Synthesis and crystal structure of V(II) binuclear complex with bis(nicotinoylhidrazone)-2,6- diacetylpyridine

Bourosh Pavlina; Mîrzac Alexandra; Danilescu Olga; Shova Sergiu; Bulhak Ion

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2023-07-17 12:05

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BOUROSH, Pavlina, MÎRZAC, Alexandra, DANILESCU, Olga, SHOVA, Sergiu, BULHAK, Ion. Synthesis and crystal structure of V(II) binuclear complex with bis(nicotinoylhidrazone)-2,6- diacetylpyridine. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 168.

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Materials Science and Condensed Matter Physics
Editia 7, 2014

Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Synthesis and crystal structure of V(II) binuclear complex with bis(nicotinoylhidrazone)-2,6- diacetylpyridine

Pag. 168-168

Bourosh Pavlina¹, Mîrzac Alexandra², Danilescu Olga², Shova Sergiu², Bulhak Ion²

¹ Institute of Applied Physics, Academy of Sciences of Moldova,
² Institute of Chemistry of the Academy of Sciences of Moldova

Disponibil în IBN: 6 martie 2019

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Using VOSO4 ·3H2O, 2,6-diacetylpyridine and nicotinic acid hydrazide the previously repo1ied [V(=O)(H2L)(SO4)]"4.75H2O [1] and a new vanadium(!!) binuclear coordination compound [V2(H2L)2](NO3)4-H2O (1) were synthesized and c1ystallized. The X-ray c1ystallography shows that new compound c1ystallizes in the monoclinic space group C2/c, a 17.1607(16), b 28.3964(13), c 14.1062(13) A, p 127.368(15)0, V 5463.1(8) A3, Z 4, D(calc) = 1.422 Mg/m3, C42H3-18O11Vi, R 0.0791. The ionic stmcture of compound is fonned by [V2(H2L)2]4+ complex cations, NO3- anions and solvent molecules H2O in the ratio 1 :4: 1. The crystal structure detennination shows that the binuclear complex cation has a double-helical str11cture in which the two organic ligands H2L are neuti-al and twisted around the V(l)-V(l)* (* - x+ 1, y, -z+3/2) axis (Fig.). This binuclear complex cation displays a unique double helical structure similar to the coITesponding Cu(II) complexes [2]. Each V(II) atom binds to 3 sites of the ligand and the other two sites of the second ligand which gives a coordination number of five and a square pyramidal geometry. The base of coordination polyhedra of each V(II) atom is fonned by a set of N O donor atoms: 0(1), N(3), N(4), and N(5)* and the apex of the square pyramid is occupied by 0(2)*. The distances V(l)-0(1), V(l)-N(3), V(l)-N(4), V(l)-N(5)* and V(l)-O(2)* are 1.983(5), 1.920(6), 2.140(6), 1.982(7), and 2.143(5) A, respectively. The V···V* distances in the related binuclear cation involve the V atoms coordinated to Npy atom of H2L and that distance is 3.261 A. This way, H2L ligand obtained by condensation of 2,6-diacetylpyridine and nicotinic acid hydrazide is pentadentate and coordinate, in a chelate neuti-al mode, through N2O at one V(II) from complex cation, as well through NO atoms to another V(II) with f01mation of three five-membered metallocycles. The NO3- anion fo1mation is likely the outcome of secondaiy oxidationreduction process, with pa1iicipation of nicotinic acid hydrazide and metal ions. The results of X-ray diffraction analysis indicate the intermolecular hydrogen bonds Nl/N(7)-H···O(NO3) [d(N···O) 2.72(2) - 2.93(3) A, L(NHO) 139 - 171 °] between the complex cations and anions in the crystal.

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