1997
DOI: 10.1021/ic971174t
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Polymorphism in Spin Transition Systems. Crystal Structure, Magnetic Properties, and Mössbauer Spectroscopy of Three Polymorphic Modifications of [Fe(DPPA)(NCS)2] [DPPA = (3-Aminopropyl)bis(2-pyridylmethyl)amine]

Abstract: Three polymorphic modifications A-C of [Fe(II)(DPPA)(NCS)(2)], where DPPA = (3-aminopropyl)bis(2-pyridylmethyl)amine is a new tetradentate ligand, have been synthesized, and their structures, magnetic properties, and Mössbauer spectra have been investigated. For polymorph A, variable-temperature magnetic susceptibility measurements as well as Mössbauer spectroscopy have revealed the occurrence of a rather gradual HS if LS transition without hysteresis, centered at about 176 K. The same methods have shown that … Show more

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Cited by 106 publications
(87 citation statements)
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“…We previously attempted such a study with the iron(II) spin-crossover complexes with the two tetradentate ligands DPEA [(2-amino-A C H T U N G T R E N N U N G ethyl)bis(2-pyridylmethyl)amine] [30] and DPPA [(3-aminopropyl)bis(2-pyridylmethyl)amine] [25] through the enlargement of just one chelate ring from five-to six-membered. The two ligands differ by the presence of an additional methylene unit in the amino aliphatic chain of the DPPA ligand.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…We previously attempted such a study with the iron(II) spin-crossover complexes with the two tetradentate ligands DPEA [(2-amino-A C H T U N G T R E N N U N G ethyl)bis(2-pyridylmethyl)amine] [30] and DPPA [(3-aminopropyl)bis(2-pyridylmethyl)amine] [25] through the enlargement of just one chelate ring from five-to six-membered. The two ligands differ by the presence of an additional methylene unit in the amino aliphatic chain of the DPPA ligand.…”
Section: Discussionmentioning
confidence: 99%
“…The conformational freedom of six-membered chelate rings has been found to be responsible for several polymorphic modifications for the same iron(II) spin-crossover complex [25] or to lead to order-disorder structural transitions in the coordination sphere of complex. [26,27] In this context, polydentate ligands capable of generating one or several six-membered chelate rings in coordination with iron(II), conveying a flexible coordination sphere, are of special interest.…”
Section: Introductionmentioning
confidence: 99%
“…[18] (3-Mepz = 3-methylpyrazolyl) and [Fe{(3-aminopropyl)bis(2-pyridylmethyl)amine}A C H T U N G T R E N N U N G (NCS) 2 ] [19] all exhibit quite different behavior in various forms of polymorphs. Recently the SCO Fe complex trans-[FeA C H T U N G T R E N N U N G (abpt) 2 (N(CN) 2 ) 2 ] [20] was also found to have different polymorphs; therefore, detailed structural analysis becomes essential to understand the magnetic behavior.…”
Section: Introductionmentioning
confidence: 99%
“…[1][2][3][4][5] This setback, which manifests itself in phenomena such as polymorphism and solvatomorphism, is particularly relevant in the drug industry; however, it is common in many materials, such as organic semiconductors, 6,7 supramolecular systems 1 and spin crossover (SCO) compounds. 5,[8][9][10][11][12][13][14][15][16][17][18][19][20] Despite some exceptions, in which polymorphism is exploited as an advantageous property, [21][22][23][24] usually it is thought to be a drawback for many technological applications, which often compromises the development of materials. On the contrary, gaining a detailed knowledge of different crystal forms and their influence on the functionalities can be the manner to select the best performing phase.…”
Section: Introductionmentioning
confidence: 99%