Reference

A Thermally Stable Pt/Y-Based Metal-Organic Framework: Exploring the Accessibility of the Metal Centers with Spectroscopic Methods Using H2O, CH3OH, and CH3CN as Probes

All Rights Reserved. A Thermally Stable Pt/Y-Based Metal-Organic Framework: Exploring the Accessibility of the Metal Centers with Spectroscopic Methods Using H2O, CH3OH, and CH3CN as Probes. Szeto, Kai Chung; Lillerud, Karl Petter; Tilset, Mats; Bjorgen, Morten; Prestipino, Carmelo; Zecchina, Adriano; Lamberti, Carlo; Bordiga, Silvia (Department of Chemistry, University of Oslo, Oslo N-0315, Norway). Journal of Physical Chemistry B, 110(43), 21509-21520 (English) 2006 American Chemical Society. CODEN: JPCBFK. ISSN: 1520-6106. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 66, 73, 75 A metal-org. framework (MOF) based on Pt, Y, and 2,2'-bipyridine-5,5'-dicarboxylate (BPDC), Pt3Y2(BPDC)3(H2O)4Cl6×7H2O, stable up to 400°, was synthesized and characterized. In this MOF, the Pt centers are coordinated to Cl and the N atoms of the BPDC unit, giving a local environment similar to that found in Pt-org. complexes with catalytic activity toward C-H bond cleavage of alkanes. This new material is a heterogeneous counterpart to the corresponding metal-org. complex. The structure, detd. by single-crystal XRD data, is the repetition of three covalently bonded layers. These layers form a block, which is stacking as an (a)(b)(c) sequence along the crystallog. 10025-99-7 and 1802-30-8 which are cas registry numbers are also used here. b-axis. Each layer contains the Pt-org. unit, while Y atoms represent the connection between adjacent layers. No covalent connection is present between layer (a) of a block and layer (c) of an adjacent block. EXAFS (BM29 at the ESRF) anal. supports the XRD data. As this MOF crystallizes under hydrothermal conditions, H2O acts both as solvent and as a direct ligand of Y. Accessibility to the metal centers is demonstrated by reversible H2O desorption/readsorption, as detd. by TPA/TPD, FTIR, UV-visible, EXAFS, and XANES. Importantly, the as-synthesized material will not suffer a permanent loss in porosity upon solvent removal. In addn. to H2O, MeOH, EtOH, and MeCN can also access the internal void of the dehydrated phase. .

Synthesis and structure of a bipyridinedicarboxylate connected neodymium organic framework

Synthesis and structure of a bipyridinedicarboxylate connected neodymium organic framework. Schoknecht, Birk; Kempe, Rhett (Lehrstuhl fuer Anorganische Chemie II, Universitaet Bayreuth, Bayreuth D-95440, Germany). Zeitschrift fuer Anorganische und Allgemeine Chemie, 630(10), 1377-1379 (English) 2004 Wiley-VCH Verlag GmbH & Co. KGaA. CODEN: ZAACAB. ISSN: 0044-2313. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 75 The porous Nd coordination polymer {[L3Nd2(H2O)4] (LH2 = 2,2'-bipyridine-5,5'-dicarboxylic acid)} was prepd. via a hydrothermal synthesis approach starting from Nd(NO3)3×6H2O and 2,2'-bipyridine-5,5'-dicarboxylic acid in a one to one mixt. of EtOH and H2O at 160°. The product was characterized by single crystal x-ray diffraction, TGA and elemental anal. Space group: P1, a 6.0294(4), b 10. 1802-30-8 and 828917-78-8 which are cas registry numbers are also used here.9061(6), c 13.8392(9) ?, a 101.486(7), b 93.799(8)°, g 100.933(7)°, R1[>2s(1)] = 0.0147, wR2 (all data) = 0.0328. The structure detn. revealed 1 to be a 3-dimensional network with eight-coordinated lanthanide centers acting as 5-connectors and two types of bipyridinedicarboxylate cross-linkers, as 3- and a 4-connectors. After the loss of H2O - two per Nd atom - channels are formed with a channel diam. of 4.82 ? [atom to atom distances (Nd-O)]. .