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Thermodynamically metastable thiocyanato coordination polymer that shows slow relaxations of the magnetization

Thermodynamically metastable thiocyanato coordination ...

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dc.contributor.author Werner, Julia pl
dc.contributor.author Rams, Michał [SAP11016294] pl
dc.contributor.author Tomkowicz, Zbigniew [SAP11006648] pl
dc.contributor.author Runčevski, Tomče pl
dc.contributor.author Dinnebier, Robert E. pl
dc.contributor.author Suckert, Stefan pl
dc.contributor.author Näther, Christian pl
dc.date.accessioned 2015-07-16T15:12:43Z
dc.date.available 2015-07-16T15:12:43Z
dc.date.issued 2015 pl
dc.identifier.issn 0020-1669 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/13102
dc.language eng pl
dc.rights Dodaję tylko opis bibliograficzny *
dc.rights.uri *
dc.title Thermodynamically metastable thiocyanato coordination polymer that shows slow relaxations of the magnetization pl
dc.type JournalArticle pl
dc.description.physical 2893-2901 pl
dc.abstract.en Reaction of cobalt thiocyanate with 4-acetylpyridine leads to the formation of \left [ Co\left ( NCS \right )_{2}\left ( 4-acetylpyridine \right )_{2} \right ]_{n} (3/I). In its crystal structure the Co cations are connected by pairs of \mu -1.3-bridging thiocyanato ligands into dimers that are further connected into layers by single anionic ligands. DTA-TG measurements of Co\left ( NCS \right )_{2}\left ( 4-acetylpyridine \right )_{4} (1) led to the formation of 3/I. In contrast, when the hydrate Co\left ( NCS \right )_{2}\left ( 4-acetyl-pyridine \right )_{2}\left ( H_{2}O \right ) (2) is decomposed, a mixture of 3/I and a thermodynamically metastable form 3/II is obtained. Further investigations reveal that thermal annealing of 2 leads to the formation of 3/II, that contains only traces of the stable form 3/I. DSC and temperature dependent X-ray powder diffraction (XRPD) measurements prove that 3/II transforms into 3/I on heating. The crystal structure of 3/II was determined ab initio from XRPD data. In its crystal structure the Co cations are linked by pairs of bridging thiocyanato anions into a 1D coordination polymer, and thus, 3/II is an isomer of 3/I. Magnetic measurements disclose that the stable form 3/I only shows paramagnetism without any magnetic anomaly down to 2 K. In contrast, the metastable form 3/II shows ferromagnetic behavior. The phase transition into ordered state at T_{c} = 3.8 K was confirmed by specific heat measurements. Alternating current susceptibility measurements show frequency dependent maxima in χ′ and χ″, which is indicative for a slow relaxation of the magnetization. pl
dc.description.volume 54 pl
dc.description.number 6 pl
dc.identifier.doi 10.1021/ic503029t pl
dc.identifier.eissn 1520-510X pl
dc.title.journal Inorganic Chemistry pl
dc.language.container eng pl
dc.affiliation Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego pl
dc.subtype Article pl
.pointsMNiSW [2015 A]: 45


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