NDLI: 2D and 3D coordination polymers based on 2,2′-bipyrimidine and cyanide bridging ligands incorporating coordinated and guest ammonia molecules. Synthesis, crystal structures, magnetic properties and thermal analysis of {[Ni(CN)4]2[(Ni(NH3)2)2(bpym)]·2H2O}n and {[Cu2(CN)2(bpym)]·NH3}n

Content Provider	Royal Society of Chemistry (RSC)
Author	Lloret, Francesc Suarez-Varela, José Romerosa, Antonio Stoeckli-Evans, Helen Colacio, Enrique Navarrete, Miguel
Copyright Year	2005
Abstract	The coordination polymers {[Ni(CN)4]2[(Ni(NH3)2)2(bpym)]·2H2O}n1 and {[Cu2(CN)2(bpym)]·NH3}n2 have been prepared from the reactions of M(NO3)2·nH2O [Cu(II), n = 3 and M = Ni(II), n = 6] with NaCN and bpym (2,2′-bipyrimidine) in concentrated aqueous ammonia, respectively. The structure of 1 is made of bipyrimidine bridged centrosymmetric dinuclear [Ni(NH3)2(μ-bpym)Ni(NH3)2] fragments connected by four [Ni(CN)4]2− anions giving rise to a 2D framework. Layers, which adopt a stair-like conformation, are stacked with an ABAB… repeat pattern. Water molecules are located in the interlayer space and are involved in hydrogen bond interactions with the non-bridging cyanide groups of the [Ni(CN)4]2− anions and one of the ammonia molecules. Magnetic measurements clearly show the existence of antiferromagnetic exchange interactions between the local spin triplet states of the octahedral Ni(II) ions mainly mediated by the bpym exchange pathway with a J value of −16.82 cm−1. The structure of 2 consists of [Cu2(bpym)] centrosymmetric fragments connected by cyanide groups to four neighbouring Cu(I) ions giving rise to a 3D network with channels perpendicular to the bc plane. Guest ammonia molecules are located into channels. TG-XRD combined studies show that the structure of 1 is retained after dehydration whereas that of 2, however, collapses after ammonia elimination.
Starting Page	1189
Ending Page	1194
Page Count	6
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	29
Issue Number	9
Journal	New Journal of Chemistry
DOI	10.1039/b507136d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Antiferromagnetism Ammonia Cyanide Triplet state Chemical structure Dehydration reaction Hydrogen bond Three-dimensional space
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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