Homo- and Heteronuclear Architectures of Polynuclear Complexes Containing Anions of Substituted Malonic Acids: Synthetic Approaches and Analysis of Molecular and Crystal Structures

Barium(II)–Chromium(III) Coordination Polymers Based on Dimethylmalonate Anions: Synthesis, Crystal Structure, Magnetic Properties, and EPR Spectra

“…[5] Important features of malonic acid are the existence of its substituted analogs (H 2 R 1 R 2 mal) and the possibility of varying the substituent at the carbon atom that links two carboxyl groups, thereby making it possible to control the composition and structure of the resulting complexes. [6] The majority of chromium(III) malonate complexes published in the literature contain unsubstituted malonic acid anions as ligands, [7] whereas malonate complexes containing both Ba II and Cr III have been unknown to date. The goals of this work are to study the influence of the initial reagent ratio and the nature of the starting inorganic chromium(III) salt (nitrate or chloride) on the structure of the compounds that are generated by the reaction with dimethylmalonic acid (H 2 Me 2 mal) and its barium salt (Ba(Me 2 mal)) and to investigate the magnetic properties and EPR spectra of the synthesized complexes.…”

“…[ 5 ] Important features of malonic acid are the existence of its substituted analogs (H 2 R 1 R 2 mal) and the possibility of varying the substituent at the carbon atom that links two carboxyl groups, thereby making it possible to control the composition and structure of the resulting complexes. [ 6 ]…”

Synthesis, structure, magnetic properties and thermal behaviour of Ba–MII (MII = Mn, Co, Cu, and Zn) allylmalonates

“…Anions of malonic acid (malRR 0 ) and its substituted analogues tend to form bischelate anions [M(malRR 0 ) 2 X y ] 2À , where X = H 2 O, ROH, y = 0, 1, 2 in the absence of additional organic ligands. 10 Combining the [M(malRR 0 ) 2 X y ] 2À anion and an s-metal cation leads to the formation of polymeric compounds. Previously, the processes of thermal decomposition and formation of mixed oxide materials were studied for a number of substituted malonates It is known that the use of complex compounds as precursors simplifies the preparation of oxide materials with the required stoichiometry, in particular, by lowering the process temperature in comparison with classical methods of preparation from simple oxides.…”

Cobalt(II) Complexes Based on Benzylmalonate Anions Exhibiting Field-Induced Single-Ion Magnet Slow Relaxation Behavior

“…The anions of malonic acid and its substituted analogs can exhibit a chelating and/or bridging function in complexes with transition metal ions, and additionally act as conductors of exchange interactions between paramagnetic centers [20][21][22][23][24]. The literature describes Co II homometallic compounds with anions of malonic acid (H 2 mal) and its substituted analogs that have a mononuclear structure-[Co II (H 2 O) 2 (Hmal) 2 ] [25], (NH 4 ) 2 [(Co(H 2 O) 2 (mal) 2 ]•6H 2 O [26], [Co(H 2 O) 6 ](cpdc) 2 (cpdc 2− -cyclopropane-1,1-dicarboxylate dianions) [27]-and a polymer structure: [Co 2 (H 2 O) 4 (mal) 2 ] n [28][29][30], [Co 2 (mal) 2 Cl 2 (H 2 O) 2 ] n [31], [Co 2 (H 2 O) 3 (cbdc) 2 ] n (cbdc 2− -cyclobutane-1,1dicarboxylate dianions) [32], [Co 3 (tar) 2 (H 2 O) 6 ]•2H 2 O (tar 3− -tartronate anion or hydroxymalonic acid anion) [33].…”

“…The literature describes Co II homometallic compounds with anions of malonic acid (H 2 mal) and its substituted analogs that have a mononuclear structure-[Co II (H 2 O) 2 (Hmal) 2 ] [25], (NH 4 ) 2 [(Co(H 2 O) 2 (mal) 2 ]•6H 2 O [26], [Co(H 2 O) 6 ](cpdc) 2 (cpdc 2− -cyclopropane-1,1-dicarboxylate dianions) [27]-and a polymer structure: [Co 2 (H 2 O) 4 (mal) 2 ] n [28][29][30], [Co 2 (mal) 2 Cl 2 (H 2 O) 2 ] n [31], [Co 2 (H 2 O) 3 (cbdc) 2 ] n (cbdc 2− -cyclobutane-1,1dicarboxylate dianions) [32], [Co 3 (tar) 2 (H 2 O) 6 ]•2H 2 O (tar 3− -tartronate anion or hydroxymalonic acid anion) [33]. Moreover, there are examples of the assembly of molecular 36-core polyanions with dimethylmalonic acid anions, (NBu 4 ) 6 [Co 36 (H 2 O) 12 (OH) 20 (HMe 2 Mal) 2 (Me 2 Mal) 28 ]•3EtOH [22]. Data on the magnetic properties of Co II compounds with anions of substituted malonic acids are scarce.…”