RSC Advances
Paper
these ligands along with another two known ligand analogs and
5 E. C. Constable, G. Zhang, C. E. Housecro, M. Neuburger
and J. A. Zampese, CrystEngComm, 2009, 11, 2279.
6 E. C. Constable, G. Zhang, E. Coronado, C. E. Housecro and
M. Neuburger, CrystEngComm, 2010, 12, 2139.
7 E. C. Constable, G. Zhang, C. E. Housecro, M. Neuburger
and J. A. Zampese, CrystEngComm, 2010, 12, 2146.
8 E. C. Constable, G. Zhang, C. E. Housecro, M. Neuburger
and J. A. Zampese, CrystEngComm, 2010, 12, 3733.
9 E. C. Constable, G. Zhang, C. E. Housecro and
J. A. Zampese, CrystEngComm, 2011, 13, 6864.
zinc salts (Zn(OAc) and ZnI ) afforded four coordination poly-
2
2
meric networks and one discrete dimeric complex (compounds
–5). X-ray structural determination conrmed the structural
diversity in the resulting metal assembles. Although the same
metal source Zn(OAc) was used for the syntheses of 1–4,
different coordination assembles were revealed. In the struc-
tures of 1, 3 and 4, the paddle-wheel {Zn (m-OAc) } motif was
1
2
2
4
exclusively observed. The ligands in 1 and 3 adopt similar
coordination mode and form 1-D polymeric chains. However,
the 3-D packing structures in the crystals differ remarkably from 10 E. C. Constable, C. E. Housecro, S. Vujovic and
0
each other, due to the different 4 -substituted groups on
4
J. A. Zampese, CrystEngComm, 2014, 16, 3494.
0
0
00
,2 :6 ,4 -tpy. A microporous network was found in 1, while 11 Y. M. Klein, E. C. Constable, C. E. Housecro, J. A. Zampese
chains stack compactly together through p/p interactions in 3 and A. Crochet, CrystEngComm, 2014, 16, 9915.
without porosity. The structure of 4 contains a discrete dinu- 12 Y. M. Klein, E. C. Constable, C. E. Housecro and
clear complex, in contrast to those of 1 and 3. The mononuclear A. Prescimone, Inorg. Chem. Commun., 2014, 49, 41.
Zn(OAc) } motif observed in 2 connects to ligand L2 to result in 13 E. C. Constable, C. E. Housecro, A. Prescimone, S. Vujovic
the 1-D helical chain. This is in contrast to the structure as seen and J. A. Zampese, CrystEngComm, 2014, 16, 8691.
in 5, in which the {ZnI } units assemble ligand L4 into a wave- 14 Y. M. Klein, E. C. Constable, C. E. Housecro and
{
2
2
like polymeric chain with no helical twisting.
All zinc(II) coordination assembles were evaluated as cata- 15 F. Yuan, X. Wang, H.-M. Hu, S.-S. Shen, R. An and G.-L. Xue,
lysts for the transesterication of phenyl acetate with alcohols. Inorg. Chem. Commun., 2014, 48, 26.
The results indicated that compound 1 was the most active 16 E. C. Constable, C. E. Housecro, S. Vujovic and
catalyst, affording the converted ester product in high yield, J. A. Zampese, CrystEngComm, 2014, 16, 328.
while much lower conversions were observed with all other 17 X.-L. Yang, Y.-Q. Shangguan, H.-M. Hu, B. Xu, B.-C. wang,
J. A. Zampese, Polyhedron, 2014, 81, 98.
compounds. We have tentatively attributed this to the fact that
the solid-state structure of 1 contains both non-coordinated
J. Xie, F. Yuan, M.-L. Yang, F.-X. Dong and G.-L. Xue, J.
Solid State Chem., 2014, 216, 13.
terminal pyridine that could act as an internal base for catal- 18 B. Xu, J. Xie, H.-M. Hu, X.-L. Yang, F.-X. Dong, M.-L. Yang
ysis and microporous channels that allow substrates with suit- and G.-L. Xue, Cryst. Growth Des., 2014, 14, 1629.
able molecular sizes to access the metal centres. The interesting 19 P. Yang, M.-S. Wang, J.-J. Shen, M.-X. Li, Z.-X. Wang, M. Shao
structure–catalytic activity relationship found in this work shall and X. He, Dalton Trans., 2014, 43, 1460.
shed lights on the design of more active, selective coordination 20 M.-S. Wang, M.-X. Li, X. He, M. Shao and Z.-X. Wang, Inorg.
polymer catalysts based on novel polypyridine ligands. We are Chem. Commun., 2014, 42, 38.
currently in the course of exploring other transition metal 21 E. C. Constable, C. E. Housecro, M. Neuburger, J. Sch ¨o nle,
0
0
00
complexes or coordination polymers of a variety of 4,2 :6 ,4 -tpy
derivatives for catalytic organic transformations.
S. Vujovic and J. A. Zampese, Polyhedron, 2013, 60, 120.
22 E. C. Constable, C. E. Housecro, S. Vujovic, J. A. Zampese,
A. Crochet and S. R. Batten, CrystEngComm, 2013, 15,
1
0068.
Acknowledgements
2
3 E. C. Constable, C. E. Housecro, M. Neuburger, J. Sch ¨o nle,
We thank the American Chemical Society Petroleum Research
S. Vujovic and J. A. Zampese, Polyhedron, 2013, 62, 260.
Fund for a New Investigator Award (#54247-UNI3), a PSC-CUNY 24 A. Winter, G. R. Newkome and U. S. Schubert,
award (no. 67312-0045) from the Research Foundation of the
ChemCatChem, 2011, 3, 1384.
City University of New York and a CUNY Collaborative Incentive 25 N. Kaveevivitchai, R. Chitta, R. Zong, M. El Ojaimi and
Research Grant (CIRG#80209-06) for nancial support. WC R. P. Thummel, J. Am. Chem. Soc., 2012, 134, 10721.
acknowledges the Program for Professor of Special Appoint- 26 D. Chao and W.-F. Fu, Chem. Commun., 2013, 49, 3872.
ment (Eastern Scholar) at Shanghai Institutions of Higher 27 R. Shrestha, S. C. M. Dorn and D. J. Weix, J. Am. Chem. Soc.,
Learning.
2013, 135, 751.
28 K. Kamata, A. Suzuki, Y. Nakai and H. Nakazawa,
Organometallics, 2012, 31, 3825.
Notes and references
2
9 Y. Gao, R. H. Crabtree and G. W. Brudvig, Inorg. Chem., 2012,
51, 4043.
1
C. E. Housecro, Dalton Trans., 2014, 43, 6594 and
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15878 | RSC Adv., 2015, 5, 15870–15879
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