NDLI: Preparation of potentially porous, chiral organometallic materials through spontaneous resolution of pincer palladium conformers

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rissanen, Kari Johnson, Magnus T. Cetina, Mario Wendt, Ola F. Ahlquist, Mårten S. G. Öhrström, Lars Dzolic, Zoran Lahtinen, Manu
Description	Author Affiliation: Johnson MT ( Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P.O. Box 124, S-221 00 Lund, Sweden.)
Abstract	Understanding the mechanism by which advanced materials assemble is essential for the design of new materials with desired properties. Here, we report a method to form chiral, potentially porous materials through spontaneous resolution of conformers of a PCP pincer palladium complex ({2,6-bis[(di-t-butylphosphino)methyl]phenyl}palladium(II)halide). The crystallisation is controlled by weak hydrogen bonding giving rise to chiral qtz-nets and channel structures, as shown by 16 such crystal structures for X = Cl and Br with various solvents like pentane and bromobutane . The fourth ligand (in addition to the pincer ligand ) on palladium plays a crucial role; the chloride and the bromide primarily form hexagonal crystals with large 1D channels, whereas the iodide (presumably due to its inferior hydrogen bonding capacity) forms monoclinic crystals without channels. The hexagonal channels are completely hydrophobic and filled with disordered solvent molecules. Upon heating, loss of the solvent occurs and the hexagonal crystals transform into other non-porous polymorphs. Also by introducing a strong acid, the crystallisation process can be directed to a different course, giving several different non-porous polymorphs. In conclusion, a number of rules can be formulated dictating the formation of hexagonal channel structures based on pincer palladium complexes. Such rules are important for a rational design of future self-assembling materials with applications in storage and molecular recognition.
ISSN	14779226
Issue Number	23
Volume Number	42
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-06-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Organometallic Compounds Chemistry Palladium Crystallography, X-Ray Molecular Structure Porosity Stereoisomerism Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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