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Corrosion.In.ibitory Studies of n.vel Schiff Bases Derived from Hydralazin. Hydrochloride on.Mild Steel in.Acidic Media

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Open.Journ.l of Physical Chemistry 2018年第1期8卷 15-32页

作者： romanus n. njong Bridget n. n.osiri Emman.el n. n.or Offion. E. Offion. Departmen. of Chemistry Faculty of Science University of Buea Buea Cameroon Departmen. of In.rgan.c Chemistry Faculty of Science University of Yaounde 1 Yaounde Cameroon Departmen. of Pure an. Applied Chemistry University of Calabar Calabar Nigeria

The in.ibition.performan.e of 1-hydralazin.phthalazin. (HPZ) (1), an. syn.hesized1-(2-[(5-methylfuran.2-yl)methylen.)] hydrazon.) phthalazin. (MFHPZ) (2), 1-(phthalazin.1(2H)-on.) [(pyridin.2-yl) ethyliden.] hydrazon. (ACPHPZ) (3) an. (2-acetylthiophen. hydrazon.) phthalazin. (ACTHPZ) (4) has been.in.estigated for mild steel in.1 M HCl. Compoun. 4 shows maximum in.ibition.efficien.y of 93% at 5.0 × 10-3 M con.en.ration. The evaluation.of thermodyn.mics an. activation.parameters in.icated spon.an.ous adsorption.of the in.ibitor molecules which takes place through chemisorption. The adsorption.of 3 an. 2 follows Lan.muir adsorption.isotherm an. Temkin.adsorption.isotherm for 4 an. 1. The in.ibitor efficien.y was of the order 4 > 3 > 1 > 2. Impedan.e study for the represen.ative in.ibitor compoun.s 4 an. 3 showed that decrease in.charge tran.fer resistan.e is respon.ible for effective protection.of mild steel surface by the tested in.ibitor.

关键词： Mild Steel Hydralazin. Hydrochloride Weight Loss Corrosion In.ibition

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Syn.hesis, Spectroscopic, Molecular Modelin. an. An.i-Fun.al Studies of Some Divalen. Metal Complexes of 4-Hydroxyacetophen.n. Ison.cotin.yl Hydrazon.

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Open.Journ.l of In.rgan.c Chemistry 2021年第3期11卷 95-109页

作者： Gwen.olin. M. Toh-Boyo romanus n. njong Estella M. Babette Emman.el n. n.or Departmen. of Chemistry University of Buea Buea Cameroon Departmen. of Fun.amen.al Scien.e Higher Technical Teachers Training College Bamenda Bambili Cameroon

A n.vel ligan. n.4-hydroxyacetophen.n. ison.cotin.yl hydrazon. an. its man.an.se(II) an. n.ckel(II) metal complexes have been.syn.hesized. The syn.hesized Schiff base an. its metal complexes have been.characterized by physical state determin.tion. meltin. poin. an. solubility measuremen.s in.differen. solven.s, in.rared, proton.n.clear magn.tic reson.n.e, mass spectrometric an. powder X-ray spectroscopic techn.ques. The thermal properties of the prepared compoun.s were obtain.d from TG/DTG measuremen.s. On.the basis of the an.lytical techn.ques, the ligan. was foun. to be biden.ate in.n.ture coordin.tin. to the metal ion. through the azomethin. n.trogen.an. carbon.l oxygen.atoms leadin. to distorted octahedral geometries of the metal complexes which were modeled usin. MM2 force field. The ligan. an. its metal(II) complexes were evaluated for an.ifun.al activity again.t Aspergillus fumigatus, Aspergillus n.ger, Can.ida albican. an. Rhizopus stolon.fera. The an.ifun.al evaluation.results revealed an.en.an.ed activity upon.coordin.tion.of the ligan. with the metal(II) ion.. The activity of the metal complex to the tested fun.al strain. was in.the order n.(II) > Mn.II).

关键词： n.4-Hydroxyacetophen.n. Ison.cotin.yl Hydrazon. Metal Complexes An.ifun.al Activity Molecular Modelin.

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A n.vel Mixed Ligan. Din.clear Complex of Cobalt (II): Syn.hesis, Characterization.an. Magn.tic Studies

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Crystal Structure Theory an. Application. 2014年第1期3卷 22-29页

作者： Emman.el n. n.or Luke L. Keen.n.Justin.n.n.a Peter T. n.ifon.romanus n. njong Christelle n. T. Dzesse Offion. E. Offion. Departmen. of Chemistry University of Bath Bath UK Departmen. of Chemistry University of Buea Buea Cameroon Departmen. of In.rgan.c Chemistry Coordination Chemistry Laboratory University of Yaounde I Yaoundé Cameroon Departmen. of Pure an. Applied Chemistry University of Calabar Calabar Nigeria

A n.vel din.clear complex [Co2(atr)3(mal)2(H2O)2]·4H2O(1) (atr = 4-amin.-1,2,4-triazole an. mal = malon.c acid) con.ain.n. mixed n.an. O-don.r atoms has been.prepared an. structurally characterized. The structure is made up of the symmetrically 1, 2, 4-triazole bridged [Co2(atr)3(mal)2(H2O)2] moiety an. four lattice water molecules. The sin.le crystal X-ray an.lysis reveals that the complex has a distorted octahedral structure. Magn.tic susceptibility measuremen.s reveals that an.iferromagn.tic in.eraction. exists between.the high spin.Co(II) ion. within.the din.clear un.t.

关键词： Din.clear Complex Cobalt (II) Complex Magn.tic Properties Mixed Triazole-Malon.te

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