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Coordination ability of amino acid hydrazide ligands and their influence on magnetic properties in copper(II) coordination polymers


(Institute of Nanotechnology, Karlsruhe Institute of Technology) Androš Dubraja, Lidija; Jerić, Ivanka; Puškarić, Andreas; Bronić, Josip; Moreno-Pineda, Eufemio
Coordination ability of amino acid hydrazide ligands and their influence on magnetic properties in copper(II) coordination polymers // Crystengcomm, 20 (2018), 17; 2396-2403 doi:10.1039/C8CE00210J (međunarodna recenzija, članak, znanstveni)


Naslov
Coordination ability of amino acid hydrazide ligands and their influence on magnetic properties in copper(II) coordination polymers

Autori
Androš Dubraja, Lidija ; Jerić, Ivanka ; Puškarić, Andreas ; Bronić, Josip ; Moreno-Pineda, Eufemio

Kolaboracija
Institute of Nanotechnology, Karlsruhe Institute of Technology

Izvornik
Crystengcomm (1466-8033) 20 (2018), 17; 2396-2403

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Amino acid ; Hydrazide ; Coordination polymer ; Copper, Antiferromagnetic exchange interaction

Sažetak
Newly synthesized amino acid hydrazide ligands (L1 = N, N′-di-L-leucine hydrazide ; L2 = N, N′-di-L-phenylalanine hydrazide) have shown excellent reactivity and stability, as well as extraordinary coordination ability. Reactions of L1/L2 with copper(II) ions and 4, 4′-bipyridine (4, 4′-bpy) as a secondary spacer yielded new coordination polymers {; ; Cu(L1)0.5(4, 4′-bpy)(H2O)(NO3)}; ; n·1.5nH2O (1) and {; ; Cu3(L2)2(4, 4′-bpy)(H2O)2}; ; n(NO3)2n·3nH2O (2). UV/vis spectroscopy together with structural analysis showed that the deprotonated ligands L12−/L22− with six available donor atoms per ligand have the ability for strong chelation to copper(II) ions, acting as bis-bidentate (L12−) and bridging bi + tridentate (L22−) ligands. Compound 1 contains copper(II) ions simultaneously bridged with short hydrazide bridges (4.725 Å) and long 4, 4′-bpy spacers (11.144 Å) forming a two-dimensional coordination network. In compound 2, a pair of L22− molecules bridges three copper(II) ions, which are further interconnected with 4, 4′-bpy into an overall one-dimensional chain-like structure. Although bulkier, the phenylalanine ligand (L2) was found to be more flexible compared to the leucine ligand (L1), exhibiting additional intramolecular contact: cation–π interaction. In both compounds, the hydrazide (–N–N–) bridge mediates the antiferromagnetic interaction between copper(II) ions. Hydrogen bonds have a strong influence on the crystal packing and physical (magnetic) properties. The reported compounds are first examples of hydrazide-bridged metal centres featuring amino acid-based ligands.

Izvorni jezik
Engleski

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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