459409-89-3Relevant academic research and scientific papers
Synthesis and antioxidant evaluation of Schiff bases derived from 2,6-pyridinedicarboxylic acid
Molnar, Maja,Cacic, Milan,Zrinusic, Sanja Zec
, p. 401 - 410 (2012)
A series of novel Schiff bases derived from dipicolinic acid was synthesized and evaluated for antioxidant and iron chelating activity. In most cases Schiff bases derived from di-hydrazide showed higher antioxidant activity than the ones derived from mono-hydrazide and some of them are very promising considering the fact of being better antioxidants than the standards used in the investigation. For iron chelating activity substituents had a greater impact on the activity than mono or di-hydrazide skeleton.
A homoleptic, self-assembled [2 × 2] square Cu4 complex exhibiting intramolecular ferromagnetic exchange
Xu, Zhiqiang,Thompson, Laurence K.,Miller, David O.
, p. 2462 - 2466 (2002)
A carboxylic acid-substituted picolinic hydrazone ligand (pcoap) forms a homoleptic [2 × 2] tetranuclear Cu(II)4 complex with four six-coordinate Cu(II) centers bridged by μ-O alkoxide groups in a square grid structure. The terminal carboxylic groups complete the six-coordinate structures at each copper centre, capping off external coordination positions, with two functioning as carboxylates, and two in neutral carboxylic acid form. Despite very large Cu-O-Cu bridge angles (139.2-140.6°), and short Cu-Cu distances (3.97-4.05 A), which would normally be expected to propagate antiferromagnetic exchange interactions within the grid, strictly orthogonal bridging connections between the metal centers lead to intramolecular ferromagnetic exchange (J = 7.2(3) cm-1), and an S = 4/2 magnetic ground state.
