NDLI: Assembling metals $(Co^{II}$ and $Mn^{II})$ with pyridylcarboxylates in the presence of azide: synthesis, structural aspects and magnetic behavior of three coordination polymers

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mondal, Kartik Chandra Nethaji, Munirathinam Sengupta, Oindrila Mukherjee, Partha Sarathi
Description	Author Affiliation: Mondal KC ( Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India.)
Abstract	The reaction between $Co(NO_{3})_{2}·6H_{2}O$ and substituted pyridylcarboxylic acid [ nicotinic acid (Hnic) or trans-3-pyridylacrylic acid (Htpa)] in the presence of $NaN_{3}$ under hydrothermal conditions yielded $[Co_{1.5}(nic)_{2}$ $(Hnic)(N_{3})]_{n}$ (1) and $[Co_{1.5}(tpa)_{2}$ $(N_{3})(H_{2}O)]_{n}$ (2), respectively. Single crystal structure analyses reveal that both complexes are 3D complicated coordination polymers . The basic repeating units in both of the complexes are $Co_{3}$ trinuclear clusters containing syn–syn bridging carboxylate and end-on azido linker. A similar reaction using $MnCl_{2}·4H_{2}O$ in presence of equimolar amounts of Htpa and $NaN_{3}$ yielded a 2D corrugated sheet $[Mn(tpa)_{2}]_{n}$ (3) containing no azide. Complex 3 can also be synthesized under hydrothermal conditions using Natpa in the absence of $NaN_{3}.$ Surprisingly, the same reaction at room temperature yielded a known mononuclear complex $[Mn(tpa)_{2}(H_{2}O)_{4}].$ Variable temperature magnetic studies down to 2 K revealed the dominant antiferromagnetic nature of the first two complexes with a ferrimagnetic type of behavior despite the facts that they are homometallic and homospin systems. The susceptibility data in both cases were analyzed by a $Co_{3}$ trinuclear model as well as considering inter-trimer interactions. Complex 3 is weakly antiferromagnetic in nature with an exchange parameter of J = −2 $cm^{−1}$ through the syn–anti bridging carboxylate pathway.
ISSN	14779226
Journal	Dalton Trans.
Issue Number	6
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2008-02-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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