Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1110, Issue -, Pages 180-184Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2016.01.051
Keywords
Zinc; Cobalt; Hydrazone; Coordination complex; Hydrogen bonding
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Funding
- PAESMEM program through the National Science Foundation
- New York State's Graduate Research and Teaching Initiative
- Natural Science Foundation of Hubei Province in China [2015CFA130, 2013CFA015]
- CUNY Collaborative Research Incentive Program (CIRG) [80209-06]
- Program for Research Initiatives for Science Majors (PRISM) at John Jay College - Title V, HSI-STEM and MSEIP programs within the U.S. Department of Education
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Two multidentate Schiff base ligands containing a hydrazone unit have been synthesized and investigated for zinc(II) and cobalt(II) coordination chemistry. The reactions of the 4-pyridyl derived hydrazone ligand HL1 with zinc(II) or cobalt(II) salts gave three mononuclear complexes that were structurally characterized by X-ray diffraction analysis. The results revealed that the ligand could adopt different coordination modes when various counter anions were employed. While in the case that zinc dichloride was used as a metal salt a neutral mononuclear mono-ligand complex was formed, the deprotonation of hydrazone occurred when zinc(II) or cobalt(II) nitrate were present and two new isostructural mononuclear bis-ligand complexes were isolated. Modification of the hydrazone ligand with oxygen donors was found to have a significant impact on the ligand reactivity, and a similar reaction of H(2)L2 with cobalt(II) nitrate gave a protonated product of H(2)L2 without the incorporation of cobalt(II), which features a one-dimensional hydrogen-bonded network in the solid state. (C) 2016 Elsevier B.V. All rights reserved.
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