Department of Chemistry, Zakir Husain College, University of Delhi, JL Nehru Marg, New Delhi 110002, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 Feb;75(2):835-40. doi: 10.1016/j.saa.2009.12.009. Epub 2009 Dec 6.
The lanthanide complexes derived from (3,5,13,15-tetramethyl 2,6,12,16,21-22-hexaazatricyclo[15.3.I(1-17)I(7-11)]cosa-1(21),2,5,7,9,11(22),12,15,17,19-decane) were synthesized. The complexes were found to have general composition [Ln(L)X(2).H(2)O]X, where Ln=La(3+), Ce(3+), Nd(3+), Sm(3+) and Eu(3+) and X=NO(3)(-) and Cl(-). The ligand was characterized by elemental analyses, IR, Mass, and (1)H NMR spectral studies. All the complexes were characterized by elemental analyses, molar conductance measurements, magnetic susceptibility measurements, IR, Mass, electronic spectral techniques and thermal studies. The ligand acts as a hexadentate and coordinates through four nitrogen atoms of azomethine groups and two nitrogen of pyridine ring. The lanthanum complexes are diamagnetic while the other Ln(III) complexes are paramagnetic. The spectral parameters i.e. nephelauxetic ratio (beta), covalency factor (b(1/2)), Sinha parameter (delta%) and covalency angular overlap parameter (eta) have been calculated from absorption spectra of Nd(III) and Sm(III) complexes. These parameters suggest the metal-ligand covalent bonding. In the present study, the complexes were found to have coordination number nine.
合成了（3,5,13,15-四甲基 2,6,12,16,21-二十二氮杂环二十烷-1(21),2,5,7,9,11(22),12,15,17,19-癸烷）衍生的镧系元素配合物。这些配合物的通式为[Ln(L)X(2).H(2)O]X，其中 Ln=La(3+)、Ce(3+)、Nd(3+)、Sm(3+)和 Eu(3+)，X=NO(3)(-)和 Cl(-)。配体通过元素分析、IR、质量和（1）H NMR 光谱研究进行了表征。所有配合物均通过元素分析、摩尔电导率测量、磁化率测量、IR、质量、电子光谱技术和热研究进行了表征。配体作为六齿配体，通过亚甲胺基团的四个氮原子和吡啶环的两个氮原子配位。镧系元素配合物为反磁性，而其他 Ln(III)配合物为顺磁性。光谱参数，即离域比(beta)、共价因子(b(1/2))、辛哈参数(delta%)和共价角重叠参数(eta)，是从 Nd(III)和 Sm(III)配合物的吸收光谱中计算出来的。这些参数表明了金属-配体的共价键合。在本研究中，这些配合物的配位数被发现为九。
