Solid-state photolysis of tris(oxalato)cobalt(III) in a host lattice

Spees, Steven T.; Sarma, Atul C.; Fenerty, Anne

doi:10.1021/j100720a027

Cited by 2 publications

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“…The resulting pink species exhibited a proton conductivity of less than 1 × 10 –10 S cm –1 , lower by more than ∼5 orders of magnitude compared with the parent LaCo (Figure ). Such color changes of trioxalatocobaltate(III) compounds have long been known and were explained by the transformation into a cobalt(II) species. − Usha reported thermal decomposition of LaCo to form pink-colored La III Co II (ox) 2.5 · n H 2 O in different hydrations, but the La III Co II compound was not fully identified . Because of our interest in conduction–network correlation, we performed the identification and characterization of the pink compound derived from LaCo .…”

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Proton Conduction Study on Water Confined in Channel or Layer Networks of La^IIIM^III(ox)₃·10H₂O (M = Cr, Co, Ru, La)

et al. 2015

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Proton conduction of the La(III)M(III) compounds, LaM(ox)3·10H2O (abbreviated to LaM; M = Cr, Co, Ru, La; ox(2-) = oxalate) is studied in view of their networks. LaCr and LaCo have a ladder structure, and the ladders are woven to form a channel network. LaRu and LaLa have a honeycomb sheet structure, and the sheets are combined to form a layer network. The occurrence of these structures is explained by the rigidness versus flexibility of [M(ox)3](3-) in the framework with large La(III). The channel networks of LaCr and LaCo show a remarkably high proton conductivity, in the range from 1 × 10(-6) to 1 × 10(-5) S cm(-1) over 40-95% relative humidity (RH) at 298 K, whereas the layer networks of LaCr and LaCo show a lower proton conductivity, ∼3 × 10(-8) S cm(-1) (40-95% RH, 298 K). Activation energy measurements demonstrate that the channels filled with water molecules serve as efficient pathways for proton transport. LaCo was gradually converted to La(III)Co(II)(ox)2.5·4H2O, which had no channel structure and exhibited a low proton conductivity of less than 1 × 10(-10) S cm(-1). The conduction-network correlation of LaCo(ox)2.5·4H2O is reported.

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Section: Resultsmentioning

confidence: 99%

Proton Conduction Study on Water Confined in Channel or Layer Networks of La^IIIM^III(ox)₃·10H₂O (M = Cr, Co, Ru, La)

et al. 2015

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Preparation and thermal stability of trioxalatocobaltates of bivalent metals KM2+ [Co(C2O4)3]·xH2O

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Solid-state photolysis of tris(oxalato)cobalt(III) in a host lattice

Cited by 2 publications

References 4 publications

Proton Conduction Study on Water Confined in Channel or Layer Networks of La^IIIM^III(ox)₃·10H₂O (M = Cr, Co, Ru, La)

Proton Conduction Study on Water Confined in Channel or Layer Networks of La^IIIM^III(ox)₃·10H₂O (M = Cr, Co, Ru, La)

Preparation and thermal stability of trioxalatocobaltates of bivalent metals KM2+ [Co(C2O4)3]·xH2O

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Solid-state photolysis of tris(oxalato)cobalt(III) in a host lattice

Cited by 2 publications

References 4 publications

Proton Conduction Study on Water Confined in Channel or Layer Networks of LaIIIMIII(ox)3·10H2O (M = Cr, Co, Ru, La)

Proton Conduction Study on Water Confined in Channel or Layer Networks of LaIIIMIII(ox)3·10H2O (M = Cr, Co, Ru, La)

Preparation and thermal stability of trioxalatocobaltates of bivalent metals KM2+ [Co(C2O4)3]·xH2O

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Proton Conduction Study on Water Confined in Channel or Layer Networks of La^IIIM^III(ox)₃·10H₂O (M = Cr, Co, Ru, La)

Proton Conduction Study on Water Confined in Channel or Layer Networks of La^IIIM^III(ox)₃·10H₂O (M = Cr, Co, Ru, La)