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Self‐assembly of a Novel trans ‐Oxamidato‐bridged Copper(II) Compound with a Neutral Oxamidate‐Ester Ligand as a Spacer. Crystal Structure, Spectroscopy, and Magnetism of a Chain of Dinuclear Units
Author(s) -
van Albada Gerard A.,
Mohamadou Aminou,
Reedijk Jan,
Kooijman Huub,
Spek Anthony L.
Publication year - 2003
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200300207
Subject(s) - crystallography , chemistry , ligand (biochemistry) , triclinic crystal system , magnetic susceptibility , perchlorate , crystal structure , antiferromagnetism , octahedron , molecule , stereochemistry , ion , biochemistry , physics , receptor , organic chemistry , condensed matter physics
The structural, spectroscopic and magnetic properties of a new dinuclear‐based polymeric oxamidato‐bridged Cu II compound, [Cu 2 (H 2 oxen)(oxen)(H 2 O)(ClO 4 ) 2 ] n (C 2 H 6 O) 2n (in which H 2 oxen = N, N′ ‐bis(2‐aminoethyl)oxamide) is reported. The X‐ray structure analysis reveals the triclinic space group P1¯ with a = 7.0857(10) , b = 10.333(2), c = 11.285(2)Å, α = 71.599(7), β = 83.047(7), γ = 83.238(8)°, Z = 2. The coordination around the Cu II ion is distorted octahedral, the basal plane is formed by two N atoms and one O atom of the deprotonated ligand (distances in the range 1.919(2), 2.028(2)Å) and one N‐atom of the second ligand, which acts as the “spacer” ligand (Cu‐N distance 1.971(2)Å). The apical positions are occupied by a water molecule (Cu‐O1 distance 2.445(2)Å) and an O atom of a perchlorate anion at a semi‐coordination distance of 2.912(2)Å. The dinuclear units are connected with a H 2 oxen ligand forming an indefinite 2‐D polymeric array. The Cu‐Cu separation through trans ‐oxen ligand within de dinuclear entity is 5.2548(11)Å and the Cu‐Cu‐ separation through the H 2 oxen‐spacer ligand is 11.458(2)Å. Magnetic susceptibility measurements have been performed over a temperature range of 5‐350 K and resulted in an antiferromagnetic behaviour with a singlet‐triplet energy gap J = ‐558.1 cm ‐1 .