Bispyridine adduct of cobalt(II) mercury(II) tetrathiocyanate

Beauchamp, André L.; Pazdernik, L.; Rivest, R.

doi:10.1107/s0567740876003683

Cited by 18 publications

(3 citation statements)

References 6 publications

(8 reference statements)

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“…To organize these lantern units into extended geometries, we sought an asymmetric, hard–soft ambidentate and/or bridging candidate L that would link these lanterns in a pseudo-1D array. Thiocyanate has previously been shown to bridge metal centers into 1D, − 2D, − and 3D − arrays and has been used as a terminal axial ligand for lantern complexes, including homometallic Cr and Ru , cores, a trinuclear {FeCr 2 } species, and extended metal atom chains (EMACs). − The same hard–soft interactions that ensure homoleptic coordination in our lantern complexes should facilitate directional binding in a 1D system with the harder 3 d metal favoring coordination to N and the softer Pt favoring coordination to S, producing a repeating {PtM-NCS} unit. The two monothiocarboxylate lantern compounds related by a redox couple and ligand rearrangement, namely (PPN)[PtNi(tba) 4 Cl] and [ClPtNi(tba) 4 (OH 2 )], were studied .…”

Section: Introductionmentioning

confidence: 96%

Thiocyanate-Ligated Heterobimetallic {PtM} Lantern Complexes Including a Ferromagnetically Coupled 1D Coordination Polymer

et al. 2016

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A series of heterobimetallic lantern complexes with the central unit {PtM(SAc)4(NCS)} have been prepared and thoroughly characterized. The {Na(15C5)}[PtM(SAc)4(NCS)] series, 1 (Co), 2 (Ni), 3 (Zn), are discrete compounds in the solid state, whereas the {Na(12C4)2)}[PtM(SAc)4(NCS)] series, 4 (Co), 5 (Ni), 6 (Zn), and 7 (Mn), are ion-separated species. Compound 7 is the first {PtMn} lantern of any bridging ligand (carboxylate, amide, etc.). Monomeric 1-7 have M(2+), necessitating counter cations that have been prepared as {(15C5)Na}(+) and {(12C4)2Na}(+) variants, none of which form extended structures. In contrast, neutral [PtCr(tba)4(NCS)]∞ 8 forms a coordination polymer of {PtCr}(+) units linked by (NCS)(-) in a zigzag chain. All eight compounds have been thoroughly characterized and analyzed in comparison to a previously reported family of compounds. Crystal structures are presented for compounds 1-6 and 8, and solution magnetic susceptibility measurements are presented for compounds 1, 2, 4, 5, and 7. Further structural analysis of dimerized {PtM} units reinforces the empirical observation that greater charge density along the Pt-M vector leads to more Pt···Pt interactions in the solid state. Four structural classes, one new, of {MPt}···{PtM} units are presented. Solid state magnetic characterization of 8 reveals a ferromagnetic interaction in the {PtCr(NCS)} chain between the Cr centers of J/kB = 1.7(4) K.

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Section: Introductionmentioning

confidence: 96%

Thiocyanate-Ligated Heterobimetallic {PtM} Lantern Complexes Including a Ferromagnetically Coupled 1D Coordination Polymer

et al. 2016

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“…There are several coloured bimetallic mercury derivatives, purple (Cu(ll) [152]), yellow(Cu(l) [153]andFe(ll) [154]), and a pink-red (Co(ll) [155][156][157][158][159][160][161][162][163]). Herethiocyanate groups serve as bridges between Hg(ll) and the transition metal using the soft and hard ends respectively, giving zig-zag chains.…”

Section: Heteropolynuclear Compoundsmentioning

confidence: 99%

Heterometallic Mercury Compounds: Classification and Analysis of Crystallographical and Structural Data

Holloway¹,

Melnı́k²

1994

Main Group Metal Chemistry

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Mercury is classed as a heavy metal both from its physical properties and its biochemical behaviour.This review includes over two hundred heterometallic mercury compounds of known crystal structure.The heterometal atoms include both transition and non-transition metals, including both hard (class A) and soft (class B) examples. The compounds range from simple hetero-double salts and hetero-bimetallic derivatives to heterometallic clusters of up to twenty one metal atoms. Examples of isomerism include distortion, polymer and linkage isomers. Correlations between structural parameters, heterometal and ligand donor atoms are developed and an overall summary of the metal-metal bonding distances is given.

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“…Over the past several decades, metal–pseudohalide complexes have been extensively studied with respect to the incorporation of neutral nitrogen-donor ligands, such as pyridine derivatives − and polyamines, in the coordination sphere of a metal ion. , In view of the negative charge that accompanies the binding of pseudohalides to a metal ion, it is difficult to attach one or more anionic carboxylate groups into the assembly of a metal carboxylate pseudohalide system. Mixed-ligand complexes of this type may conceivably be achieved by using neutral zwitterionic ligands containing carboxylato oxygen donors, such as amino acids and betaine derivatives, instead of anionic carboxylates.…”

Section: Introductionmentioning

confidence: 99%

pH-Specific Structural Speciation of the Ternary V(V)–Peroxido–Betaine System: A Chemical Reactivity-Structure Correlation

et al. 2012

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Vanadium involvement in cellular processes requires deep understanding of the nature and properties of its soluble and bioavailable forms arising in aqueous speciations of binary and ternary systems. In an effort to understand the ternary vanadium-H(2)O(2)-ligand interactions relevant to that metal ion's biological role, synthetic efforts were launched involving the physiological ligands betaine (Me(3)N(+)CH(2)CO(2)(-)) and H(2)O(2). In a pH-specific fashion, V(2)O(5), betaine, and H(2)O(2) reacted and afforded three new, unusual, and unique compounds, consistent with the molecular formulation K(2)[V(2)O(2)(O(2))(4){(CH(3))(3)NCH(2)CO(2))}]·H(2)O (1), (NH(4))(2)[V(2)O(2)(O(2))(4){(CH(3))(3)NCH(2)CO(2))}]·0.75H(2)O (2), and {Na(2)[V(2)O(2)(O(2))(4){(CH(3))(3)NCH(2)CO(2))}(2)]}(n)·4nH(2)O (3). All complexes 1-3 were characterized by elemental analysis; UV/visible, FT-IR, Raman, and NMR spectroscopy in solution and the solid state; cyclic voltammetry; TGA-DTG; and X-ray crystallography. The structures of 1 and 2 reveal the presence of unusual ternary dinuclear vanadium-tetraperoxido-betaine complexes containing [(V(V)═O)(O(2))(2)] units interacting through long V-O bonds. The two V(V) ions are bridged through the oxygen terminal of one of the peroxide groups bound to the vanadium centers. The betaine ligand binds only one of the two V(V) ions. In the case of the third complex 3, the two vanadium centers are not immediate neighbors, with Na(+) ions (a) acting as efficient oxygen anchors and through Na-O bonds holding the two vanadium ions in place and (b) providing for oxygen-containing ligand binding leading to a polymeric lattice. In 1 and 3, interesting 2D (honeycomb) and 1D (zigzag chains) topologies of potassium nine-coordinate polyhedra (1) and sodium octahedra (3), respectively, form. The collective physicochemical properties of the three ternary species 1-3 project the chemical role of the low molecular mass biosubstrate betaine in binding V(V)-diperoxido units, thereby stabilizing a dinuclear V(V)-tetraperoxido dianion. Structural comparisons of the anions in 1-3 with other known dinuclear V(V)-tetraperoxido binary anionic species provide insight into the chemical reactivity of V(V)-diperoxido systems and their potential link to cellular events such as insulin mimesis and anitumorigenicity modulated by the presence of betaine.

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Bispyridine adduct of cobalt(II) mercury(II) tetrathiocyanate

Cited by 18 publications

References 6 publications

Thiocyanate-Ligated Heterobimetallic {PtM} Lantern Complexes Including a Ferromagnetically Coupled 1D Coordination Polymer

Thiocyanate-Ligated Heterobimetallic {PtM} Lantern Complexes Including a Ferromagnetically Coupled 1D Coordination Polymer

Heterometallic Mercury Compounds: Classification and Analysis of Crystallographical and Structural Data

pH-Specific Structural Speciation of the Ternary V(V)–Peroxido–Betaine System: A Chemical Reactivity-Structure Correlation

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