Meten in de praktijk

Beurskens, Sandra; Peppen, Roland van; Stutterheim, Eric; Swinkels, Raymond; Wittink, Harriët

doi:10.1007/978-90-313-6557-9

Cited by 15 publications

(1 citation statement)

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“…The solution, refinement and analysis of the single crystal X-ray diffraction data was performed with wingx suite for small molecule single-crystal crystallography [24] . The structures were solved by Patterson methods with dirdif99 [25] (6b and 14b), or direct methods with shelxs-97 [27] (9b and 11) or sir2002 [26] (7b), and refined by full-matrix least-squares methods on F 2 with shelx97 [27] . The hydrogen atoms were included in calculated positions and refined by using a riding mode.…”

Section: X-ray Crystallographymentioning

confidence: 99%

Binuclear Co(II), Ni(II), Cu(II) and Zn(II) complexes with Schiff-bases derived from crown ether platforms: Rare examples of ether oxygen atoms bridging metal centers

et al. 2010

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Bibracchial lariat ethers L 3 and L 4 , derived from the condensation of N, N′-bis(2-aminobenzyl)-1,10-diaza-15-crown-5 or N,N′-bis(2-aminobenzyl)-4,13-diaza-18-crown-6 with salicylaldehyde, form binuclear complexes with Co(II), Ni(II), Cu(II) and Zn(II). Our studies show that the different denticity and crown moiety size of the two related receptors give rise to important differences on the structures of the corresponding complexes. Single crystal X-ray diffraction analysis shows that the [Ni2(L 3 )(H2O)2] 2+ and [Cu2(L 3 )(NO3)] + complexes constitute a rare example in which an oxygen atom of the crown moiety is bridging the two six coordinate metal ions. In contrast, none of the oxygen atoms of the crown moiety is acting as a bridging donor atom in the [Co2(L 4 )(CH3CN)2] 2+ , [Cu2(L 4 )] 2+ and [Zn2(L 4 )] 2+ complexes. This is attributed to the larger size the crown moiety and the higher denticity of L 4 compared to L 3 . In [Co2(L 4 )(CH3CN)2] 2+ the metal ions show a distorted octahedral coordination, while in the Cu(II) and Zn(II) analogues the metal ions are five-coordinated in a distorted trigonal bipyramidal environment. In [Cu2(L 3 )(NO3)] + the coordinated nitrate anion acts as a bidentate bridging ligand, which results in the formation of a 1D coordination polymer.

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Section: X-ray Crystallographymentioning

confidence: 99%