X-ray structure and spectroscopy of novel trans-[Ni(L)(NO3)(2)] and [Ni(L)](ClO4)(2)center dot 2H(2)O complexes

作者：Subhan Md Abdus^*; Choi Jong Ha

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2014, 123: 410-415.

DOI：10.1016/j.saa.2013.12.069

• Crystal structure
• Spectroscopic properties
• Nickel(II)
• Macrocyclic ligand
• trans-III Conformation

Ni(L)(NO3)(2) (complex 1) and [Ni(L)](ClO4)(2)center dot 2H(2)O (complex 2) [L = 3,14-diethyl-2,6,13,17-tetraazatricyclo(16.4.0.0(7.12))docosane] have been prepared and structurally characterized by single-crystal X-ray diffraction at 200 K. For these constrained macrocycle complexes, nickel(II) exists in a distorted octahedral environment with the four nitrogen atoms of the macrocyclic ligands and two oxygen atoms from nitrate in axial positions in complex I. The macrocyclic ligand in complex 1 adopts the most stable trans-Ill conformation. The Ni-N distances in both the complex 1 (2.094(4)-2.051(4) angstrom) and complex 2 (2.042(8)-1.996(7) angstrom), are typical but the axial ligands are coordinating, with Ni-O bond length, 2.198(3) angstrom for complex 1. The complex 2 adopts square planner geometry around the Ni(II) with four nitrogen atoms from macrocyclic ligand. The crystals are stabilized in a 3-D network by intra and intermolecular hydrogen bonds that are formed among the secondary nitrogen hydrogen atoms and nitrate in 1, and intermolecular hydrogen bonds are formed by perchlorate and -N-H groups in 2. The electronic absorption, IR and PL spectral properties are also discussed.

• 出版日期2014-4-5