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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Synthesis and crystal structrue of cis-[NiL(en)](ClO_4)_2·en·H_2O· (L = 3-hydroxyethyl-1,3,5,8,12-penta-azacyclotetradecane) and solution studies of the planar-cis-foldng equilibrium
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Synthesis and crystal structrue of cis-[NiL(en)](ClO_4)_2·en·H_2O· (L = 3-hydroxyethyl-1,3,5,8,12-penta-azacyclotetradecane) and solution studies of the planar-cis-foldng equilibrium

机译:顺式[NiL(en)](ClO_4)_2·en·H_2O·(L = 3-羟乙基-1,3,5,8,12-五氮杂环十四烷)的合成和晶体结构及平面结构的溶液研究顺式-折叠平衡

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摘要

The reaction of formaldehyde and ethanolamine with the nickel(II) complex of 1,9-diamino-3..7-diazanonane (2,3.2-tet) in thepresence of triethylamine gives the planar .nickel(II) complex of the penta-azamacrocycle-3-hydroxyethyl-,3.5,8,12-penta-azacy- clotetradecane (L) which can be readily isolated as the perchlorate salt. The reaction of [NiL](ClO_4)1 with 1.2-diaminoethane (en) gives the folded cis-complex[NiL(en)](CIO4)_2-en. H_2O containing a water and a 1,2-diaminoethane of crystalisation. The nickel(ll) centre in the crystal structure is distorted octahedral with Ni-N bond distances to the N( I), N(2), N(3) and N(4) atoms of,.the macrOcycle in the range 2.099(7)-2.129(7) A which are typical of octahedral nickel(ll) complexes with other such azamacrocy~les ligands. The cis orientated Ni-N bond distances to the two N atoms of the 1,2-diaminoethane ligand are however somewhat longer at 2.168(7) and 2.161(7) A. The hydroxyethyl group is axial with the ligand having the trans V stereochemistry of the ciiiral sec-NH centres. The six-membered chelate rings have a chair conformation and the five-membered chelate rings are gauche. The planar-trans-octahedral diaqua equilibrium; [NiL~(2+) + 2H2O [NiL(OH_2)_2]1 + is represented by K, (25°C) = 0.167. ~Ho = -55+-3 kJ mol- I and ~so = -198 +-30 J K- I mol- I. The planar-cis-folded equilibrium: [NiL~(2 +) + en cis-[NiL( en)f + is governed by K2 (25°C) = 417 dm3 mo[-i, ~Ho = -38.5 +- 2 kJ mo.l-1 and ~So = -79+-5 J K -I mol-l. The mechanism ofjtbo planar-folded octahedral equilibrium is discussed.
机译:甲醛和乙醇胺与三乙胺存在下的1,9-二氨基-3..7-二氮杂壬烷(2,3.2-tet)的镍(II)配合物反应生成五azamacrocycle-3-羟乙基-,3.5、8、12-戊基-叠氮基-十四烷(L),可以很容易地以高氯酸盐的形式分离出来。 [NiL](ClO_4)1与1.2-二氨基乙烷(en)的反应得到折叠的顺式复合物[NiL(en)](CIO4)_2-en。 H_2O含有水和结晶的1,2-二氨基乙烷。晶体结构中的镍(ll)中心扭曲成八面体形,并且与macrOcycle的N(I),N(2),N(3)和N(4)原子的Ni-N键距离为2.099 (7)-2.129(7)是典型的八面体镍(II)与其他此类氮杂宏配体的配合物。然而,与1,2,2-二氨基乙烷配体的两个N原子的顺位取向的Ni-N键距离在2.168(7)和2.161(7)A处稍长。羟乙基与具有反式V立体化学的配体是轴向的sec-NH中心。六元螯合环具有椅子构型,五元螯合环为薄纱状。平面反八面体透辉平衡; [NiL〜(2+)+ 2H2O [NiL(OH_2)_2] 1 +用K表示,(25°C)= 0.167。 〜Ho = -55 + -3 kJ mol- I和〜so = -198 + -30 J K- I mol-I。平面-顺式折叠平衡:[NiL〜(2 +)+ en顺式-[NiL (en)f +由K2(25°C)= 417 dm3 mo [-i,〜Ho = -38.5 +-2 kJ mo.l-1和〜So = -79 + -5 JK -I mol- l。讨论了jtbo平面折叠八面体平衡的机理。

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