NDLI: Luminescent imidazolium carboxylate supported aggregate and infinite coordination networks of copper and zinc

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Prabusankar, Ganesan Sathyanarayana, Arruri Suresh, Paladugu Sampath, Natarajan Radhakrishnan, Soumya Naga Babu, Chatla
Description	Author Affiliation: Suresh P ( Department of Chemistry, Indian Institute of Technology Hyderabad, ODF Estate, Yeddumailaram, AP 502 205, India.)
Abstract	The new copper dimer $[LCu(DMF)]_{2}(NO_{3})_{4}(H_{2}O)(DMF)_{2}$ (4), where L = $[\{1,1′-(CH_{2})_{2}-C_{14}H_{8})-3,3′-(CH_{2}CO_{2})_{2}\}\{(HCN)_{2}CH\}],$ and porous coordination polymers $[\{L_{2}Cu(OH_{2})_{2}\}_{2}Br_{2}]_{x}$ (5) and $[\{L_{2}Zn(OH_{2})_{2}\}_{2}Br_{2}]_{x}$ (6) have been isolated from reactions of luminescent imidazolium carboxylate ligand , $LH_{2}Br_{2}$ (3) and the corresponding metal precursors. The reaction between $Cu(NO_{3})_{2}·3H_{2}O$ and $LH_{2}Br_{2}$ (3) in DMF at 100 °C yielded bluish green crystals of tetracationic discrete copper dimer 4, the structure of which contains a rare tetracationic $[(DMF)Cu(II)]_{2}$ dimer unit that is bridged by four carboxylates of two L in a “paddle-wheel” structure. When the reaction was carried out in the presence of a water– ethanol –methanol mixture, light green crystals of 5 were obtained. Molecule 5 comprises two-dimensional (2D) porous coordination polymeric sheets consisting of unique symmetrical dinuclear $[(C(O)O)Cu(OH_{2})_{2}(O(O)C)_{2}]_{2}$ building blocks, which are connected by imidazolium anthracene spacers. The infinite 2D porous coordination polymeric sheets are further linked by significant intermolecular hydrogen-bonding interactions by bromide anions to form a three-dimensional supramolecular framework. Interestingly, the reaction between zinc dust and $LH_{2}Br_{2}$ (3) in H $_{2}O$ at room temperature gave similar structural features to those in 5, though they differ in terms of C–O bond distances and M–O–C angles. The solution-state UV-visible absorption spectra of 2–6 in water exhibits the comparable absorption pattern with decrease in the intensity of absorption from 5, 4, 3, 6 and 2, while the solid-state UV-visible absorption spectra of 2–6 are significantly different from the solution-state UV-visible absorption spectra . The considerable change in the fluorescent emission was observed upon complexation of 3 with corresponding metal precursors and the fluorescent emission was shifted towards the red region in the order of 2, 3, 6, 4 and 5 in water .
ISSN	14779226
Issue Number	30
Journal	Dalton Trans.
Volume Number	42
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-08-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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