A novel trinuclear mu(3)-hydroxido-bridged Cu(II) compound; a molecular cluster, stabilized by hydrogen bonding, bridging pyrazolates, terminal pyrazoles, water and nitrate anions

作者：Alsalme Ali; Ghazzali Mohamed; Khan Rais Ahmad; Al Farhan Khalid; Reedijk Jan^*

来源：Polyhedron, 2014, 75: 64-67.

DOI：10.1016/j.poly.2014.03.017

• Copper
• Pyrazole
• Hydrogen bonding
• Cluster
• Single crystal diffraction

The synthesis, together with molecular structure and characterization of mu(3)-hydroxidobis(nitrato)tris (mu-pyrazolato)tetrakis(pyrazole)tricopper(11) monohydrate ([Cu-3(OH)(pz)(3)(Hpz)(4)(NO3)(2)](H2O)) is presented and discussed, also in comparison with some related pyrazole nitrate compounds. The peculiar intramolecular hydrogen-bond stabilization for the cluster with as many as 6 intramolecular hydrogen bonds is considered in detail. The non-bonding water solvate bridges between a coordinating nitrate and hydroxide, and intermolecularly with the pyrazole NH from a neighboring unit. Ligand-field, EPR and infrared spectra are discussed in the context of the trinuclear Cu unit. Low-temperature magnetic susceptibility shows a strong antiferromagnetic exchange, resulting in a spin of S = 1/2 at low T, similar to earlier reported related compounds.

• 出版日期2014-6-17