Syntheses, molecular and supramolecular structures, electrochemistry and magnetic properties of two macrocyclic dinickel(II) complexes

Autor(en)

Susanta Hazra, Suraj Mondal, Michel Fleck, Sujit Sasmal, E. Carolina Sañudo, Sasankasekhar Mohanta

Abstrakt

The work in this paper reports syntheses, molecular and supramolecular structures, electrochemistry and magnetic properties of two diphenoxo-bridged dinickel(II) compounds [NiII2L(N3)2(H2O)2]·CH3CN (1) and [NiII2L(N3)2(H2O)] (2), where H2L is the tetraimino diphenolate macrocyclic ligand, obtained on [2 + 2] condensation of 4-methyl-2,6-diformylphenol and 2,2'-dimethyl-1,3-diaminopropane. Brown colored compound 1 and green colored compound 2 are produced from the same reaction mixture as a function of temperature; 1 is formed from the reaction mixture in acetonitrile at low temperature (ca. 5 °C), while 2 is formed on heating the reaction mixture in acetonitrile. Crystals of compounds 1 and 2 are monoclinic (space group P21/c) and orthorhombic (space group P212121), respectively. Analyses of the crystal packing of the crystalline phases reveal that two-dimensional topologies are resulted in both 1 and 2 due to hydrogen bonding interactions. Variable-temperature (2–300 K) magnetic susceptibility measurements of the two compounds reveal that the metal centers in both the complexes are coupled by moderate antiferromagnetic interactions with J values (H = -2JS1·S2) -18.8 and -34.2 cm-1 for 1 and 2, respectively. Electrochemical analyses of 2 reveal that this compound exhibits two-step reduction couples at E½ = -977 and -1155 mV.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

University of Calcutta, Universitat Autònoma de Barcelona

Journal

Polyhedron

Band

30

Seiten

1906-1913

Anzahl der Seiten

8

ISSN

0277-5387

Publikationsdatum

2011

Peer-reviewed

Ja

ÖFOS 2012

105113 Kristallographie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/76a8400b-26a1-4217-a7e2-84aed194a08c