2026-05-31T04:16:01Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/210392026-02-03T11:13:40Zcom_10630_2254col_10630_37953

Multifunctional lanthanum tetraphosphonates: Flexible, ultramicroporous and proton-conducting hybrid frameworks Pérez-Colodrero, Rosario Mercedes Olivera-Pastor, Pascual Losilla, Enrique R. García-Aranda, Miguel Ángel León-Reina, Laura Papadaki, M. McKinlay, Alistair C. Morris, Russell E. Demadis, Konstantinos D. Cabeza-Díaz, Aurelio Química inorgánica A new flexible ultramicroporous solid, La(H5DTMP)·7H2O (1), has been crystallized at room temperature using the tetraphosphonic acid H8DTMP, hexamethylenediamine-N,N,N′,N′-tetrakis(methylenephosphonic acid). Its crystal structure, solved by synchrotron powder X-ray diffraction, is characterised by a 3D pillared open-framework containing 1D channels filled with water. Upon dehydration, a new related crystalline phase, La(H5DTMP) (2) is formed. Partial rehydration of 2 led to La(H5DTMP)·2H2O (3). These new phases contain highly corrugated layers showing different degrees of conformational flexibility of the long organic chain. The combination of the structural study and the gas adsorption characterization (N2 and CO2) suggests an ultramicroporous flexible framework. NO isotherms are indicative of a strong irreversible adsorption of NO within the pores. Impedance data indicates that 1 is a proton-conductor with a conductivity of 8 × 10−3 S cm−1 at 297 K and 98% of relative humidity, and an activation energy of 0.25 eV. 2021-03-08T08:34:10Z 2021-03-08T08:34:10Z 2012 journal article Dalton Trans., 2012, 41, 4045–4051 https://hdl.handle.net/10630/21039 10.1039/c2dt11992g eng open access The Royal Society of Chemistry