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An investigation into luminescent phenoxo-bridged heterobimetallic copper(II)–calcium(II)/strontium(II)-based bis(salamo)-like complexes.
- Source :
- Transition Metal Chemistry; Jan2022, Vol. 47 Issue 1, p53-65, 13p
- Publication Year :
- 2022
-
Abstract
- Two luminescent hetero-trinuclear complexes [Cu<subscript>2</subscript>Ca(L)(µ<subscript>2</subscript>-NO<subscript>3</subscript>)<subscript>2</subscript>] (1) and [{Cu<subscript>2</subscript>Sr(L)(µ<subscript>2</subscript>-NO<subscript>3</subscript>)(ƞ<superscript>2</superscript>-NO<subscript>3</subscript>)}<subscript>2</subscript>]·2EtOH·H<subscript>2</subscript>O (2) have been prepared by a flexible bis(salamo)-based ligand (H<subscript>4</subscript>L) with Cu(NO<subscript>3</subscript>)·3H<subscript>2</subscript>O and M(OAc)<subscript>2</subscript>·nH<subscript>2</subscript>O (M(II) = Sr, n = 2; Ca, n = 1), respectively. The structural characterizations were performed by physicochemical and spectroscopic methods. Two penta-coordinate Cu(II) atoms of complex 1 are sited at the N<subscript>2</subscript>O<subscript>2</subscript>-donor coordination environments of the (L)<superscript>4−</superscript> moiety, while tetra- and penta-coordinate Cu(II) atoms in complex 2 are also located in the N<subscript>2</subscript>O<subscript>2</subscript> cavities of the (L)<superscript>4−</superscript> unit. Ca(II) and Sr(II) atoms are located in various O<subscript>8</subscript> and O<subscript>9</subscript> cavities, respectively. In the solid state, infinite 3D supra-molecular structures are formed in complexes 1 and 2 through the abundant intermolecular hydrogen bonds and π···π interactions. These interactions were quantitatively analyzed by Hirshfeld surface analyses. DFT calculations and fluorescence properties showed that complexes 1 and 2 have stable chemical properties and good luminescence properties. Two hetero-trinuclear complexes [Cu<subscript>2</subscript>Ca(L)(µ<subscript>2</subscript>-NO<subscript>3</subscript>)<subscript>2</subscript>] (1) and [{Cu<subscript>2</subscript>Sr(L)(µ<subscript>2</subscript>-NO<subscript>3</subscript>)(ƞ<superscript>2</superscript>-NO<subscript>3</subscript>)}2]·2EtOH·H<subscript>2</subscript>O (2) have been synthesized and characterized structurally. Two penta-coordinate Cu(II) atoms in complex 1 are located in the N<subscript>2</subscript>O<subscript>2</subscript> cavities of the (L)<superscript>4−</superscript> unit, while tetra- and penta-coordinate Cu(II) atoms in complex 2 are also located in the N<subscript>2</subscript>O<subscript>2</subscript> cavities of the (L)<superscript>4−</superscript> unit. There are eight and nine oxygen donor atoms coordinating to the Ca(II) and Sr(II) atoms. Infinite 3D supra-molecular structures are formed in complexes 1 and 2 through the intermolecular hydrogen bonds and π···π stacking interactions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03404285
- Volume :
- 47
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Transition Metal Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 155080317
- Full Text :
- https://doi.org/10.1007/s11243-021-00489-x