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Seven luminescent metal–organic frameworks constructed from 5-(triazol-1-yl)nicotinic acid: luminescent sensors for CrVI and MnO4− ions in an aqueous medium.
- Source :
- New Journal of Chemistry; 6/21/2018, Vol. 42 Issue 12, p9865-9875, 11p
- Publication Year :
- 2018
-
Abstract
- Seven new luminescent metal–organic frameworks (LMOFs), [Cd<subscript>1.5</subscript>(L)<subscript>2</subscript>(H<subscript>2</subscript>O)(NO<subscript>3</subscript>)]<subscript>n</subscript> (1), [Cd(L)<subscript>2</subscript>(H<subscript>2</subscript>O)<subscript>2</subscript>]<subscript>n</subscript> (2), [Pb(L)(H<subscript>2</subscript>O)<subscript>2</subscript>(NO<subscript>3</subscript>)]<subscript>n</subscript> (3), [Pb(L)<subscript>2</subscript>(H<subscript>2</subscript>O)]<subscript>n</subscript> (4), [Zn(L)<subscript>2</subscript>(H<subscript>2</subscript>O)<subscript>4</subscript>]<subscript>n</subscript> (5), [Zn<subscript>2</subscript>(L)(btc)(H<subscript>2</subscript>O)<subscript>2</subscript>]<subscript>n</subscript> (6) and {[Zn(L)(p-bdc)<subscript>0.5</subscript>(H<subscript>2</subscript>O)](p-H<subscript>2</subscript>bdc)<subscript>0.5</subscript>}<subscript>n</subscript> (7), were assembled employing 5-(triazol-1-yl)nicotinic acid (HL) with Cd(ii), Pb(ii) and Zn(ii) ions, revealing versatile frameworks as well as various types of coordination modes of HL. Single-crystal X-ray diffraction analyses reveal the different dimensionalities (0D, 1D, 2D or 3D) of complexes 1–7. Complex 1 displays a 3D dense-packing structure with a 3-nodal 3,4,6-connected net with a symbol of {4·6<superscript>4</superscript>·8}<subscript>2</subscript>{4·<superscript>2</superscript>·6<superscript>4</superscript>·8<superscript>9</superscript>}{6<superscript>2</superscript>·8}<subscript>2</subscript>. Complex 2 presents a 2D layered structure with a uninodal 4-connected sql net with a symbol of (4<superscript>4</superscript>·6<superscript>2</superscript>). Complex 3 shows a 1D chain based on [Pb<subscript>2</subscript>(COO)<subscript>2</subscript>(H<subscript>2</subscript>O)<subscript>4</subscript>(NO<subscript>3</subscript>)<subscript>2</subscript>N<subscript>2</subscript>] secondary building units (SBUs) and 4 exhibits a 1D dimeric chain. Complex 5 is a 0D structure. Complexes 6 and 7 display 2D layered structures based on binuclear [Zn<subscript>2</subscript>(COO)<subscript>4</subscript>(H<subscript>2</subscript>O)<subscript>2</subscript>N<subscript>2</subscript>] SBUs, which are designated as a 4-nodal 3,3,3,6-connected net with a symbol of {4·6<superscript>2</superscript>}<subscript>2</subscript>{4<superscript>2</superscript>·6<superscript>10</superscript>·8<superscript>3</superscript>}{6<superscript>3</superscript>}<subscript>4</subscript> and a 4-connected sql net, respectively. Further, the solid-state luminescence properties of the complexes were measured at room temperature. Meanwhile, 2 shows high selectivity and sensitivity for CrO<subscript>4</subscript><superscript>2−</superscript>, Cr<subscript>2</subscript>O<subscript>7</subscript><superscript>2−</superscript> and MnO<subscript>4</subscript><superscript>−</superscript> ions by luminescence quenching effect with low detection limits, and the mechanisms of the quenching effect are discussed in detail. [ABSTRACT FROM AUTHOR]
- Subjects :
- NIACIN
LUMINESCENCE
AQUEOUS solutions
Subjects
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 42
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 130097793
- Full Text :
- https://doi.org/10.1039/c8nj01144c