Heptacopper(II) and dicopper(II)-adenine complexes: Synthesis, structural characterization, and magnetic properties

B. J.M. Leite Ferreira; Paula Brandão; A. M. Dos Santos; Z. Gai; C. Cruz; M. S. Reis; T. M. Santos; V. Félix

doi:10.1080/00958972.2015.1061126

Heptacopper(II) and dicopper(II)-adenine complexes: Synthesis, structural characterization, and magnetic properties

B. J.M. Leite Ferreira, Paula Brandão, A. M. Dos Santos, Z. Gai, C. Cruz, M. S. Reis, T. M. Santos, V. Félix

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Abstract

(Chemical Presented). The syntheses, crystal structures, and magnetic properties of two new copper(II) complexes with molecular formulas [Cu₇(μ₂-OH₂)₆(μ₃-O)₆(adenine)₆](NO₃)₂·6H₂O (1) and [Cu₂(μ₂-H₂O)₂(adenine)₂(H₂O)₄](NO₃)₄·2H₂O (2) are reported. The heptanuclear compound is composed of a central octahedral CuO₆ core sharing edges with six adjacent copper octahedra. In 2, the copper octahedra shares one equatorial edge. In both compounds, these basic copper cluster units are further linked by water bridges and bridging adenine ligands through N3 and N9 donors. All copper(II) centers exhibit Jahn-Teller distorted octahedral coordination characteristic of a d⁹ center. The study of the magnetic properties of the heptacopper complex revealed a dominant ferromagnetic intra-cluster interaction, while the dicopper complex exhibits antiferromagnetic intra-dimer interactions with weakly ferromagnetic inter-dimer interaction.

Original language	English
Pages (from-to)	2770-2787
Number of pages	18
Journal	Journal of Coordination Chemistry
Volume	68
Issue number	16
DOIs	https://doi.org/10.1080/00958972.2015.1061126
State	Published - Aug 18 2015

Bibliographical note

Publisher Copyright:
© 2015 Taylor & Francis.

Funding

Thanks are due to the University of Aveiro and CICECO for financial support of this work. B.J.M. Leite-Ferreira acknowledges FCT for her post-doc grant SFRH/BPD/81113/2011. Research at the Oak Ridge National Laboratory’s Spallation Neutron Source and Center for Nanophase Materials Science was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, of the U.S. Department of Energy.

Funders	Funder number
Scientific User Facilities Division
U.S. Department of Energy
Basic Energy Sciences
Oak Ridge National Laboratory
Universidade de Aveiro
Centro de Investigação em Materiais Cerâmicos e Compósitos
Fundação para a Ciência e a Tecnologia	SFRH/BPD/81113/2011

Keywords

Adenine complexes
Copper cluster
Dicopper(II)
Heptacopper(II)
Magnetic properties

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10.1080/00958972.2015.1061126

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title = "Heptacopper(II) and dicopper(II)-adenine complexes: Synthesis, structural characterization, and magnetic properties",

abstract = "(Chemical Presented). The syntheses, crystal structures, and magnetic properties of two new copper(II) complexes with molecular formulas [Cu7(μ2-OH2)6(μ3-O)6(adenine)6](NO3)2·6H2O (1) and [Cu2(μ2-H2O)2(adenine)2(H2O)4](NO3)4·2H2O (2) are reported. The heptanuclear compound is composed of a central octahedral CuO6 core sharing edges with six adjacent copper octahedra. In 2, the copper octahedra shares one equatorial edge. In both compounds, these basic copper cluster units are further linked by water bridges and bridging adenine ligands through N3 and N9 donors. All copper(II) centers exhibit Jahn-Teller distorted octahedral coordination characteristic of a d9 center. The study of the magnetic properties of the heptacopper complex revealed a dominant ferromagnetic intra-cluster interaction, while the dicopper complex exhibits antiferromagnetic intra-dimer interactions with weakly ferromagnetic inter-dimer interaction.",

keywords = "Adenine complexes, Copper cluster, Dicopper(II), Heptacopper(II), Magnetic properties",

author = "{Leite Ferreira}, {B. J.M.} and Paula Brand{\~a}o and {Dos Santos}, {A. M.} and Z. Gai and C. Cruz and Reis, {M. S.} and Santos, {T. M.} and V. F{\'e}lix",

note = "Publisher Copyright: {\textcopyright} 2015 Taylor & Francis.",

year = "2015",

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doi = "10.1080/00958972.2015.1061126",

language = "English",

volume = "68",

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T1 - Heptacopper(II) and dicopper(II)-adenine complexes

T2 - Synthesis, structural characterization, and magnetic properties

AU - Leite Ferreira, B. J.M.

AU - Brandão, Paula

AU - Dos Santos, A. M.

AU - Gai, Z.

AU - Cruz, C.

AU - Reis, M. S.

AU - Santos, T. M.

AU - Félix, V.

PY - 2015/8/18

Y1 - 2015/8/18

N2 - (Chemical Presented). The syntheses, crystal structures, and magnetic properties of two new copper(II) complexes with molecular formulas [Cu7(μ2-OH2)6(μ3-O)6(adenine)6](NO3)2·6H2O (1) and [Cu2(μ2-H2O)2(adenine)2(H2O)4](NO3)4·2H2O (2) are reported. The heptanuclear compound is composed of a central octahedral CuO6 core sharing edges with six adjacent copper octahedra. In 2, the copper octahedra shares one equatorial edge. In both compounds, these basic copper cluster units are further linked by water bridges and bridging adenine ligands through N3 and N9 donors. All copper(II) centers exhibit Jahn-Teller distorted octahedral coordination characteristic of a d9 center. The study of the magnetic properties of the heptacopper complex revealed a dominant ferromagnetic intra-cluster interaction, while the dicopper complex exhibits antiferromagnetic intra-dimer interactions with weakly ferromagnetic inter-dimer interaction.

AB - (Chemical Presented). The syntheses, crystal structures, and magnetic properties of two new copper(II) complexes with molecular formulas [Cu7(μ2-OH2)6(μ3-O)6(adenine)6](NO3)2·6H2O (1) and [Cu2(μ2-H2O)2(adenine)2(H2O)4](NO3)4·2H2O (2) are reported. The heptanuclear compound is composed of a central octahedral CuO6 core sharing edges with six adjacent copper octahedra. In 2, the copper octahedra shares one equatorial edge. In both compounds, these basic copper cluster units are further linked by water bridges and bridging adenine ligands through N3 and N9 donors. All copper(II) centers exhibit Jahn-Teller distorted octahedral coordination characteristic of a d9 center. The study of the magnetic properties of the heptacopper complex revealed a dominant ferromagnetic intra-cluster interaction, while the dicopper complex exhibits antiferromagnetic intra-dimer interactions with weakly ferromagnetic inter-dimer interaction.

KW - Adenine complexes

KW - Copper cluster

KW - Dicopper(II)

KW - Heptacopper(II)

KW - Magnetic properties

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VL - 68

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ER -

Heptacopper(II) and dicopper(II)-adenine complexes: Synthesis, structural characterization, and magnetic properties

Abstract

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Keywords

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