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- W2094511201 abstract "Abstract The hexadentate ligand N , N ′, N ″-tris(2-pyridylmethyl)- cis , cis -1,3,5-triaminocyclohexane (tachpyr) forms stable metal complexes from the salts M(ClO 4 ) 2 ·6H 2 O (M=Zn 2+ and Cd 2+ ) and Hg(ClO 4 ) 2 in methanol or ethanol. The complexes [Zn(tachpyr)](ClO 4 ) 2 ·CH 3 OH ( 1 ·CH 3 OH), [Cd(tachpyr)](ClO 4 ) 2 ( 2 ) and [Hg(tachpyr)](ClO 4 ) 2 ( 3 ) have been isolated, and their solid state structures have been determined and analyzed. The coordination sphere changes from octahedral to trigonal-prismatic geometry with increasing metal radius. The trigonal twist angles ( α ) are 43.7(2)° in compound 1 ·CH 3 OH, range between 11.0(4)° and 21.7(2)° in compound 2 and range between 3.1(3)° and 5.5(2)° in compound 3 . To accommodate larger metal ions there is also a slight outward expansion of the triaminocyclohexane nitrogens, which leads to a reduction in the average cyclohexyl ring C–C–C–C torsion angles ( β ) with concomitant flattening of the ring. The torsion angles ( β ) in 1 ·CH 3 OH are 52.3(6)° and 52.4(6)°, range between 46.1(9)° and 52.7(9)° in compound 2 and range between 45.1(6)° and 52.9(7)° in compound 3 ." @default.
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- W2094511201 date "2000-05-01" @default.
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- W2094511201 title "Effect of metal size on coordination geometry of N,N′,N″-tris(2-pyridylmethyl)-cis,cis-1,3,5-triaminocyclohexane: synthesis and structure of [MIIL](ClO4)2 (M=Zn, Cd and Hg)" @default.
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- W2094511201 doi "https://doi.org/10.1016/s0277-5387(00)00380-6" @default.
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