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Chiral Pyrimidine Metallacalixarenes:Synthesis,Structure and Host-Guest Chemistry

机译:手性嘧啶金属lacalixarenes:合成,结构和主客体化学

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A set of enantiomerically pure cyclic multinuclear complexes with the formula cis-[a_2PdL]_n~n+[a_2=(R,R)-1,2-diaminocyclohexane(R,R-dach),(S,S)-1,2-diaminocyclohexane(S,S-dach);n=4,6;LH=2-hydroxypyrimidine(2-Hpymo),4,6-dimethyl-2-hydroxy-pyrimidine(2-Hdmpymo)and 4-hydroxypyrimidine(4-Hpymo)]were obtained by reaction of cis-[a_2Pd(H_2O)_2]~2+and LH in aqueous media.The polynuclear complexes were studied by ~H NMR spectroscopy and X-ray crystallography.These tudies revealed that the N1,N3-bridging mode exhibited by the pyrimidine moieties is ideally suited for formation of inorganic analogues of calixarenes(metallacalixarenes)in a self-assembly process.The most stable species are the tetranuclear metallacalix[4]arenas,which are obtained in all cases.Hexanuclear species,namely,[a_2Pd(2-dmpymo)]_6~6+,were also isolated and fully characterized.~1H NMR experiments show conversion of[a_2Pd(2-dmpymo)]_6~6+ to [a_2Pd(2-dmpymo)]_4~4+ on heating.Analogously to organic calixarenes,these systems are also capable of incorporating hard metal ions at the oxo surface.Additionally,investigations on the receptor properties of these metallacalixarenes towards mononucleotides showed that enantioselective recognition processes occur in aqueous media.
机译:一组对映体纯的环状多核配合物,分子式为cis- [a_2PdL] _n〜n + [a_2 =(R,R)-1,2-二氨基环己烷(R,R-dach),(S,S)-1,2 -二氨基环己烷(S,S-dach); n = 4,6; LH = 2-羟基嘧啶(2-Hpymo),4,6-二甲基-2-羟基嘧啶(2-Hdmpymo)和4-羟基嘧啶(4-顺式[a_2Pd(H_2O)_2]〜2 +与LH在水介质中反应制得Hpymo)]。通过〜H NMR光谱和X射线晶体学研究了多核配合物。这些结果表明,N1,N3嘧啶基团所表现出的-桥联模式非常适合在自组装过程中形成杯芳烃(metallacalixarenes)的无机类似物。最稳定的物种是四核金属lacalix [4]竞技场,在所有情况下都可获得。 ,也分离出[a_2Pd(2-dmpymo)] _ 6〜6 +并进行了充分表征。〜1H NMR实验表明,[a_2Pd(2-dmpymo)] _ 6〜6 +转化为[a_2Pd(2-dmpymo) ] _4〜4 +加热。类似于有机杯芳烃,这些系统另外,对这些金属lacalixarenes对单核苷酸的受体性质的研究表明,对映选择性识别过程发生在水性介质中。

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