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<creators>
<creator>
<creatorName>Bouroş, P.N.</creatorName>
<affiliation>Institutul de Fizică Aplicată al AŞM, Moldova, Republica</affiliation>
</creator>
<creator>
<creatorName>Kravţov, V.H.</creatorName>
<affiliation>Institutul de Fizică Aplicată al AŞM, Moldova, Republica</affiliation>
</creator>
<creator>
<creatorName>Dragancea, D.P.</creatorName>
<affiliation>Institutul de Chimie al AŞM, Moldova, Republica</affiliation>
</creator>
</creators>
<titles>
<title xml:lang='en'>Dinuclear manganese(II) complexes with hydrazone ligands</title>
</titles>
<publisher>Instrumentul Bibliometric National</publisher>
<publicationYear>2014</publicationYear>
<relatedIdentifier relatedIdentifierType='ISBN' relationType='IsPartOf'></relatedIdentifier>
<dates>
<date dateType='Issued'>2014</date>
</dates>
<resourceType resourceTypeGeneral='Text'>Conference Paper</resourceType>
<descriptions>
<description xml:lang='en' descriptionType='Abstract'><p>Manganese complexes in general and dinuclear Mn(II) compounds in pa1iicular, with N/O donor ligands have received considerable attention in recent years. This is due to several reasons: unique stmctural features with interesting magnetic prope1iies, manganese containing active sites of enzymes in bioinorganic chemistiy, recognized relevance in homogenous and heterogenous catalysis [ 1]. In the course of our research on polydentate Schiff-base manganese complexes, we repo1i herein two dinuclear Mn(II) complexes with hydrazone Schiff base ligands derived from condensation of o-vanillin with 2-hydroxybenzohydrazide (H3L1 ) or semicarbazide (H2L2). Reaction of Mn(NO3)2&middot;4H2O with the H3L1 ligand, in the presence of sodium azide (1 : 1 : 1 mole ratio), at room temperature in methanol yield the dinuclear manganese(!!) complex [Mn(H2L1 )(CH3OH)(N3)]2 <strong>(1). </strong>Compound [Mn(HL2)(CH3OH)(Cl)h <strong>(2) </strong>was synthesized in similar way using MnCh&middot;4H2O as staiiing salt. Compounds c1ystallize in the ti&middot;iclinic space group P-1, in <strong>1 </strong>: a=9.0686(8), b= l 0.6318(10), c= l 1.067(1) A, a=65.284(9), &beta; =66.371(9), y=72.475(9)0 , <em>V</em><em>= </em>876.5(1) A3, in 2: a=9.0358(6), b=9.5245(6), c=9.7973(8) A, a= l 12.835(7), &beta;=115.911(7), y=93.287(6)0 , V=672.27(8) A3. The X-ray study shown, that in the crystals both dinuclear complexes reside around inversion centers. The monoanionic teti&middot;adentate ligands coordinates to one of the metal <em>via </em>the keto oxygen and the azometine niti&middot;ogen, and via 3-methoxy moiety to another metal. The deprotonated phenolic oxygen atom bridges two metals. Thus, each ligand fo1ms three metallocycles: two five membered and one six-membered. Two ligands fo1m penta-coordinated sunounding in the basal plane of the metals while methanol and the azide anion in <strong>1, </strong>and methanol and chloride anions in <strong>2 </strong>complete the coordination polyhedron of Mn(II) up to pentagonal bipyramid with OsN2 and OsN1Ch. donor sets, respectively. The metal-donor atom distances in 1 ai&middot;e in the ranges Mnl-O 2.172(2) - 2.261(3), Mnl-N are 2.270(4) and 2.290(3) A, and Mnl-O in 2 ai&middot;e in the ranges 2.179(2) - 2.395(2), Mnl-N = 2.325(3) and Mnl-Cl 2.539(1) A. The metal-&middot;&middot;metal separation ai&middot;e 3.417 in 1 and 4.421 A in 2.</p><p>&nbsp;</p></description>
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