NDLI: Triazolopyridines as ligands: structural diversity in iron(ii), cobalt(ii), nickel(ii) and copper(ii) complexes of 3-(2-pyridyl)-[1,2,4]triazolo[4,3-a]pyridine (L10) and spin crossover in [FeII(L10)2(NCS)2]

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Triazolopyridines as ligands: structural diversity in iron(ii), cobalt(ii), nickel(ii) and copper(ii) complexes of 3-(2-pyridyl)-[1,2,4]triazolo[4,3-a]pyridine (L¹⁰) and spin crossover in [Fe^II(L¹⁰)₂(NCS)₂]

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Triazolopyridines as ligands: structural diversity in iron(ii), cobalt(ii), nickel(ii) and copper(ii) complexes of 3-(2-pyridyl)-[1,2,4]triazolo[4,3-a]pyridine (L¹⁰) and spin crossover in [Fe^II(L¹⁰)₂(NCS)₂]

Content Provider	Royal Society of Chemistry (RSC)
Author	Kaase, Dominic Klingele, Marco H. Lach, Jochen Hilgert, Jakob Steinfeld, Gunther Klingele, Julia
Copyright Year	2010
Abstract	The coordination chemistry of the ligand 3-(2-pyridyl)-[1,2,4]triazolo[4,3-a]pyridine (L10) has been investigated and iron(II), cobalt(II), nickel(II) and copper(II) complexes featuring diverse structural motifs have been prepared. In the 2 : 1-type complexes [CoII(L10)2(MeOH)2](ClO4)2 (20), [NiII(L10)2(MeOH)2](ClO4)2 (21), [CuII(L10)2(MeOH)2](ClO4)2 (22), [CoII(L10)2(H2O)2](ClO4)2 (23) and [CuII(L10)2(ClO4)2] (24) the metal centres are N4O2 octahedrally coordinated with two N2,Npyr bidentate ligands L10 in the equatorial positions. In the N6 octahedral 4 : 1-type complex [CoII(L10)4](ClO4)2·H2O (25) both axially coordinating N1 unidentate and equatorially bound N2,Npyr bidentate ligands L10 are observed. The N6 octahedral 3 : 1-type complex [FeII(L10)3](OTf)2·1.5MeCN·0.13H2O·0.87MeOtBu (27) features three N2,Npyr bidentate ligands L10 in the mer configuration. The two closely related N6 octahedral complexes [FeII(L10)2(NCS)2] (29) and [FeII(L10)2(dca)2] (30) have fundamentally different structures. While complex 29 features two equatorially bound N2,Npyr bidentate ligands L10 and axial NCS− co-ligands, complex 30 is a one-dimensional doubly μ1,5-dicyanamido-bridged polymer with N1 unidentate ligands L10 in the axial positions. Temperature-dependent magnetic susceptibility measurements of the iron(II) complexes 28 and 29 have shown the 3 : 1-type complex [FeII(L10)3](ClO4)2·H2O (28) to be in the low-spin state over the range 300–2 K and the 2 : 1-type complex 29 to be a spin crossover compound with T1/2 = 269 K whereas the dicyanamido-bridged complex 30 remains in the high-spin state even down to 113 K, according to X-ray diffraction data. A single end-to-end bridging NCS− co-ligand is found in the N4S square-pyramidal complex [CuII(L10)(NCS)2] (31) which shows Curie–Weiss behaviour over the range 300–2 K. A brief review of the coordination chemistry of triazolopyridines is given.
Starting Page	4495
Ending Page	4507
Page Count	13
File Format	HTM / HTML PDF
ISSN	14779226
Volume Number	39
Issue Number	19
Journal	Dalton Transactions
DOI	10.1039/b925107c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	NCS Curie Weiss Coordination complex Ligand Pyridine Barcelona Metro line 10 Cobalt Nickel Copper Water of crystallization Denticity Humid continental climate Polymer Magnetic susceptibility Spin crossover X-ray crystallography Curie\u2013Weiss law
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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Triazolopyridines as ligands: structural diversity in iron(ii), cobalt(ii), nickel(ii) and copper(ii) complexes of 3-(2-pyridyl)-[1,2,4]triazolo[4,3-a]pyridine (L¹⁰) and spin crossover in [Fe^II(L¹⁰)₂(NCS)₂]

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