Naslov
Chemistry of 1,3-Dioxepins. XIV. Structural Studies of 4,7-Dihydro-(4,7-dihydro-1,3-dioxepin-2-yl)-1,3-dioxepin and Their Metal Complexes
(Chemistry of 1,3-Dioxepins. XIV.1 Structural Studies of 4,7-Dihydro-(4,7-dihydro-1,3-dioxepin-2-yl)-1,3-dioxepin and Their Metal Complexes)

Autori
Matak-Vinković, Dijana ; Vinković, Mladen ; Dumić, Miljenko

Izvornik
Croatica Chemica Acta (0011-1643) 72 (1999), 2-3;

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
X-ray; 1;3-dioxepin; conformation

Sažetak
The coordination properties and conformational behaviour of 4,7-dihydro-(4,7-dihydro-1,3-dioxepin-2-yl)-1,3-dioxepin [1, bis-(1,3-dioxepin), or C10H14O4] were investigated. The crystal and molecular structures of bis-(1,3-dioxepin) (1), bis-(1,3-dioxepin) lithium-perchlorate (2:1) (2) and bis-(1,3-dioxepin) sodium-perchlorate (1:1) (3) complexes, as well as bis-(1,3-dioxepin) hexsaaquomagnesium-perchlorate (3:1) chlatrate (4), have been determined by X-ray diffraction. . The molecule of bis-(1,3-dioxepin) is bidentate ligand in mononuclear lithium complex 2, in contrast to its bridging mode in 2D polymeric sodium complex 3. The coordination environment around lithium in 2 is distorted octahedral with C2 symmetry, while around sodium in 3 is quasi-pentagonal bipyramidal. Out of four possible conformations of bis-(1,3-dioxepin) molecule, twist-boat-twist-boat centrosymmetric (tb-tb-c), twist-boat-twist-boat non-centrosymmetric (tb-tb), twist-boat-chair (tb-ch) and chair-chair (ch-ch), three of them are found in investigated crystal structures: ch-ch in 1, tb-tb in 2 and tb-tb-c in 3 and 4.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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