78213-68-0Relevant academic research and scientific papers
Synthesis and structure of dilead(II) and dimanganese(II) complexes of macrocycles derived from 3,6-diformylpyridazine
Brooker, Sally,Kelly, Robert J.
, p. 2117 - 2122 (1996)
An improved synthesis of 3,6-diformylpyridazine I has been elaborated. The macrocyclic complexes Pb2L1(ClO4)4 1 and [Pb2L2][ClO4]4 2 were prepared from this precursor, 1,3-diaminopropane and lead(II) perchlorate in 1:1:1 and 2:2:1 ratios respectively. The ability of lead(II) perchlorate to template the formation of the two macrocycle ring sizes, L1 = (2 + 2) and L2 = (4 + 4), simply by alteration of the reagent ratio is unprecedented. Transmetallation of 1 or 2 with manganese(II) perchlorate and an excess of sodium thiocyanate led to the formation of [Mn2L1(NCS)4] 3. Single-crystal X-ray analyses of 2 and 3 revealed that on transmetallation a ring contraction, (4 + 4) to (2 + 2), occurs. The two manganese(II) ions have irregular geometries and are inequivalent; one is six- whilst the other is seven-co-ordinate. Unusual single-atom > NCS bridging of the manganese ions occurs.
Redox rich dicobalt macrocycles as templates for multi-electron transformationsf
Szymczak, Nathaniel K.,Berben, Louise A.,Peters, Jonas C.
supporting information; experimental part, p. 6729 - 6731 (2010/03/25)
Pyridazine-templated dicobalt macrocycles reversibly support five oxidation states with unusually positive CoII/CoI redox couples, and are also active proton reduction electrocatalysts. The Royal Society of Chemistry 2009.
Synthesis of 3,6-Disubstituted Pyridazine Derivatives
Mernari, Bouchaib,Lagrenee, Michel
, p. 2059 - 2061 (2007/10/03)
The synthesis of pyridazine functionalized with dioximes side chains are described. Several 3,6-disubstituted pyridazine derivatives were prepared and their structures determined by spectroscopic methods (nmr, ir and ms).
Dicopper(II) Complexes of Novel Polyfunctional Pyridazines: Crystal Structure and Magnetic Properties of Bis1,N':N2,N">-bis
Abraham, Francis,Lagrenee, Michel,Sueur, Stephane,Mernari, Bouchaib,Bremard, Claude
, p. 1443 - 1447 (2007/10/02)
Two novel pyridazine ligands with 3,6-CR=NOH (R = H, H2L1; Ph, H2L2) oxime side chains were synthesised. the related copper(II) dinuclear complexes 1)2(ClO4)2(H2O)2> 1 and 2)2(ClO4)2(MeOH)n> 2 were obtained subsequently.The crystal structure of 1 was determined: space group P21/n, a=12.031(6), b=9.517(4), c=9.973(5) Angstroem, β=100.16 deg and Z=2.The copper(II) ions of the binuclear unit are bridged by the two diazine fragments of the two essentially planar tetradentate ligands with the oxime nitrogen atoms completing the equatorial co-ordination.Two intra-complex hydrogen bridges link the terminal oximato moieties to give dinucleating macrocyclic complexes.In complexes 1 and 2 the copper(II) is in a classical 4 + 2 environment.The magnetic properties of those compounds revealed a spin-singlet ground state in each case.The singlet-triplet energy gaps were found to be -536(2) for 1 and -545(4) cm-1 for 2.The low-lying states of the complexes are discussed in relation to the nearly planar structure of the macrocyclic complexes.
Poly[di-1,2-(diazinylidene)-ethene-1,2-diols]
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, (2008/06/13)
Poly[di-1,2-(diazinylidene)-ethene-1,2-diols] having the structure: in which the C4 H2 N2 group is a diazinylidene diradical having each C(OH) group adjacent (ortho) to one but not two ring nitrogen atoms and not adjacent (ortho) to each other; X and Y are terminal formyl (CHO) groups or groups derived from them by oxidation; and n has a value of zero to seven--are prepared by a cyanide ion catalyzed condensation of pyrazine-2,5-dicarboxaldehyde, pyridazine-3,6-dicarboxaldehyde; or pyrimidine-4,6-dicarboxaldehyde as the only aldehydes which provide the requisite structures. The polymers form complexes with metal ions including manganese, which is insoluble, and vanadium, which is soluble.
