Name: Pyrazine-2-carboxylic acid. Recently I read an article about CU-II COMPLEX; MOLECULAR-STRUCTURE; MAGNETIC-PROPERTIES, Authors is Cati, DS; Stoeckli-Evans, H in INT UNION CRYSTALLOGRAPHY in [Cati, Dilovan S.] Debiopharm Int SA, Chemin Messidor 5-7,CP 5911, CH-1002 Lausanne, Switzerland; [Stoeckli-Evans, Helen] Univ Neuchatel, Inst Phys, Rue Emile Argand 11, CH-2000 Neuchatel, Switzerland in 2019, Cited 31. The CAS is 98-97-5. Molecular formula is C5H4N2O2, Through research, I have a further understanding and discovery of Pyrazine-2-carboxylic acid
The title tridentate ligand, C14H10N4O, N-(quinolin-8-yl) pyrazine-2-carboxamide (HL1), crystallizes with three independent molecules (A, B and C) in the asymmetric unit. All three molecules are relatively planar (r.m.s. deviations are 0.068, 0.055 and 0.06 angstrom, respectively), with the NH H atom forming three-centered (bifurcated) intramolecular N-H center dot center dot center dot N hydrogen bonds in each molecule. There is also an intramolecular C-H center dot center dot center dot O contact present in each molecule, involving the benzene ring of the quinoline unit and the amide carboxamide O atom. In the crystal, the three molecules stack in columns with the various molecules being linked by offset pi-pi interactions [intercentroid distances vary from 3.367 (5) to 3.589 (5) angstrom], forming layers parallel to the ab plane. The title complex, [Cu-4(C42H44N8O16)]center dot 2CH(3)OH, {hexa-mu-acetato-1: 2 kappa O-2:O’;2:3 kappa O-8:O’;3:4 kappa O-2:O’-dimethanol-1 kappa O, 2 kappa O-bis[N-(quinolin-8-yl) pyrazine-2-carboxamide]-1 kappa N-3, N’, N ”; 4 kappa(3) N, N’, N ”-tetracopper(II) methanol disolvate} (I), was obtained by the reaction of HL1 with Cu(CH3CO2)(2). It consists of a tetranuclear complex with a central tetrakis(mu-acetato) dicopper paddle-wheel moiety linked on either side via bridging acetato ions to a mononuclear copper(II)-(L1) complex; it crystallizes as a methanol disolvate. The complex possesses inversion symmetry, being located about a center of symmetry situated at the mid-point of the Cu center dot center dot center dot Cu bond of the paddle-wheel moiety. In the crystal, the complex molecules are linked by O-H center dot center dot center dot O hydrogen bonds, forming chains along the [01 (1) over bar] direction, which are linked by offset pi-pi interactions [intercentroid distance = 3.7367 (11) angstrom] and C-H center dot center dot center dot O hydrogen bonds, leading to the formation of a supramolecular framework.
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Reference:
Patent; Chevron Research Company; US4732894; (1988); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem