Tsalen- and Tsalpn-Based Nickel Complexes with Two Aldehyde Functionalities as Potential Synthons for Thiophenolate-Containing Di- and Polynucleating Acyclic and Macrocyclic Ligands
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Tsalen- and tsalpn-based nickel complexes with aldehydefunctionalities have been prepared (tsalen =N,N'-ethylenebis(thiosalicylideneaminato)2- and tsalpn =N,N'-propane-1,3-diyl(thiosalicylideneaminato)2-).One ofthe complexes has been structurally characterized: Ni(pftp)(pftp = N,N-ethylene(6-formyl-4-methyl-2-methyliminatothiophenolato)2-) crystallizes in themonoclinic space group C2/c with a =28.761(7), b = 8.582(2), c = 7.841(4) Å; = 98.92(3), andZ = 4. Ni(pftp) and Ni(eftp) (efpt =N,N-ethylene(6-formyl-4-methyl-2-methyliminatothiophenolato)2-) were used as synthons foracyclic and macrocyclic complexes and a prototypeof each has been structurally characterized. The Schiff basederivative of Ni(pftp) and2-(2-aminoethyl)pyridinegives the acyclic complex, Ni(peptp) (peptp=N,N-propane-1,3-diyl(6-(N-(2-ethylpyridyl)iminomethyl)-4-methyl-2-methyliminatothiophenolato)-) with the two ethylpyridylarms furnishing an "open site", which in this complexis vacant, and a "closed site", in which the Ni2+ islocated. Ni(peptp) crystallizes in the monoclinic spacegroupP21/n with a =10.247(7), b = 21.886(8), c =15.662(9) Å; = 92.58(6), and Z = 4.Schiff base condensationof Ni(pftp) with diaminopropane gave two different macrocyclicdinickel complexes[L1Ni2](ClO4)2and L2Ni2.L1 and L2 are the 2 + 2 and 4 + 4macrocycles, respectively, comprising two propylenediamine and twothiocresolunits and four propylenediamine and four thiocresol units,respectively. Crystals of L2Ni2(L2 = (10,23,36,49-tetramethyl-13,26,39,52-tetramercapto-2,6,15,19,28,32,41,45-octaaza-1,7,14,20,27,33,40,46-octaene[7.7.7.7]metacyclophane) are of poor quality and crystallize in theC2/c space group with a =31.517(14), b =8.980(2),c = 26.822(12) Å; = 117.17(2), andZ = 4.

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