A soft chemistry approach to preparing (de)sodiated transition-metal hydroxy molybdates

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dc.creatorGuilherme Mendes Martins
dc.creatorRoberto Luiz Moreira
dc.creatorAnderson Dias
dc.date.accessioned2023-11-30T18:26:38Z
dc.date.accessioned2025-09-09T01:19:41Z
dc.date.available2023-11-30T18:26:38Z
dc.date.issued2020
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipFINEP - Financiadora de Estudos e Projetos, Financiadora de Estudos e Projetos
dc.description.sponsorshipOutra Agência
dc.identifier.doihttps://doi.org/10.1039/C9CE01554J
dc.identifier.issn1466-8033
dc.identifier.urihttps://hdl.handle.net/1843/61578
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofCrystEngComm
dc.rightsAcesso Restrito
dc.subjectLigas de metais de transição
dc.subjectCompostos de molibdênio
dc.subjectMicroondas
dc.subjectRaman, Espectroscopia de
dc.subjectPolimorfismo (Cristalografia)
dc.subject.otherTransition-metal
dc.subject.otherHydroxy molybdates
dc.subject.otherHydrothermal conditions
dc.subject.otherMicrowave-assisted
dc.subject.otherRaman spectroscopy
dc.subject.otherPolymorphic transformation
dc.titleA soft chemistry approach to preparing (de)sodiated transition-metal hydroxy molybdates
dc.typeArtigo de periódico
local.citation.epage1955
local.citation.spage1939
local.citation.volume22
local.description.resumoA soft chemistry approach was applied to synthesize de(sodiated) transition-metal hydroxy molybdates under hydrothermal conditions. Different NaM2(H3O2)(MoO4)2 and M2MoO4(OH)2 compositions (M = Ni, Zn) were prepared at mild temperatures (110–250 °C) for times ranging from 10 min to 24 h. Sodiated compounds were obtained after a microwave-assisted hydrothermal process at 150 °C (10–120 min) for zinc-based materials. Besides, conventional heating destabilized the sodiated NaZn2(H3O2)(MoO4)2 phase at 110 °C, thus increasing the amount of Zn2MoO4(OH)2 at temperatures up to 250 °C. NaNi2(H3O2)(MoO4)2 phases were noted only for 10 min under microwave irradiation, while longer times promoted a chemical reaction towards a new desodiated phase. This novel Ni2MoO4(OH)2 phase was also obtained by conventional hydrothermal processing (110–250 °C, 24 h). Slow precipitation rates yielded a hydrated nickel molybdate (triclinic, P[1 with combining macron]) after coprecipitation followed or not by microwave irradiation. Raman spectroscopy analysis results showed a good agreement with experimental results and group-theory calculations for both sodiated and desodiated materials. A temperature-induced polymorphic transformation was observed from NiMoO4·xH2O (triclinic, P[1 with combining macron]) to α-NiMoO4 (monoclinic, C2/m). For all the obtained polymorphs, the relevant Raman modes were depicted, allowing us to determine their spectroscopic fingerprints. The results constitute an important basis on the understanding of the synthesis of (de)sodiated transition-metal hydroxy molybdates under hydrothermal conditions.
local.identifier.orcidhttps://orcid.org/0000-0001-7620-6708
local.identifier.orcidhttps://orcid.org/0000-0001-6820-0269
local.identifier.orcidhttps://orcid.org/0000-0001-7413-1087
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://pubs.rsc.org/en/content/articlelanding/2020/ce/c9ce01554j#!

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