NDLI: Anion binding by metallo-receptors of 5,5′-dicarbamate-2,2′-bipyridine ligands

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Anion binding by metallo-receptors of 5,5′-dicarbamate-2,2′-bipyridine ligands

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Anion binding by metallo-receptors of 5,5′-dicarbamate-2,2′-bipyridine ligands

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Wu, Biao Huang, Xiaojuan Yang, Jin Janiak, Christoph Yang, Xiao-juan Tang, Ning Li, Shaoguang Jia, Chuandong
Description	Author Affiliation: Wu B ( Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, 710069, China. wubiao@nwu.edu.cn)
Abstract	Three 5,5′-dicarbamate-2,2′-bipyridine ligands (L = $L^{1}–L^{3})$ bearing ethyl , isopropyl or tert-butyl terminals, respectively, on the carbamate substituents were synthesized. Reaction of the ligands L with the transition metal ions M = Fe $^{2+}$ , Cu $^{2+}$ , Zn $^{2+}$ or Ru $^{2+}$ gave the complexes $ML_{n}X_{2}·xG$ (1–12, n = 1–3; X = Cl , NO $_{3}$ , ClO $_{4}$ , BF $_{4}$ , PF $_{6}$ , ½SO $_{4}$ ; G = Et $_{2}O$ , DMSO , CH $_{3}OH$ , H $_{2}O$ ), of which [ Fe(L $^{2})$ $_{3}$ $⊃SO_{4}]·8.5H_{2}O$ (2), [ Fe(L $^{1})$ $_{3}$ $⊃(BF_{4})_{2}]·2CH_{3}OH$ (7), [ Fe(L $^{2})$ $_{3}$ $⊃(Et_{2}O)_{2}](BF_{4})_{2}·2CH_{3}OH$ (8), $[ZnCl_{2}(L^{1})][ZnCl_{2}(L^{1})(DMSO)]·2DMSO$ (9), [ Zn(L $^{1})$ $_{3}$ $⊃(NO_{3})_{2}]·2H_{2}O$ (10), [ Zn(L $^{2})$ $_{3}$ $⊃(ClO_{4})(Et_{2}O)]ClO_{4}·Et_{2}O·2CH_{3}OH·1.5H_{2}O$ (11), and $[Cu(L^{1})_{2}(DMSO)](ClO_{4})_{2}·2DMSO$ (12) were elucidated by single-crystal X-ray crystallography . In the complexes $ML_{n}X_{2}·xG$ the metal ion is coordinated by n = 1, 2 or 3 chelating bipyridine moieties (with other anionic or solvent ligands for n = 1 and 2) depending on the transition metal and reaction conditions. Interestingly, the carbamate functionalities are involved in hydrogen bonding with various guests (anions or solvents ), especially in the tris(chelate) complexes which feature the well-organized $C_{3}-clefts$ for effective guest inclusion. Moreover, the anion binding behavior of the pre-organized tris(chelate) complexes was investigated in solution by fluorescence titration using the emissive [RuL $_{3}]$ $^{2+}$ moiety as a probe . The results show that fluorescent recognition of anion in solution can be achieved by the Ru $^{II}$ complexes which exhibit good selectivities for SO $_{4}$ $^{2}$ $^{−}.$
ISSN	14779226
Issue Number	21
Volume Number	40
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2011-06-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	2,2'-Dipyridyl Analogs & Derivatives Anions Chemistry Carbamates Coordination Complexes Crystallography, X-Ray Ligands Magnetic Resonance Spectroscopy Molecular Conformation Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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