scholarly journals Redox cycling of a copper complex with benzaldehyde nitrogen mustard-2-pyridine carboxylic acid hydrazone contributes to its enhanced antitumor activity, but no change in the mechanism of action occurs after chelation

2015 ◽  
Vol 35 (3) ◽  
pp. 1636-1644 ◽  
Author(s):  
YINLI YANG ◽  
CUIPING LI ◽  
YUN FU ◽  
YOUXUN LIU ◽  
YU ZHANG ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Antitumor Activity ◽  
Mechanism Of Action ◽  
Copper Complex ◽  
Nitrogen Mustard ◽  
Redox Cycling ◽  
Pyridine Carboxylic Acid ◽  
Pyridine Carboxylic

A series of tetranuclear [2 × 2] grid complexes derived from an asymmetric ligand: Structural differences based on metal ion affinities

2011 ◽  
Vol 83 (9) ◽  
pp. 1721-1729 ◽  
Author(s):  
Takuya Shiga ◽  
Mao Noguchi ◽  
Takuto Matsumoto ◽  
Hiroki Sato ◽  
Hirotaka Tahira ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Carboxylic Acid ◽  
Metal Ions ◽  
Copper Complex ◽  
Metal Ion ◽  
Copper Ions ◽  
Acid Methyl Ester ◽  
Water Molecules ◽  
Pyridine Carboxylic Acid ◽  
Pyridine Carboxylic

A series of tetranuclear grid-type complexes were prepared by the reaction of the asymmetric multidentate ligand HL (HL = 2-[3-(2-hydroxyphenyl)-1H-pyrazol-5-yl]-6-pyridine carboxylic acid ethylester) with different metal sources. The tetranuclear copper complex, [Cu4(L1)4(NO3)4(H2O)4]·Et2O·2MeOH (1, HL1 = 2-[3-(2-hydroxyphenyl)-1H-pyrazol-5-yl]-6-pyridine carboxylic acid methyl ester) consists of four ligands, four copper ions, four nitrate ions and four water molecules, forming a [2 × 2] grid structure, in which all four copper ions have the same coordination environment. On the other hand, the corresponding nickel and cobalt complexes, [M4(L2)4(H2O)4]·4MeOH·6H2O (M = Ni (2) and Co (3), (H2L2 = 6-[1,3-dioxo-3-(2-phenyl)propionyl]pyridine-2-carboxylic acid)), have a similar grid core structure to the copper complex with four metal ions, four ligand molecules, and four water molecules, however, in these clusters there are two kinds of coordination site for the metal ions. Temperature-dependent magnetic susceptibility measurements for all complexes demonstrated that antiferromagnetic interactions between the metal ions were in operation. The magnetic susceptibility data of the copper and nickel complexes were analyzed using a tetranuclear model based on H = –2J(S1S2+S2S3+S3S4+S4S1) to give best-fit parameters of g = 2.11(1), J = –1.39(3) cm–1 and g = 2.19(1), J = –0.44(2) cm–1, respectively.

scholarly journals Thermodynamic Properties of Three Pyridine Carboxylic Acid Methyl Ester Isomers

2007 ◽  
Vol 52 (2) ◽  
pp. 580-585 ◽  
Author(s):  
Maria D. M. C. Ribeiro da Silva ◽  
Vera L. S. Freitas ◽  
Luís M. N. B. F. Santos ◽  
Michal Fulem ◽  
M. J. Sottomayor ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Methyl Ester ◽  
Thermodynamic Properties ◽  
Acid Methyl Ester ◽  
Pyridine Carboxylic Acid ◽  
Acid Methyl ◽  
Pyridine Carboxylic

Studies in the pyridine carboxylic acid series

1969 ◽  
Vol 3 (9) ◽  
pp. 537-539 ◽  
Author(s):  
V. I. Trubnikov ◽  
V. V. Petrov ◽  
E. S. Zhdanovich ◽  
N. A. Preobrazhenskii
Keyword(s):  
Carboxylic Acid ◽  
Pyridine Carboxylic Acid ◽  
Pyridine Carboxylic

Thermal analysis studies on pyridine carboxylic acid complexes of zinc(II)

1989 ◽  
Vol 153 ◽  
pp. 249-256 ◽  
Author(s):  
J.R. Allan ◽  
W.C. Geddes ◽  
C.S. Hindle ◽  
A.E. Orr
Keyword(s):  
Thermal Analysis ◽  
Carboxylic Acid ◽  
Pyridine Carboxylic Acid ◽  
Pyridine Carboxylic
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