl 2-O-benzyl-3,4:5,6-di-O-isopropylidene gluconate (7) by reaction with (-)CH2P(O)(OMe)2. The crystal structure of 1 is reported.