부산대학교 도서관

A one-dimensional coordination polymer of CdII based on pyrazine (pz) and 3-nitrophthalic acid (3-nphaH2), namely poly[[diaqua bis(3-nitro-2-carboxylato-1-carboxylic acid)(µ2-pyrazine) cadmium(II)]dihydrate], {[Cd(3-nphaH)2(pz)(H2O)2]. 2H2O}n, was prepared and characterized. The asymmetric unit consists of one CdII center, two (3-nphaH)- anions, two halves of two crystallographically distinct pz ligands, two coordinated and two uncoordinated water molecules. The CdII cation is surrounded by four oxygen atoms from two (3-nphaH)- and two water molecules as well as two nitrogen atoms from two pz ligands in distorted octahedral geometry. Complicated hydrogen bonding network accompanied with N-O···π and C-O···π stacking interactions leads to formation of a 3D supramolecular network. Commonly, this kind of C-O-π and N-O···π interaction is detected in electron-rich CO/NO groups of (3-nphaH)- ligand and electron-deficient π-system of pyrazine. [ABSTRACT FROM AUTHOR]