The crystal structure of zinc 8-hydroxyquinolinate dihydrate

Abstract

The crystal structure of zinc 8-hydroxyquinolinate dihydrate, Zn(C~H6ON)~. 2H~O, has been determined by single-crystal methods. The unit cell is monoclinic with a = 11.28, b = 5.42, c = 13.16 A, fl = 106 ° 18'. The space group is P21/a-C~a and there are two molecules per unit cell.Atomic positions were determined by electron-density projections and were refined by a threedimensional Fourier electron-density synthesis and by the method of least squares. Structure factors were obtained from visually estimated intensities on Weissenberg photographs taken with Cu Kc~ radiation.The molecule, with the exception of the water molecules, is essentially planar. Including the water molecules, there is a sort of distorted octahedral arrangement of bonds around the central zinc ion.Zn-O = 2.05 A, Zn-N = 2.06/~, Zn-OH 2 ----2.27 /~.

The crystal structure of zinc salicylate dihydrate

“…Hargreaves (1957) found Zn-O distances of 2.05, 2.08, and 2.14 A in the nearly regular octahedron of 6 H~O about zinc in zinc p-toluene sulfonate hexahydrate. Merritt, Cady & Mundy (1954) found two Zn-O distances of 2.05 and 2.27 J~ and two Zn-N distances of 2.06/~ in zinc 8-hydroxyquinolate dihydrate. Finally, in zinc acetate dihydrate distances of 2.14, 2.17, and 2.18 • were found in the badly distorted Zn-O octahedron ( van Niekerk, Schoening & Talbot, 1953).…”

“…It might have been expected that these remaining carboxyl group oxygens would have been pulled into the zinc coordination sphere with hybridized 4s, 4p 3, 4d 2 octahedral coordination, as was suggested by Merritt et al (1954) for zinc 8-hydroxyquinolate dihydrate. However, the relative instability of the 4d orbitals is well known, and they seem to have lost out in the competition with the hydrogen bonds of the structure.…”

Ligation of Bipyridyl Ligands to Metal 8‐Hydroxyquinolinates – Synthesis, Crystal Structures, and TDDFT Study

“…The Mq 2 structure was employed directly from reported crystal structure. [11,13] The electron-density diagrams of molecular orbitals were obtained with the Gaussview graphics program. 266 g, 1 mmol), and whilst stirring HQ (2 mmol) was slowly added to the mixture.…”

“…[5][6][7][8][9][10][11] Consequently, the structure-device property correlation of Znq 2 (q = 8-hydroxyquinoline) has been widely reported. [12][13][14][15][16] A discussion of the interfacial effect of polypyridyl compounds and metal [ …”

Investigation of Distribution of Cupric Ion in Various Metal Oxinates by Electron Paramagnetic Resonance.

“…However, many metal oxinates are isostructural with Cu-oxinate, with similar lattice parameters (7)(8)(9). An x-ray analysis in such a case is obviously difficult.…”