title: A Lamellar Coordination Polymer with Remarkable Catalytic Activity.
abstract: A positively charged lamellar coordination polymer based on a flexible triphosphonic acid linker is reported. [Gd(H4 nmp)(H2 O)2 ]Cl⋅2 H2 O (1) [H6 nmp=nitrilotris(methylenephosphonic acid)] was obtained by a one-pot approach by using water as a green solvent and by forcing the inclusion of additional acid sites by employing HCl in the synthesis. Compound 1 acts as a versatile heterogeneous acid catalyst with outstanding activity in organic reactions such as alcoholysis of styrene oxide, acetalization of benzaldehyde and cyclohexanaldehyde and ketalization of cyclohexanone. For all reaction systems, very high conversions were reached (92-97 %) in only 15-30 min under mild conditions (35 °C, atmospheric pressure). The coordination polymer exhibits a protonic conductivity of 1.23×10(-5)  S cm(-1) at 98 % relative humidity and 40 °C.
authors: Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal.
authors: Ricardo F
authors: RF
authors: Mendes
authors: Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal.
authors: Margarida M
authors: MM
authors: Antunes
authors: Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal.
authors: Patrícia
authors: P
authors: Silva
authors: Department of Materials and Ceramic Engineering, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal.
authors: Paula
authors: P
authors: Barbosa
authors: Department of Materials and Ceramic Engineering, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal.
authors: Filipe
authors: F
authors: Figueiredo
authors: Department of Chemistry, University of Zürich, 8057, Zürich, Switzerland.
authors: Anthony
authors: A
authors: Linden
authors: Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal.
authors: João
authors: J
authors: Rocha
authors: Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal. atav@ua.pt.
authors: Anabela A
authors: AA
authors: Valente
authors: Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal. filipe.paz@ua.pt.
authors: Filipe A
authors: http://orcid.org/0000-0003-2051-5645
authors: FA
authors: Almeida Paz
keywords: conducting materials; heterogeneous catalysis; lanthanides; layered materials; metal-organic frameworks