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Article: Syntheses, characterisation and solid state thermal studies of 1-(2-aminoethyl)piperidine (L), 1-(2-aminoethyl)pyrrolidine (L′) and 4-(2-aminoethyl)morpholine (L″) complexes of nickel(II): X-ray single crystal structure analyses of trans-[NiL2(CH3CN)2](ClO4)2, trans-[NiL2(NCS)2] and trans-[NiL″2(NCS)2]

TitleSyntheses, characterisation and solid state thermal studies of 1-(2-aminoethyl)piperidine (L), 1-(2-aminoethyl)pyrrolidine (L′) and 4-(2-aminoethyl)morpholine (L″) complexes of nickel(II): X-ray single crystal structure analyses of trans-[NiL2(CH3CN)2](ClO4)2, trans-[NiL2(NCS)2] and trans-[NiL″2(NCS)2]
Authors
KeywordsDiamines
Nickel(II) complexes
Crystal structures
Isomerisation
Issue Date2001
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/poly
Citation
Polyhedron, 2001, v. 20 n. 15-16, p. 2073-2082 How to Cite?
AbstractReactions of nickel(II) salts with substituted ethane-1,2-diamine where one of the amine nitrogens is a part of a flexible cyclic ring, e.g. 1-(2-aminoethyl)piperidine (L), 1-(2-aminoethyl)pyrrolidine (L′) and 4-(2-aminoethyl)morpholine (L″) produce a number of complexes of the type: (i) Ni(A-A)2X2 (where X=CF3CO2 −, SCN− and NO2 −; A-A represents L/L′/L″); (ii) Ni(A-A)2(CH3CN)2X2 (X=ClO4 − and NO3 −); (iii) Ni(A-A)2(H2O)2X2 (X=CF3SO3 −, Cl−, Br− and I−); and (iv) Ni(A-A)2(H2O)4X2 (X=0.5SO4 2−, 0.5SeO4 2− and CF3SO3 −). The complexes possess octahedral geometry. The major complexes upon desolvation retain trans-geometry, some of which are cis with respect to the counter-anion and a few of them are square planar. X-ray single crystal structure analyses of trans-[NiL2(CH3CN)2](ClO4)2, trans-[NiL2(NCS)2] (violet) and trans-[NiL″2(NCS)2] (sky-blue) have been done. The violet and sky-blue thiocyanato species have blue and green coloured isomers, respectively, and these pairs of isomers are proposed to be conformational isomers. Solid state thermal investigation of the complexes has been carried out. The complexes show thermochromism due to deaquation–anation/deaquation reaction/change of conformation. Only [NiL2](ClO4)2, [NiL′2(CF3CO2)2] and [NiL″2(NO2)2] undergo thermally induced phase transition. The effect of flexible ring size on diamine has been discussed.
Persistent Identifierhttp://hdl.handle.net/10722/69781
ISSN
2015 Impact Factor: 2.108
2015 SCImago Journal Rankings: 0.592
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLaskar, IRen_HK
dc.contributor.authorMaji, TKen_HK
dc.contributor.authorDas, Den_HK
dc.contributor.authorLu, THen_HK
dc.contributor.authorWong, WTen_HK
dc.contributor.authorOkamoto, KIen_HK
dc.contributor.authorChaudhuri, NRen_HK
dc.date.accessioned2010-09-06T06:16:47Z-
dc.date.available2010-09-06T06:16:47Z-
dc.date.issued2001en_HK
dc.identifier.citationPolyhedron, 2001, v. 20 n. 15-16, p. 2073-2082en_HK
dc.identifier.issn0277-5387en_HK
dc.identifier.urihttp://hdl.handle.net/10722/69781-
dc.description.abstractReactions of nickel(II) salts with substituted ethane-1,2-diamine where one of the amine nitrogens is a part of a flexible cyclic ring, e.g. 1-(2-aminoethyl)piperidine (L), 1-(2-aminoethyl)pyrrolidine (L′) and 4-(2-aminoethyl)morpholine (L″) produce a number of complexes of the type: (i) Ni(A-A)2X2 (where X=CF3CO2 −, SCN− and NO2 −; A-A represents L/L′/L″); (ii) Ni(A-A)2(CH3CN)2X2 (X=ClO4 − and NO3 −); (iii) Ni(A-A)2(H2O)2X2 (X=CF3SO3 −, Cl−, Br− and I−); and (iv) Ni(A-A)2(H2O)4X2 (X=0.5SO4 2−, 0.5SeO4 2− and CF3SO3 −). The complexes possess octahedral geometry. The major complexes upon desolvation retain trans-geometry, some of which are cis with respect to the counter-anion and a few of them are square planar. X-ray single crystal structure analyses of trans-[NiL2(CH3CN)2](ClO4)2, trans-[NiL2(NCS)2] (violet) and trans-[NiL″2(NCS)2] (sky-blue) have been done. The violet and sky-blue thiocyanato species have blue and green coloured isomers, respectively, and these pairs of isomers are proposed to be conformational isomers. Solid state thermal investigation of the complexes has been carried out. The complexes show thermochromism due to deaquation–anation/deaquation reaction/change of conformation. Only [NiL2](ClO4)2, [NiL′2(CF3CO2)2] and [NiL″2(NO2)2] undergo thermally induced phase transition. The effect of flexible ring size on diamine has been discussed.-
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/polyen_HK
dc.relation.ispartofPolyhedronen_HK
dc.rightsPolyhedron. Copyright © Elsevier BV.en_HK
dc.subjectDiamines-
dc.subjectNickel(II) complexes-
dc.subjectCrystal structures-
dc.subjectIsomerisation-
dc.titleSyntheses, characterisation and solid state thermal studies of 1-(2-aminoethyl)piperidine (L), 1-(2-aminoethyl)pyrrolidine (L′) and 4-(2-aminoethyl)morpholine (L″) complexes of nickel(II): X-ray single crystal structure analyses of trans-[NiL2(CH3CN)2](ClO4)2, trans-[NiL2(NCS)2] and trans-[NiL″2(NCS)2]en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0277-5387&volume=20&spage=2073&epage=2082&date=2001&atitle=Syntheses,+characterisation+and+solid+state+thermal+studies+of+1-(2-aminoethyl)piperidine+(L),+1-(2-aminoethyl)pyrrolidine+(L%27)+and+4-(2-aminoethyl)morpholine+(L%27)+complexes+of+nickel(II):++X-ray+single+crystal+structure+analyses+of+trans-[NiL2(CHen_HK
dc.identifier.emailWong, WT: wtwong@hku.hken_HK
dc.identifier.authorityWong, WT=rp00811en_HK
dc.identifier.doi10.1016/S0277-5387(01)00803-8-
dc.identifier.hkuros62650en_HK
dc.identifier.issue15-16-
dc.identifier.isiWOS:000169986500040-

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