Open-Framework Cadmium Oxalates with Channels Stabilized by Alkali Metal Ions

Vaidhyanathan, Ramanathan; Natarajan, Srinivasan; Rao, C. N. R.

doi:10.1006/jssc.2001.9186

Cited by 24 publications

(6 citation statements)

References 39 publications

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“…Additionally, there are small four-membered apertures (4.012 × 5.220 Å) formed by the connectivity between the Cd and the bischelating succinates, which are aligned along the a- axis, forming one-dimensional tunnels within each layer (Figure ). Interestingly, the amine molecules in IV lie in the plane of the layer and form strong N−H···O interactions with the succinate O atoms (Figure ), in contrast to the layered metal oxalates, where the charge-balancing organic-amine cations reside in the interlamellar region. The water molecules in IV reside in the interlamellar region (Figure ), which is relatively less hydrophobic than the apertures within the layers.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, IV possesses unique four-membered apertures, so aligned as to form one-dimensional tunnels along the a -axis (Figure ), wherein the amine is located. The two-dimensional architecture in IV is distinctly different from the honeycomb architectures of many of the metal oxalates. ,, Although both IV and V contain layers involving three-coordinated succinate oxygens, the difference in the succinate connectivity (monodendate in IV and bidendate in V ) results in apertures of much smaller size (6.129 × 4.737 Å) in V (Figure ). Two-dimensional architectures containing three-coordinated oxygens are often observed in metal dicarboxylates. ,− Monodendate binding by the succinate units in framework metal-succinate compounds 10,45 appears to be more frequent than in oxalate-based compounds …”

Section: Discussionmentioning

confidence: 99%

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Open-Framework Cadmium Succinates of Different Dimensionalities

2002

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Open-framework cadmium succinates, [CN(3)H(6)](2)[Cd(2)(C(4)H(4)O(4))(Cl)(2)], I; [CN(3)H(6)](2)[Cd(C(4)H(4)O(4))(2)], II; Cd(2)(C(4)H(4)O(4))(2)(C(4)N(2)H(8))(H(2)O)(3), III; [C(4)N(2)H(12)][Cd(2)(C(4)H(4)O(4))(3)].4H(2)O, IV; Cd(C(4)H(4)O(4))(H(2)O)(2), V; and Cd(3)(C(4)H(4)O(4))(2)(OH)(2)], VI, of different dimensionalities have been synthesized by hydrothermal procedure by employing two different strategies, one involving the reaction of Cd salts with organic-amine succinates and the other involving the hydrothermal reaction of Cd salts with a mixture of succinic acid and the organic amine. While the latter procedure yields structures without any amine in them, the former gives rise to amine templated cadmium succinates with open architectures. By employing guanidinium succinate we have obtained I and II, and with piperazinium succinate we obtained III and IV. Of these I has a one-dimensional chain structure, IV has a layered structure, and II and III have three-dimensional architectures. The two cadmium succinates without incorporation of amine, V and VI, possess layered and three-dimensional structures, respectively. The three-dimensional structures II and III exhibit interpenetration similar to that in diamondoid and alpha-polonium type structures, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Open-Framework Cadmium Succinates of Different Dimensionalities

2002

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“…To our best knowledge, no studies were devoted to behavior of system with simultaneously present cadmium and lead ions and one LMWOA (OA, CA) ligand. Nevertheless, among numbers of synthetically prepared complexes of dicarboxylic acids, new type of crystalline oxalates have been described, M 4 Cd 2 (C 2 O 4 ) 4 · 4H 2 O, where M is alkali metal, Na or K [21] and MM'(C 2 O 4 ) 3 · 3H 2 O, where M ¼ Cd, Hg, Pb and M' ¼ Zr, Hf [22].…”

Section: Heavy Metals Complexation With Lmwoasmentioning

confidence: 99%

Electrochemical Detection of Cadmium and Lead Complexes with Low Molecular Weight Organic Acids

et al. 2009

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The Cd and Pb complexes with oxalic (OA) and citric acid (CA) were detected in model and soil solutions using cyclic and stripping voltammetry. A mixed complex consisting of Cd, Pb, and OA was found; its peak potential varied from À 582.0 to À 542.5 mV (vs. Ag/AgCl/KCl(3 mol L À1 )). For mixed complex formation, the presence of PbOH þ species and Cd 2þ in oxalic acid solution was necessary. Only the simple complexes of CA with Pb and Cd were found in the model solution. The existence of all investigated metal complexes is confined to neutral pH range. The mixed complex was also found in real soil solutions.

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“…One emerging family of organic metal materials with open frameworks was reported in the last decade, and it includes metal oxalates that were widely synthesized and studied. Some divalent metals such as nickel [2][3][4][5], Copper [6], zinc [7][8][9][10] and cadmium [11][12][13][14][15][16][17], and trivalent metals such as indium [18] and neodymium [19] oxalates have also been reported. Thereby threedimensional structures are formed if oxalate units connect the layers, others are layered oxalates with honeycomb networks and some of these structures are monomers.…”

Section: Introductionmentioning

confidence: 99%