Spin states of the cobalt(II) complex with bis(pyrazol-3-yl)pyridine and pH-sensitive functional groups and its deprotonated derivatives

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

The reaction of 2,6-bis(pyrazol-3-yl)pyridine H2L bearing pH-sensitive imino groups with cobalt perchlorate hexahydrate followed by the addition of 1,8-diazabicyclo[5.4.0]undec-7-ene affords the cobalt(II) complex [Co(H2L)2](ClO4)2 (I) and its doubly deprotonated analog [Co(HL)2]0 (II). The compounds are characterized by NMR spectroscopy, mass spectrometry, and XRD. The influence of the deprotonation of ligand H2L with a chosen base on the spin state of the cobalt(II) ion in a solution is studied by in situ NMR spectroscopy. Complex I is shown to retain its high-spin state in the whole temperature range accessible in deuterated methanol (200–325 K) both before and after the deprotonation of all pH-sensitive imino groups. However, the doubly deprotonated form of complex I (complex II–2MeOH) exists in the crystal (CIF file CCDC no. 2351546) in the low-spin state, which is the first example of the pH-induced stabilization of this state for the cobalt(II) complexes with 2,6-bis(pyrazol-3-yl)pyridines.

Авторлар туралы

E. Safiullina

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences; Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: fluflucat@gmail.com
Ресей, Moscow; Moscow

I. Nikovskii

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Email: fluflucat@gmail.com
Ресей, Moscow

A. Dan’shina

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Email: fluflucat@gmail.com
Ресей, Moscow; Dolgoprudnyi, Moscow oblast

Yu. Nelyubina

Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences

Email: fluflucat@gmail.com
Ресей, Moscow

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