A rare doubly nitrato and phenoxido bridged trimetallic CuII complex: EPR, antiferromagnetic coupling and theoretical rationalization

Amitabha Datta; Kuheli Das; Sandeep B. Mane; Shruti Mendiratta; Mohamed Salah El Fallah; Eugenio Garribba; Antonio Bauzá; Antonio Frontera; Chen-Hsiung Hung; Chittaranjan Sinha

doi:10.1039/C6RA10674A

A rare doubly nitrato and phenoxido bridged trimetallic Cu^II complex: EPR, antiferromagnetic coupling and theoretical rationalization†

Amitabha Datta,*^a Kuheli Das,^ab Sandeep B. Mane,^a Shruti Mendiratta,^a Mohamed Salah El Fallah,^c Eugenio Garribba,^d Antonio Bauzá,^e Antonio Frontera,

*^e Chen-Hsiung Hung*^a and Chittaranjan Sinha^b

Author affiliations

* Corresponding authors

^a Institute of Chemistry, Academia Sinica, Nankang, Taipei – 115, Taiwan
E-mail: amitd_ju@yahoo.co.in, chhung@gate.sinica.edu.tw

^b Department of Chemistry, Jadavpur University, Kolkata – 700032, India

^c Departament de Química Inorgànica, Facultat de Química, Universitat de Barcelona, Martí i Franquès, 1-11 08028 Barcelona, Catalunya, Spain

^d Dipartimento di Chimica e Farmacia, Università di Sassari, Via Vienna 2, I-07100 Sassari, Italy

^e Departament de Química, Universitat de les Illes Balears, Crta de Valldemossa km 7.5, 07122 Palma de Mallorca, Baleares, Spain
E-mail: toni.frontera@uib.es

Abstract

A rare trimetallic Cu^II complex, [Cu₃(L)₂(NO₃)₂] (1) has been afforded incorporating a [CuL] metalloligand, [where H₂L = N,N′-bis(salicylidene)-1,3-propanediamine]. In 1, in addition to the double phenoxido bridge, the two terminal Cu^II atoms are linked to the central Cu^II by means of syn–anti bridging nitrate anions giving rise to a linear arrangement. Complex 1 exhibits strong antiferromagnetic coupling and shows an χ_MT value of 0.703 cm³ mol⁻¹ K at 300 K. DFT computational studies reveal that there is a clear magneto-structural correlation between the Cu–O–Cu angle and the J_Cu–Cu values, which is in accordance with the experimental evidence. The biological effect of 1 on the viability of different human carcinoma cells was evaluated using MTT assay and the results indicate that this complex induces a decrease in cell-population growth of human colorectal carcinoma cells (COLO 205) with apoptosis.

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A rare doubly nitrato and phenoxido bridged trimetallic Cu^II complex: EPR, antiferromagnetic coupling and theoretical rationalization†

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A rare doubly nitrato and phenoxido bridged trimetallic CuII complex: EPR, antiferromagnetic coupling and theoretical rationalization†

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A rare doubly nitrato and phenoxido bridged trimetallic CuII complex: EPR, antiferromagnetic coupling and theoretical rationalization

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A rare doubly nitrato and phenoxido bridged trimetallic Cu^II complex: EPR, antiferromagnetic coupling and theoretical rationalization†

A rare doubly nitrato and phenoxido bridged trimetallic Cu^II complex: EPR, antiferromagnetic coupling and theoretical rationalization