NDLI: Magneto-structural studies of two new cobalt(II)-N,N-diisobutylisonicotinamide compounds: $[CoLCl_{2}]_{n}$ and $[Co(L)_{2}(H_{2}O)_{4}][CoLBr_{3}]_{2}·2H

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kapoor, Pratibha Hundal, Maninder Singh Hundal, Geeta Corbella, Montserrat Pannu, Ajay Pal Singh Kapoor, Ramesh Aliaga-alcalde, Núria
Description	Author Affiliation: Pannu AP ( Department of Chemistry, Guru Nanak Dev University, Amritsar, 143005, India.)
Abstract	Two similar synthetic pathways using the ligand N,N-diisobutylisonicotinamide (L) with anhydrous $CoX_{2}$ salts (being X = $Cl^{−},$ $Br^{−})$ led to different species: a one-dimensional system, $[CoLCl_{2}]_{n},$ 1, and an ionic product $[Co(L)_{2}(H_{2}O)_{4}][CoLBr_{3}]_{2}·2H_{2}O,$ 2, respectively. Compound 1 is a polymer in which ligand L coordinates to tetrahedral $Co^{II}$ ions in a bidentate bridging fashion using the pyridine nitrogen and carbonyl oxygen atoms. Compound 2 consists of one octahedral cationic $[Co(L)_{2}(H_{2}O)_{4}]^{2+}$ entity and two tetrahedral anionic $[CoLBr_{3}]^{−}$ units. In this system, the ligand molecules coordinate only through the pyridine nitrogen atoms . The magnetic properties of 1 and 2 were investigated in the temperature range of 2.0 to 300.0 K and correlations between both (due to the existence of similar features) examined. The study of the magnetic properties of 1 was carried out by considering each $Co^{II}$ ion as a perfectly isolated system, hence, J = 0, but taking into account a significant zero-field splitting contribution due to distortions on the tetrahedral environment of the cobalt atoms. The fit of the magnetic susceptibility data together with reduced magnetization vs H/T measurements provided similar parameters (\|D\| = 10.8 $cm^{−1},$ $g_{⊥}$ = 1.92, $g_{‖}$ = 2.92 for the former and \|D\| = 11.04 $cm^{−1}and$ g = 2.05 for the latter, respectively). On the other hand, the magnetic response of compound 2 has been analyzed using a model which considers the presence of two tetrahedral and one octahedral Co(II) ions $(Co_{Td}$ and $Co_{Oh}).$ The study was carried out in two separated blocks, above and below 80 K, where only the most significant effects at each interval of temperature were considered. As a result, the analysis of the magnetic data shows weak antiferromagnetic interactions between the $Co_{Oh}and$ the two $Co_{Td}$ ions (J = −0.41 $cm^{−1})$ in 2. The best fit parameters were $g_{CoTd}$ = 2.89, $g_{CoOh}$ = 3.50, $\|D_{CoTd}\|$ = 10.62 $cm^{−1},$ $\|E_{CoTd}\|$ = 2.95 $cm^{−1},$ Δ = 240.9 $cm^{−1}$ and $J_{L-S}$ = −107.1 $cm^{−1},$ from where λ was calculated with a final value of −144.8 $cm^{−1}$ $(J_{L-S}$ = Aκλ). The approximations performed to obtain these values provide reasonable results in agreement with compound 1 and also to other systems in the literature.
ISSN	14779226
Issue Number	46
Journal	Dalton Trans.
Volume Number	40
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2011-12-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in