Technology Alerts: MESOPOROUS METAL

CATEGORY: MESOPOROUS METAL–ORGANIC FRAMEWORKS
Structural Diversities in Metal-Organic Coordination Polymers Based on Flexibility in Organic Spacer

Type	Journal Article
Author	Anindita Chakraborty
Author	Tapas Kumar Maji
URL	Free Full Text: http://journal.iisc.ernet.in/index.php/iisc/article/view/4455
Volume	94
Issue	1
Pages	69-78
Publication	Journal of the Indian Institute of Science
Date	2014/01/01
Abstract	Metal-organic coordination polymers with their various novel structural motifs have drawn intense research interests over the last few decades. Interestingly, flexibility of the organic spacers in such metalorganic coordination polymers can direct various structural topology and intricate networks. A novel 1D coordination polymer and some other illustrative examples with different flexible ligands like 1,2-bis(4-pyridyl)ethane (bpe) and 1,3-bis(4-pyridyl)propane (bpp) have been discussed in this review. Both gauche and anti-conformations could be adopted by the bpe ligand, and hence diverse structures can be furnished. Further flexibility could be achieved by exploiting longer ligand like 1,3-bis(4-pyridyl) propane (bpp). Our group has been pursuing research to furnish such flexible compounds and study their different functionalities. An account of design of such diverse systems by employing judicious ligand design strategy and their different structural aspects will be presented in this review.

CATEGORY: MESOPOROUS METAL–ORGANIC FRAMEWORKS
Metal-organic frameworks based upon non-zeotype 4-connected topology

Type	Journal Article
Author	Dong-Sheng Li
Author	Ya-Pan Wu
Author	Jun Zhao
Author	Jian Zhang
Author	Jack Y. Lu
URL	http://www.sciencedirect.com/science/article/pii/S0010854513002506
Volume	261
Pages	1-27
Publication	Coordination Chemistry Reviews
Date	February 15, 2014
Abstract	Understanding the basic correlations between the composition, physical properties and topology of the underlying nets is crucial to further design and successfully prepare for the functional metal-organic framework materials,. Authors focus on recent advances in metal-organic frameworks (MOFs) that possess more common non-zeotype 4-connected topological nets (such as sql, kag, nbo, lvt, cds, qtz, dia, lon, pts, etc.) They discuss the synthetic strategies of non-zeotype 4-connected MOFs and their related properties. They emphasize how to establish basic design principles and synthetic methodology to construct the same topological MOFs with different functions using specifically designed organic linkers.

CATEGORY: MESOPOROUS METAL–ORGANIC FRAMEWORKS
Highly mesoporous metal–organic framework assembled in a switchable solvent

Type	Journal Article
Author	Li Peng
Author	Jianling Zhang
Author	Zhimin Xue
Author	Buxing Han
Author	Xinxin Sang
Author	Chengcheng Liu
Author	Guanying Yang
URL	Free Full Text: http://www.nature.com/ncomms/2014/140722/ncomms5465/full/ncomms5465.html#affil-auth
Volume	5
Publication	Nature Communications
Date	July 22, 2014
Abstract	The mesoporous metal–organic frameworks are a family of materials that have pore sizes ranging from 2 to 50 nm, which have shown promising applications in catalysis, adsorption, chemical sensing and so on. The preparation of mesoporous metal–organic frameworks usually needs the supramolecular or cooperative template strategy. Here we report the template-free assembly of mesoporous metal–organic frameworks by using CO2-expanded liquids as switchable solvents. The mesocellular metal–organic frameworks with large mesopores (13–23 nm) are formed, and their porosity properties can be easily adjusted by controlling CO2 pressure. Moreover, the use of CO2 can accelerate the reaction for metal–organic framework formation from metal salt and organic linker due to the viscosity-lowering effect of CO2, and the product can be recovered through CO2 extraction. The as-synthesized mesocellular metal–organic frameworks are highly active in catalysing the aerobic oxidation of benzylic alcohols under mild temperature at atmospheric pressure.

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