Crystal architecture and magnetic properties of four transition-metal adipate coordination polymers

Abstract

The crystal structures have been determined and the magnetic properties investigated for four novel] n 4 the combination of the metal cation with the dicarboxylate ligand leads to the formation of infinitive chains; still the co-ordinated water molecules and the carboxylate oxygen atoms collaborate to hydrogen-bond the chains into 3-D structures. Each cadmium() and nickel() ion in 1 and 4 is coordinated in an octahedral geometry to carboxylate and water molecules. The coordination sphere around copper() ions in 2 is square planar. The structure of 3, [Cu 3 (A) 2 (OH) 2 (H 2 O) 4 ] n , is made up of ribbons linked to neighboring ones by hydrogen bonds. Each ribbon is composed of 2 crystallographically independent metal centers, Cu(1) and Cu(2), which exhibit octahedral and square pyramidal coordination geometries, respectively. Weak antiferromagnetic interactions were observed for 2, and 3 (singlet-triplet energy gap values of Ϫ2.3 and Ϫ54.5 cm Ϫ1 , respectively) and isolated nickel() ions for 4. An interpretation of the magnetic behavior was attempted. The strategy for the assembly of 1-D metal-organic chains into 3-D structures, with the use of coordinated water molecules as hydrogen bond donors and carboxylate oxygens as hydrogen bond acceptors, is also discussed.

Synthesis, Metal Ions Coordination, Antimicrobial Activity of Some L-Tartaric Acid Derivatives

“…While L3-M complexes showed shifting in absorption maxima from 288 nm, 342 nm and 379 nm (L3) to 503 nm (for L3-Fe), 569 nm (L3-Ni) and 413 nm (for L3-Cu) as shown in Table 1. These results are in accord with reported observations of great affinity of ions Ni and Cu to form complexes with nitrogen, oxygen and sulphur atoms 29 . All complexes displayed strong peaks between 300→570 nm due to charge transfere and inter ligand electronic transition.…”

1D Chain Crystal Structure of Copper(II) Oxalate Containing a 4,4'-Bipyridine and 1,10-Phenanthroline Ligands: [Cu2(ox)(4,4'-bpy)(phen)2](NO3)2

“…[7][8][9][10] Multi-carboxylates as important flexible spacer ligands have also been used to form metal-organic frameworks (MOF), due to their conformational and coordination versatility. [11][12][13] We have been pursuing synthetic strategies for the preparation of non-interpenetrating open frameworks with variable cavities or channels, in which rod-like rigid spacers such as 4,4'-bpy and related species are chosen as building blocks. [14][15][16] One of our research interests has focused on a systematic study of the discrete polynuclear transition metal(II) compounds with aliphatic dicarboxylates.…”

Rational Design, Synthesis and Crystal Structure Investigation of Hydrogen‐Bonded Coordination Polymers of Bicyclic Bis‐Lactam Dicarboxylates

“…ganic layer is dictated solely by the nature of the metal cation (compare ref. [23] shown in Table 2. The observed distances are not unusual, with the shortest being found in the cases of the Co complexes 3 and 7.…”