科研之友
微信
新浪微博
Facebook
分享链接
摘要
A series of six coordination compounds {[Zn(5-Brnic)(2)] center dot 1.5H(2)O}(n) (1), [Cd(5-Brnic)(2)](n) (2), [Co(5-Brnic)(2) (H2O)(2)](n) (3), [Zn(5-Brnic)(2)(H(2)biim)](n) (4), {[Cd(5-Brnic)(2)(phen)] center dot H2O}(n) (5), and [Pb(5-Brnic)(2)(phen)] (6) have been generated by the hydrothermal method from the metal(II) nitrates, 5-bromonicotinic acid (5-BrnicH), and an optional ancillary 1,10-phenanthroline (phen) or 2,2'-biimidazole (H2biim) ligand. All the products 1-6 have been characterized by IR spectroscopy, elemental, thermal, powder and single-crystal X-ray diffraction analyses. Their 5-bromonicotinate-driven structures vary from the 3D metal-organic framework with the seh-3,5-P21/c topology (in 2) and the 2D interdigitated layers with the sql topology (in 1 and 3), to the 1D chains (in 4 and 5) and the OD discrete monomers (in 6). The 5-bromonicotinate moiety acts as a versatile building block and its tethered bromine atom plays a key role in reinforcing and extending the structures into diverse 3D supramolecular networks via the various halogen bonding Br center dot center dot center dot O, Br center dot center dot center dot Br, and Br center dot center dot center dot pi interactions, as well as the N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds. The obtained results demonstrate a useful guideline toward engineering the supramolecular architectures in the coordination network assembly under the influence of various halogen bonding interactions. The luminescent (for 1, 2, 4, 5, and 6) and magnetic (for 3) properties have also been studied and discussed in detail.
- 出版日期2014-5
- 单位兰州大学; 功能有机分子化学国家重点实验室
