Abstract
[Zn(bispicam)2]2+ as a hydrogen-bond donor and three free halides (Cl-, Br- and I-) as hydrogen-bond acceptors were employed to investigate the role of non-classical C/N-H⋯X hydrogen bonding for construction of polymeric compounds. Three zinc salts (ZnCl2, ZnBr2 and ZnI2) were reacted with bis(2-pyridylmethyl)amine (bispicam) to produce [Zn(bispicam)2]Cl2 1, [Zn(bispicam)2]Br2 2 and [Zn(bispicam)2]I2 3. Hydrogen bonding interactions between Namine-H and C-H of [Zn(bispicam)2]2+ cations and free halides, and between Owater-H and free halides can play very important roles for construction of molecular packing and crystal structures. In addition, these hydrogen-bonded complexes 1, 2 and 3 were, interestingly, shown to carry out the catalytic transesterification of a range of esters with methanol at 50 °C under the mild conditions, though all these compounds are saturated with two bispicam ligands. To explain this unusual reactivity, it has been proposed that the hydrogen atom of amine N-H moiety in the complexes could do the acid-catalyzed transesterification.
Original language | English |
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Pages (from-to) | 123-129 |
Number of pages | 7 |
Journal | Journal of Molecular Structure |
Volume | 890 |
Issue number | 1-3 |
DOIs | |
State | Published - 12 Nov 2008 |
Bibliographical note
Funding Information:Financial support from the Korea Research Foundation (2006-312-C00569 and 2007-314-C00159), THE SEOUL R & BD Program, Environmental Technology Educational Innovation Program (2006) of the Ministry of Environment, and the SRC program of the Korea Science and Engineering Foundation (KOSEF) through the Center for Intelligent Nano-Bio Materials at Ewha Womans University (Grant: R11-2005-008-03001-0) is gratefully acknowledged.
Keywords
- Bis(2-pyridylmethyl)amine
- Catalyst
- Hydrogen bond
- Transesterification
- Zinc(II) coordination polymer