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- W1985333578 abstract "A series of chromium(III) complexes of the forms cis- and/or trans-[CrX2(mac)]+ and [Cr(C2O4)(mac)+ were prepared, where X is F−, Cl−, or B− ion, and mac is 1,4,7,10-tetraazacyclododecane ([12]aneN4), 1,4,7,10-tetraazacyclotridecane ([13]aneN4), 1,4,8,11-tetraazacyclotetradecane ([14]aneN4, cyclam), 1,4,7,11-tetraazacyclotetradecane ([14]aneN4, isocyclam), 1,4,8,12-tetraazacyclopentadecane ([15]aneN4), or 1,5,9,13-tetraazacyclohexadecane ([16]aneN4). When trans-[CrF2(py)4]+ and [CrCl3(thf)3] were used as the starting materials for the preparation of [CrX2(mac)]+ complexes, only cis isomers were formed for [12]- and [13]aneN4, whereas only trans isomers were formed for [15]- and [16]aneN4, irrespective of halide ions. Both cis and trans isomers were isolated for [14]aneN4 (cyclam and isocyclam); cis isomers were more easily obtained than trans isomers for cyclam, and vice versa for isocyclam. cis-[CrCl2([15]- or [16]aneN4)]+ was derived from the reaction of the corresponding [Cr(C2O4([15]- or [16]aneN4)]+with sulphinyl chloride in methanol. [Cr(C2O4)(mac)]+ complexes were prepared by the reaction of the respective dihalogeno complexes with NaHC2O4. Relative ligand field strengths of macs were estimated from Dqxy values for trans-dihalogeno complexes, and Dqav values for cis-dihalogeno and oxalato complexes as follows: cyclam > isocyclam > [15]aneN4 > [16]aneN4 for the trans isomers; cyclam > [15]aneN4 > [16]aneN4 ≈ isocyclam > [13]aneN4 > [12]aneN4 for the cis isomers; cyclam > [15]aneN4 > [13]aneN4 > [16]aneN4 ≈ isocyclam > [12]aneN4 for the oxalato complexes cis-[CrCl2([15]- or [16]aneN4)]+ were found to isomerise thermally to the corresponding trans isomers, even in the solid state." @default.
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- W1985333578 date "1992-01-01" @default.
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- W1985333578 title "Preparation of chromium(III) complexes with a series of tetraazacycloalkanes, [12]aneN4 to [16]aneN4, and solid-state thermal isomerisation of cis-[CrCl2([15]- or [16]aneN4)]+" @default.
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- W1985333578 doi "https://doi.org/10.1016/0040-6031(92)80048-2" @default.
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