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• W2022045707 abstract "The dark blue dimeric complex di-μ-hydroxo- bis [(1,4,7,10-tetraazacyclododecane)chromium(III)] dithionate tetrahydrate, [Cr(C8H20N4)OH]2(S2O6)2· 4H2O or [Cr(cyclen)OH]2(S2O6)2·4H2O, has been synthesized. The crystal structure of the complex has been determined from threeodimensional counter X-ray data. The complex crystallizes in space group P21/n of the monoclinic system with two dimeric formula units in a cell of dimensions a = 8.837(5), b = 14.472(8), c= 13.943(6) Å andβ=95.83(4)o. The structure has been refined by full-matrix least- squares methods to a final value of the weighted R-factor of 0.059 on the basis of 1774 independent intensities. The geometry of the cyclen macrocycle is unsymmetrical, the observed conformations being λδδλ and its enantiomer. The strained ligand conformation leads to significant deviations from octahedral geometry at the chromium centers, and to a bridged geometry in which the CrOCr angle ø and the Cr···Cr separation of 104.1(1)o and 3.086(2) Å are the largest observed in dimers of this kind. The magnetic susceptibility of the complex indicates antiferromagnetic coupling, with the ground state singlet lying 21.56(6) cm−1 below the lowest lying triplet state. The structural parameters have been used to calculate the triplet energy by means of the Glerup- Hodgson- Pedersen (GHP) model, and the calculated value of 22.3 cme−1 is very similar to the observed value." @default.
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• W2022045707 date "1986-10-01" @default.
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• W2022045707 title "Synthesis, structure and magnetic properties of the binuclear chromium(III) complex di-μ-hydroxobis [(1,4,7,10-tetraazacyclododecane)chromium(III)] dithionate tetrahydrate, [(cyclen)CrOH]2(S206)2·4H2O" @default.
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• W2022045707 doi "https://doi.org/10.1016/s0020-1693(00)86106-x" @default.
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