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Title: Molecular enneanuclear CuII phosphates containing planar hexanuclear and trinuclear sub-units: syntheses, structures, and magnetism
Author: Santra, Biswajit
Kalita, Pankaj
Chandra, Shubhadeep
Mandal, Debdeep
Kumar, Vierandra
Narayanan, Surya
Dey, Atanu
Crysochos, Nicolas
Huch, Volker
Biswas, Sourav
Ghoshal, Debajyoti
Sañudo Zotes, Eva Carolina
Sarkar, Biprajit
Schulzke, Carola
Chandrasekhar, Vadapalli
Jana, Anukul
Keywords: Fosfats
Síntesi inorgànica
Estructura molecular
Inorganic synthesis (Chemistry)
Molecular structure
Issue Date: 17-Feb-2020
Publisher: Royal Society of Chemistry
Abstract: Highly symmetric enneanuclear copper(II) phosphates [Cu9(Pz)6(μ-OH)3(μ3-OH)(ArOPO3)4(DMF)3] (PzH =pyrazole, Ar = 2,6-(CHPh2)2-4-R-C6H2; R = Me, 2MeAr; Et, 2EtAr; iPr, 2iPrAr; and Ar = 2,6-iPr2C6H3, 2Dip) comprising nine copper(II) centers and pyrazole, hydroxide and DMF as ancillary ligands were synthesized by a reaction involving the arylphosphate monoester, 1, copper(I)chloride, pyrazole, and triethylamine in a 4 : 9 : 6 : 14 ratio. All four complexes were characterized by single crystal structural analysis. The complexes contain two distinct structural motifs within the multinuclear copper scaffold: a hexanuclear unit and a trinuclear unit. In the latter, the three Cu(II) centres are bridged by a µ3-OH. Each pair of Cu(II) centers in the trinuclear unit are bridged by a pyrazole ligand. The hexanuclear unit is made up of three dinuclear Cu(II) motifs where the two Cu(II) centres are bridged by an -OH and a pyrazole ligand. The three dinuclear units are connected to each other by phosphate ligands. The latter also aid the fusion of the trinuclear and the hexanuclear motifs. Magnetic studies reveal a strong antiferromagnetic exchange between the Cu(II) centres of the dinuclear units in the hexanuclear part and a strong spin frustration in the trinuclear part leading to a degenerate ground state.
Note: Versió postprint del document publicat a:
It is part of: Dalton Transactions, 2020, vol. 49, p. 2527-2536
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ISSN: 1477-9226
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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