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Selective recognition of Fe3+ and CrO42− ions using a Zn(II) metallacycle and a Cd(II) coordination polymer and their heterogeneous catalytic application.
- Source :
- CrystEngComm; 12/28/2019, Vol. 21 Issue 48, p7447-7459, 13p
- Publication Year :
- 2019
-
Abstract
- We report the syntheses and structural characterization of a Zn(II) metallacycle [Zn<subscript>2</subscript>{(L)<subscript>2</subscript>(DMF)<subscript>2</subscript>(NO<subscript>3</subscript>)<subscript>2</subscript>}]·(NO<subscript>3</subscript>)<subscript>2</subscript> (1) along with a Cd(II) coordination polymer [{Cd<subscript>1</subscript>(L)<subscript>2</subscript>(DMF)<subscript>2</subscript>}·(NO<subscript>3</subscript>)<subscript>2</subscript>]<subscript>n</subscript> (2) (where L = N,N′-bis-(3-pyridyl)terephthalamide; DMF = dimethylformamide) and their utilization as fluorescent probes for highly selective recognition (turn-off) of Fe<superscript>3+</superscript> and CrO<subscript>4</subscript><superscript>2−</superscript> ions. Compounds 1 and 2 were prepared by utilizing ligand L and the nitrate salt of zinc and cadmium, respectively. Single crystal X-ray analysis reveals that 1 adopts an overall Zn(II) metallacycle architecture, whereas 2 displays a one-dimensional (1D) polymeric structure. Both 1 and 2 showed high fluorescence stability in aqueous solution and selectively detected Fe<superscript>3+</superscript> and CrO<subscript>4</subscript><superscript>2−</superscript> ions with high quenching constants and low detection limits of 2.34 × 10<superscript>6</superscript> M<superscript>−1</superscript> and 0.153 μM for Fe<superscript>3+</superscript>, 6.72 × 10<superscript>5</superscript> and 0.205 μM for CrO<subscript>4</subscript><superscript>2−</superscript> (for 1); 3.25 × 10<superscript>6</superscript> and 0.193 μM for Fe<superscript>3+</superscript>, 6.94 × 10<superscript>5</superscript> and 0.155 μM for CrO<subscript>4</subscript><superscript>2−</superscript> (for 2). Notably, ligand L itself did not display any type of recognition for any ions in DMF as well as in aqueous media. Moreover, 1 and 2 were also employed as heterogeneous catalysts for the ring-opening reaction (ROR) of epoxides with various assorted amines and up to 95% yield (TON, 47.5 and TOF, 11.9 h<superscript>−1</superscript>) was observed with perfect regioselectivity in the case of styrene oxide. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14668033
- Volume :
- 21
- Issue :
- 48
- Database :
- Complementary Index
- Journal :
- CrystEngComm
- Publication Type :
- Academic Journal
- Accession number :
- 140273523
- Full Text :
- https://doi.org/10.1039/c9ce01357a