WFRF:(Diaz Francesc)
Search: WFRF:(Diaz Francesc) > (2010-2014) > Synthesis, Crystal ...
- 2 of 2
- Previous record
- Next record
- To hitlist
Synthesis, Crystal Structure and Magnetic Characterization of a Series of Cu-II-Ln(III) Heterometallic [Ln = La, Ce, Pr, Nd and Sm) Metal-Organic Compounds with an Unusual Single Crystal to Single Crystal Phase Transition
- Diaz-Gallifa, Pau (author)
- Fabelo, Oscar (author)
- Canadillas-Delgado, Laura (author)
- show more...
- Pasan, Jorge (author)
- Lloret, Francesc (author)
- Julve, Miguel (author)
- Ruiz-Perez, Catalina (author)
- show less...
- (creator_code:org_t)
- 2013-10-07
- 2013
- English.
- In: Crystal Growth & Design. - : American Chemical Society (ACS). - 1528-7483 .- 1528-7505. ; 13:11, s. 4735-4745
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- The synthesis and structural characterization of five Cu(II)-Ln(III) heteronuclear metal-organic frameworks of formula {[Ln(4)Cu(4)(H2O)(26)(bta)(5)]center dot mH(2)O} and {[Ln(4)Cu(4)(H2O)(24)(bta)(5)]center dot pH(2)O} [Ln = La-III (1A/1B), Ce-III (2A/2B), Pr-III (3A/3B), Nd-III (4A/4B) and Sm-III (5A/5B) with m/p = 20 (1A)/16 (1B), 18 (2A)/16 (2B), 14 (3016 (3B), 22 (4A)/16 (4B) and 21 (5A)/14 (5B); H(4)bta =1,2,4,5-benzenetetracarboxylic acid (1-5)] have been performed. These compounds present a single-crystal to single-crystal phase transition from expanded A phases toward the B shrinking networks, which is triggered only in the presence of a dry environment. This phase transition is accompanied by a compression of the crystallographic b-axis in the range 2.4 to 2.8 angstrom with the consequent decrease of the unit cell volume from 9.5% to 12%. The isomorphous crystal structures of 1A-5A can be described as two crystallographically independent [Cu(II)-Ln(III)] heterometallic dinuclear units which are connected through two crystallographically independent bta(4-) ligands in the ac-plane, leading to 4,4-rectangular grids. These layers are connected along the crystallographic b-axis, through a pillaring bta(4-) group. The phase transition implies a change of the coordination mode of the bta4- pillar from bis-monodentate (1A-5A) to tetrakis-monodentate (1B-5B). Magnetic susceptibility measurements of polycrystalline samples of 1A-5A in the temperature range 2.0-300 K have in common the decrease of the chi T-M product with T which in the case of 1A is due to weak antiferromagnetic interactions between the copper(II) ions through the bta4- skeleton, the Lam cation being diamagnetic [J = -3.5 cm(-1) with the Hamiltonian defined H = -JS(Cu1)center dot S-Cu2,]. For the 2A-5A compounds, the additional exchange interaction between Cu-II and the paramagnetic Ln(II) is masked by the crystal field effects (which partially removes the 2J + 1 degeneracy of the L-2S+1(J) free-ion ground state in zero magnetic field) (2A-5A) and the thermal population of excited free-ion states (5A).
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
Find in a library
- Crystal Growth & Design (Search for host publication in LIBRIS)
To the university's database
- 2 of 2
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Diaz-Gallifa, Pa ...
- Fabelo, Oscar
- Canadillas-Delga ...
- Pasan, Jorge
- Labrador, Ana
- Lloret, Francesc
- show more...
- Julve, Miguel
- Ruiz-Perez, Cata ...
- show less...
- About the subject
-
- NATURAL SCIENCES
- NATURAL SCIENCES
- and Physical Science ...
- Articles in the publication
- Crystal Growth & ...
- By the university
- Lund University
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
