NDLI: Two novel heterometallic $Cu^{II}-Sr^{II}$ coordination polymers based on 3,5-pyrazoledicarboxylic acid : synthesis, crystal structures and magnetic properties

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Chen, Yanmei Zheng, Lina Li, Yahong Chen, Zhou Hu, Bin She, Shixiong
Description	Author Affiliation: Chen Y ( Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou, 215006, China.)
Abstract	The syntheses, crystal structures and magnetic properties are described for two novel 2D heterometallic $Cu^{II}-Sr^{II}$ coordination polymers $\{Sr(H_{2}O)_{6}[(Im)_{4}Cu_{4}(pdc)_{4}Sr(H_{2}O)_{4}]·6H_{2}O\}_{n}$ (1) and $[Cu_{2}(H_{2}O)_{2}(pdc)_{2}Sr(H_{2}O)_{3}]_{n}$ (2) $(H_{3}pdc$ = 3,5-pyrazoledicarboxylic acid ; Im = imidazole ). The 1:1:1:5 reaction of $SrCl_{2}·6H_{2}O,$ $Cu(NO_{3})_{2}·3H_{2}O,$ $H_{3}pdc$ and imidazole in H $_{2}O$ – EtOH at 120 °C under autogenous pressure gave 1. Complex 2 was obtained from the 1:1:1 $H_{3}pdc/Sr(OH)_{2}·8H_{2}O/Cu(NO_{3})_{2}·3H_{2}O$ reaction mixture in H $_{2}O$ – EtOH under solvothermal conditions. Complex 1 can be described as a 2D grid-shaped network with the four $Cu^{II}$ ions in a saddle-like conformation. In complex 2, $Sr^{II}$ ions link metalloligands $[Cu_{2}(pdc)_{2}(H_{2}O)_{2}]^{2−}$ to generate a 2D layer framework. Variable-temperature solid-state dc magnetic susceptibility studies have been performed in the temperature range 2.0–300 K for complexes 1 and 2. Antiferromagnetic $Cu^{II}⋯Cu^{II}$ exchange interactions were found for both 1 and 2.
ISSN	14779226
Issue Number	18
Journal	Dalton Trans.
Volume Number	40
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2011-05-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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