Mixed-ligand CoII and CdII complexes with 4-aminoantipyrine

• Published in: Journal of coordination chemistry Vol. 61; no. 4; pp. 595 - 604
• Main Authors: Wang, Qian, Wu, Ming-Jie, Yang, En-Cui, Wang, Xiu-Guang, Zhao, Xiao-Jun
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 20-02-2008
• Subjects: 4-Aminoantipyrine; Crystal structures; Metal-organic coordination polymers; Self-assembly
• ISSN: 0095-8972; 1029-0389
• DOI: 10.1080/00958970701366268

Self-assembly of 4-aminoantipyrine (AAP) and 5-nitroisophthalic acid (H
2
NIP) with Co(CH
3
COO)
2
or Cd(NO
3
)
2
in CH
3
OH-H
2
O at room temperature generated {[Co
2
(AAP)(NIP)(H
2
O)
8
][Co(AAP)(NIP)
2
(H
2
O)
2
](H
2
O)
4.5
} (1) and {[Cd(AAP)(NIP)(H
2
O)](H
2
O)}
n
(2), which were further characterized by X-ray diffraction, IR spectra, elemental analysis and solid-state fluorescence spectra. The structure analysis indicates that 1 contains two individual fragments, one NIP-bridged six-coordinate binuclear Co
II
cation and a mononuclear Co
II
dianion. The binuclear units are connected into 1-D chains via O-H ··· O hydrogen bond interactions, which were further assembled into a 2-D supramolecular layer bridged by the mononuclear Co
II
unit. Complex 2 is a linear NIP bridged seven-coordinate Cd
II
polymeric chain with the terminal AAP ligands as decorations, and are further extended into 2-D network by classic hydrogen bonds and π ··· π stacking interactions. Both solid complexes exhibit emission spectra from intraligand electron transfer at room temperature.