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Magnetic dimensionality and the crystal structure of two copper(ii) coordination polymers containing Cu6 and Cu2 building units.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 8/14/2019, Vol. 48 Issue 30, p11421-11432, 12p
- Publication Year :
- 2019
-
Abstract
- The electrostatic self-assembly reaction of the [Cu(HL)]<superscript>2+</superscript> cation, where HL = 2-(2-aminoethylamino) ethanol, and the N<subscript>3</subscript><superscript>−</superscript> or [Fe(CN)<subscript>6</subscript>]<superscript>4−</superscript> anion leads to the formation of two coordination polymers with the general formula of [Cu<subscript>6</subscript>(μ<subscript>1,1</subscript>-N<subscript>3</subscript>)<subscript>6</subscript>(μ<subscript>1,3</subscript>-N<subscript>3</subscript>)<subscript>2</subscript>(μ<subscript>1,1,3</subscript>-N<subscript>3</subscript>)<subscript>2</subscript>(μ<subscript>1,1,1,3</subscript>-N<subscript>3</subscript>)<subscript>2</subscript>(HL)<subscript>2</subscript>]<subscript>n</subscript> (1) and {[Cu(HL)]<subscript>2</subscript>[Fe(CN)<subscript>6</subscript>]·H<subscript>2</subscript>O}<subscript>n</subscript> (2), respectively. The resulting compounds have been structurally characterized by a single-crystal X-ray diffraction technique. Compound 1 possesses a rare 3D structure. It contains centrosymmetric hexanuclear repeating units, which act as six-connected nodes in the final network and copper(ii) ions are joined together by azide anions with four different types of bridging modes, μ<subscript>1,1</subscript>, μ<subscript>1,1,3</subscript>, μ<subscript>1,1,1,3</subscript>, and μ<subscript>1,3</subscript>. The structure of compound 2 is a 2D heterometallic Cu<superscript>II</superscript>/Fe<superscript>II</superscript> layer in which the [Cu(HL)]<subscript>2</subscript> nodes and the octahedral [Fe(CN)<subscript>6</subscript>]<superscript>4−</superscript> linkers are joined by μ<subscript>2</subscript>- and unusual μ<subscript>3</subscript>-CN bridging modes. Detailed static and dynamic magnetic analyses of 1 reveal a dominant ferromagnetic intracluster interaction and a ferromagnetic 3D ordering transition below T<subscript>c</subscript> = 5 K. The variable temperature magnetic susceptibility measurements of compound 2 show a very weak ferromagnetic coupling between the nearest Cu(ii) ions. Also, EPR spectroscopy of these compounds has been investigated in the solid state. Nanocrystals of compound 2 have also been synthesized by a sonochemical process under different reaction conditions. The results show that the crystallinity degree and uniform distribution of nanosheets are inversely dependent on the irradiation time. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 48
- Issue :
- 30
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 137799281
- Full Text :
- https://doi.org/10.1039/c9dt01728c