0000000001302730
AUTHOR
Maciej Ptak
The structural, phonon and optical properties of [CH3NH3]M0.5CrxAl0.5−x(HCOO)3 (M = Na, K; x = 0, 0.025, 0.5) metal–organic framework perovskites for luminescence thermometry
We report the structural, phonon and luminescence studies of six heterometallic perovskite-type metal–organic frameworks (MOFs) templated by methylammonium cations (CH3NH3+ and MeA+) with the following formulae: [MeA]Na0.5Cr0.5(HCOO)3 (MeANaCr), [MeA]K0.5Cr0.5(HCOO)3 (MeAKCr), [MeA]Na0.5Al0.5(HCOO)3 (MeANaAl), [MeA]K0.5Al0.5(HCOO)3 (MeAKAl), [MeA]Na0.5Cr0.025Al0.475(HCOO)3 (MeANaAlCr, 5 mol% of Cr3+ ions) and [MeA]K0.5Cr0.025Al0.475(HCOO)3 (MeAKAlCr, 5 mol% of Cr3+ ions). All of them crystallise in a monoclinic system (P21/n space group) with one MeA+ cation in an asymmetric unit forming four medium-strength hydrogen bonds (HBs) with a metal-formate framework. The DSC measurements and XRD s…
Confinement-induced polymorphism in acetylsalicylic acid–nanoporous glass composites
We report on the experimental observation of confinement-induced new phase appearance in acetylsalicylic acid (ASA)–porous glass (PG) composites. In this study, ASA was embedded in PG host matrices of various pore widths (15–200 nm). The Raman spectra and positron annihilation lifetime measurements exhibit the existence of ASA nanocrystals in the PG matrix. The DSC data revealed that the melting temperature TM and excess specific heat decrease with decreasing the size of embedded ASA nanocrystals. The close inspection of the TM dependence versus diameter of filled pores has shown that the ASA crystallizes in polymorph II in confined matrix. Moreover, it was demonstrated that the ASA spatial…
Novel bimetallic MOF phosphors with an imidazolium cation: structure, phonons, high- pressure phase transitions and optical response
We report the synthesis, crystal structure, phonons and luminescence properties of three novel heterometallic metal organic frameworks (MOFs) with perovskite-like topology of the following formulas: [C3H5N2]Na0.5Cr0.5(HCOO)3 (ImNaCr), [C3H5N2]Na0.5Al0.5(HCOO)3 (ImNaAl) and [C3H5N2]Na0.5Al0.475Cr0.025(HCOO)3 (ImNaAlCr with 5 mol% of Cr3+). ImNaCr crystallizes in a monoclinic system (P2/n space group) with one imidazolium cation (Im+) in an asymmetric unit forming six N–H⋯O and four C–H⋯O hydrogen bonds. In contrast to other known heterometallic MOFs, the complete substitution of Cr3+ ions with smaller Al3+ ions leads to a change of the crystal symmetry. ImNaAl adopts a monoclinic P21/n space…
Effect of surface impurities on downconversion luminescence of Pr3+, Yb3+ activated SrF2 nanoparticles
Abstract Pr3+,Yb3+ activated SrF2 nanoparticles synthesized by low-temperature hydrothermal method were studied. The composition and size of nanoparticles were intentionally changed by controlling synthesis conditions. After structural and morphological characterization, the spectroscopic properties of the nanoparticles were analyzed in the visible and near infrared spectra ranges. The results show correlation between the gradual change of the amount of carboxylate and hydroxyl moieties on the nanoparticle surface, varied by the size nanoparticles and the quenching of the luminescence. The size-related amount of surface quenchers is strongly connected to the decrease of the downconversion e…
CCDC 1847383: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Błażej Dziuk, Dagmara Stefańska, Krzysztof Hermanowicz|2019|Phys.Chem.Chem.Phys.(PCCP)|21|7965|doi:10.1039/C9CP01043B
CCDC 1584365: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Bartosz Zarychta, Dagmara Stefańska, Aneta Ciupa, Waldeci Paraguassu|2019|Dalton Trans.|48|242|doi:10.1039/C8DT04246B
CCDC 1847385: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Błażej Dziuk, Dagmara Stefańska, Krzysztof Hermanowicz|2019|Phys.Chem.Chem.Phys.(PCCP)|21|7965|doi:10.1039/C9CP01043B
CCDC 1836882: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Błażej Dziuk, Dagmara Stefańska, Krzysztof Hermanowicz|2019|Phys.Chem.Chem.Phys.(PCCP)|21|7965|doi:10.1039/C9CP01043B
CCDC 1555613: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Bartosz Zarychta, Dagmara Stefańska, Aneta Ciupa, Waldeci Paraguassu|2019|Dalton Trans.|48|242|doi:10.1039/C8DT04246B
CCDC 1584364: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Bartosz Zarychta, Dagmara Stefańska, Aneta Ciupa, Waldeci Paraguassu|2019|Dalton Trans.|48|242|doi:10.1039/C8DT04246B
CCDC 1836883: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Błażej Dziuk, Dagmara Stefańska, Krzysztof Hermanowicz|2019|Phys.Chem.Chem.Phys.(PCCP)|21|7965|doi:10.1039/C9CP01043B
CCDC 1555612: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Bartosz Zarychta, Dagmara Stefańska, Aneta Ciupa, Waldeci Paraguassu|2019|Dalton Trans.|48|242|doi:10.1039/C8DT04246B
CCDC 1836884: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Błażej Dziuk, Dagmara Stefańska, Krzysztof Hermanowicz|2019|Phys.Chem.Chem.Phys.(PCCP)|21|7965|doi:10.1039/C9CP01043B
CCDC 1836885: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Błażej Dziuk, Dagmara Stefańska, Krzysztof Hermanowicz|2019|Phys.Chem.Chem.Phys.(PCCP)|21|7965|doi:10.1039/C9CP01043B
CCDC 1847386: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Błażej Dziuk, Dagmara Stefańska, Krzysztof Hermanowicz|2019|Phys.Chem.Chem.Phys.(PCCP)|21|7965|doi:10.1039/C9CP01043B
CCDC 1847384: Experimental Crystal Structure Determination
Related Article: Maciej Ptak, Błażej Dziuk, Dagmara Stefańska, Krzysztof Hermanowicz|2019|Phys.Chem.Chem.Phys.(PCCP)|21|7965|doi:10.1039/C9CP01043B