NDLI: Synthesis and characterisation of two new tripodal metalloligands incorporating zinc(II)

Content Provider	Springer Nature Link
Author	Fanna, Daniel J. Smith, Alexander Zhang, Yingjie Li, Li Shepherd, Nicholas D. Harman, David G. Li, Feng
Copyright Year	2015
Abstract	The in situ Schiff base condensation of 2-acetylpyrazine with tris(2-aminoethyl)amine in the presence of zinc(II) perchlorate was carried out in absolute ethanol and 95 % ethanol, respectively. Two new tripodal metalloligands, 1 and 2, were isolated. The formation of complexes 1 and 2 has been verified by NMR, mass spectral studies and X-ray (for 2), with the evidence indicating that a zinc ion is incorporated in the tripodal cavity defined by the tren backbone in each case. However the products differed in the number of Schiff base condensation reactions that had occurred. While the use of absolute ethanol resulted in condensation at all three primary amine sites of tris(2-aminoethyl)amine, employing 95 % ethanol yielded condensation at only one of the primary amine sites. These different outcomes can be ascribed, at least in part, to the effect of the different water contents in the respective reaction solvents resulting in a shift of the dynamic equilibrium involving imine formation towards the precursor amine and ketone reagents. In 1, steric considerations dictate that the three uncoordinated pyrazine nitrogen donors will have their coordination vectors oriented in a mutually divergent manner suitable for coordination to three different metal centres when acting as a metalloligand while for 2, the X-ray structure confirms that the single uncoordinated (pendent) pyrazine nitrogen is also oriented for ready coordination to a second metal centre.
Starting Page	173
Ending Page	178
Page Count	6
File Format	PDF
ISSN	13883127
Journal	Journal of Inclusion Phenomena and Macrocyclic Chemistry
Volume Number	82
Issue Number	1-2
e-ISSN	15731111
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-05-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tripodal Metalloligand Schiff base Zinc(II) X-ray diffraction Organic Chemistry Food Science Crystallography
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics Food Science

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