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Syntheses, Crystal Structures and Magnetism of Three Metal–Dicyanamide Coordination Polymers with Isonicotinamide Co‐Ligand
Author(s) -
Zheng LingLing,
Zhuang XiaoMei
Publication year - 2010
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201000116
Subject(s) - dicyanamide , crystallography , supramolecular chemistry , chemistry , hydrogen bond , ligand (biochemistry) , isonicotinamide , coordination polymer , oxamide , crystal structure , antiferromagnetism , metal , octahedron , molecule , stereochemistry , ionic liquid , organic chemistry , biochemistry , receptor , physics , condensed matter physics , catalysis
Three metal–dicyanamide (dca) coordination polymers combined with isonicotinamide (4‐nic) terminal co‐ligand, namely, [Mn(dca) 2 (4‐nic) 2 ] n ( 1 ), [Co(dca) 2 (4‐nic) 2 ] n · 2 n CH 3 OH ( 2 ) and [Mn(dca) 2 (4‐nic) 2 ] n ( 3 ) were synthesized at room temperature. X‐ray single crystal diffraction reveals that complexes 1 and 2 have similar one‐dimensional metal–dca coordination chains in which the octahedral metal atoms are connected by double μ 1,5 ‐dca bridges. Whereas compound 3 is a two‐dimensional coordination layer in which the metal atoms are linked by single μ 1,5 ‐dca bridge. The coordination chains of 1 and 2 are further cross‐linked by N–H ··· N hydrogen bonding interactions between the uncoordinated nitrogen atom of dca and a hydrogen atom from the CONH 2 group to create a 2D supramolecular layer. For 2 , the N–H ··· O, O–H ··· O hydrogen‐bonding interactions between CH 3 OH molecules and CONH 2 groups extend the 2D layers into a three‐dimensional network. The 2D layers of 3 are further connected by N–H ··· O, C–H ··· O hydrogen bonds between CONH 2 groups, N–H ··· N interactions from CONH 2 groups and a nitrile nitrogen atom of dca to give a 3D supramolecular architecture. Magnetic studies reveal that weak antiferromagnetic exchanges exist between the metal atoms in 2 and 3 ( J = –0.27 cm –1 , g = 1.99). The thermal stability of 2 is also discussed.