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Synthesis, Crystal Structures, and Magnetic Properties of Two New 1D Copper( II ) Coordination Polymers Containing Fumarate(−2) and Chelating N,N′‐Donor as Ligands
Author(s) -
Dalai Sudipta,
Mukherjee Partha Sarathi,
Rogez Guillaume,
Mallah Talal,
Drew Michael G. B.,
Chaudhuri Nirmalendu Ray
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200212)2002:12<3292::aid-ejic3292>3.0.co;2-g
Subject(s) - chemistry , crystallography , denticity , orthorhombic crystal system , triclinic crystal system , magnetic susceptibility , crystal structure , copper , monoclinic crystal system , antiferromagnetism , ligand (biochemistry) , stereochemistry , biochemistry , physics , receptor , organic chemistry , condensed matter physics
Two new polynuclear complexes of Cu II , [Cu 2 (fum)(μ‐OH)(bpy) 2 (H 2 O)](NO 3 )·2H 2 O ( 1 ) (fum = fumarate dianion, bpy = 2,2′‐bipyridine) and [Cu(fum)(tmen)]·2H 2 O ( 2 ) (tmen = N , N , N′ , N′ ‐tetramethylethane‐1,2‐diamine), have been synthesized and structurally characterized by X‐ray crystallography. Complex 1 , C 24 H 27 Cu 2 N 5 O 12 , crystallizes in a triclinic system, space group P $\bar 1$ , with a = 10.168(14), b = 11.347(14), c = 14.74(2) Å, and Z = 2; complex 2 , C 10 H 22 CuN 2 O 6 , crystallizes in an orthorhombic system, space group Pbca , with a = 14.701(19), b = 14.899(19), c = 26.90(3) Å, and Z = 16. Compound 1 is an alternating chain compound, with alternate repetition of bis(monodentate) (μ 2 ) and bis(bidentate) (μ 4 ) bridging modes of fumarate, showing ferromagnetic interaction between Cu II ions through hydroxo bridges with a Cu−O−Cu angle of 108.5°. Compound 2 is a linear 1D zig‐zag polymer. There are two copper( II ) ions with equivalent coordination and geometry in the asymmetric unit, each of them bonded to a bidentate tmen ligand and to two different fumarate moieties. Magnetic susceptibility data were measured in the 300−2 K temperature range. The magnetic data for 1 were fitted by use of a ferromagnetic/antiferromagnetic alternating S = 1/2 chain system and show the following results: J F = +5.4 cm −1 , J AF = −0.25 cm −1 , g = 1.96. The susceptibility data of 2 were fitted by use of the Bonner−Fisher expression for antiferromagnetically coupled S = 1/2 local spins, giving the parameters J = −1.81 cm −1 , g = 2.03.