Di-μ-acetato-κ⁴O:O′-μ-oxido-κ²O:O-bis[(acetic acid-κO)bis(1H-imidazole-κN³)magnesium(II)]

Abstract

Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.012 Å; R factor = 0.071; wR factor = 0.147; data-to-parameter ratio = 7.2.Magnesium acetate crystallizes upon reaction with imidazole in dimethylformamide at elevated temperatures to form the title magnesium acetate imidazole cluster species,with two Mg atoms in octahedral coordination. The complex has crystallographic twofold rotation symmetry. Each Mg atom is coordinated by two imidazole ligands, two linking acetate bridging ligands, a terminal acetic acid ligand, and a bridging O atom lying on the symmetry axis. ] M r = 575.14 Orthorhombic, Aba2 a = 8.6927 (14) Å b = 19.106 (3) Å c = 16.834 (3) Å V = 2795.8 (8) Å 3 Z = 4 Mo K radiation = 0.15 mm À1 T = 298 (2) K 0.12 Â 0.10 Â 0.05 mm Data collection Bruker SMART APEX diffractometer Absorption correction: multi-scan (SADABS; Bruker, 2004) T min = 0.986, T max = 0.994 10414 measured reflections 1287 independent reflections 1034 reflections with I > 2(I) R int = 0.112

2,2′-Dimethyl-7,7′-(methylenediimino)di-1,8-naphthyridin-1-ium bis(perchlorate)

“…Juan Mo, Jian-Hua Liu, Yu-Shan Pan, Su-Mei Zhang and Xiang-Dang Du S1. Comment 1,8-Naphthyridine and its derivatives are used for binding of mismatched guanine or used as versatile ligands which are able to form metal aggregates with monodentates fashion or chelating bidentate fashion (Nakatani et al, 2000;Nakatani et al, 2001;Ferrarini et al, 1997;Gavrilova & Bosnich, 2004;Baker & Norman, 2004;Stadie et al, 2007). We report here a new 1,8-Naphthyridine compound (Fig.…”

Hexa-μ2-acetato-1:2κ4 O:O′;1:2κ2 O:O;2:3κ4 O:O′;2:3κ2 O:O-bis(2-amino-7-chloro-5-methyl-1,8-naphthyridine)-1κN 1,3κN 1-trizinc(II)

“…(2008). E64, m1128 Acetic acid is versatile ligand which can function in monodentate or bidentate modes in metal complexes (Baker & Norman, 2004;Lis et al, 2005;Stadie et al, 2007). Here, we report the crystal structure of the title compound, (I), in which three Zn II ions are bridged by three acetic acid ligands.…”

“…For related literature, see: Baker & Norman (2004); Lis et al (2005); Stadie et al (2007). T = 113 (2) K 0.12 Â 0.08 Â 0.02 mm…”

Structure of Sonic Hedgehog protein in complex with zinc(II) and magnesium(II) reveals ion-coordination plasticity relevant to peptide drug design

“…The presence of mixed-occupancy Zn 2+ /Mg 2+ at the Zn 2+ site of Shh-N best explains the observed octahedral coordination geometry and electron density. Precedents for octahedral Mg 2+ coordinated by carboxylate and imidazole ligands come from small-molecule structures (Gryz et al, 2007;Stadie et al, 2007;Liu & Liu, 2010;Ye et al, 1998;Srinivasan et al, 2007). Likewise, small-molecule examples are available for octahedral Zn 2+ coordination arising from two imidazole and two carboxylate ligands (Carballo et al, 2004;Li et al, 2014;Shimizu et al, 2004).…”