溶液中N-乙酸基取代氮氧杂大环及其配合物稳定性研究

用pH电位滴定法在25℃,0.5mol·L~(-1)KNO_3水溶液中测定了三种大环化合物:H_2L~1(1,12-二氮杂-3,4:9,10-二苯并-5,8-二氧杂环十五烷-N,N＇-二乙酸);H_3L~2(1,12,15-三氮杂-3,4:9,10-二苯并-5,8-二氧杂环十七烷-N,N＇,N″-三乙酸)和H_2L~3(1,15-二氮杂-3,4:12,13-二苯并-5,8,11-三氧杂环十八烷-N,N′-二乙酸)的逐级质子化常数.又测定了它们与Cu~(2+)、Ni~(2+)、Pb~(2+)配合物的稳定常数,以及H_2L~3与镧系金属La~(3+)、Pr~(3+)、Nd~(3+)、Eu~(3+)、Sm~(3+)、Gd~(3+)、Dy~(3+)、Yb~(3+)配合物的稳定常数.讨论了三种大环化合物质子化的一般顺序及其与各种离子配位时稳定性选择规律.说明了影响配位稳定性的有关因素.     

Synthesis of functional polymers with acetal-monosaccharide moieties

The polycondensation of methyl α-D-mannopyranoside ( 1 ) with 1,n-bis(formylphenoxy)alkanes ( 2 ), using acidic catalysts, leads to the formation of linear polymers and macrocyclic compounds. The structure of the polymer and macrocycles was determined by ¹H, ¹³C NMR spectroscopy and ESI-MS analysis.     

Crystal Structure of the Amine‐Carbonato‐Cobalt(III) Complex [Co(CO3)(L1)]ClO4 with Aminoalkyl Pendant‐Arm [12]eneN4, L1 = 9‐(3‐aminopropyl)‐1,5,9‐Triazacyclododecene

The crystal and molecular structure of the title complex [Co(CO3)(L1)]ClO4 was determined from X‐ray diffraction data using direct methods. The crystals are monoclinic, a = 13.588(4) Å, b = 9.049(3) Å, c = 15.569(6) Å, β = 114.75(2)°, Z = 4, V = 1738.5(10) ų, space group P21/n. The structure consists of isolated [Co(CO3)(C12H26N4)]+ complex cations, with distorted octahedral geometry and ClO4‐ counter anions. The results are discussed in relation to similar macrocycle and carbonato analogues.