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Temperature induced spin crossover behaviour in mononuclear cobalt(II) bis terpyridine complexes

Published online by Cambridge University Press:  08 April 2019

Venkata Nikhil Raj M.,
Kishalay Bhar,
Tanveer A. Khan,
Surbhi Jain,
Franc Perdih,
Partha Mitra and
Anuj K. SharmaOpen the ORCID record for Anuj K. Sharma[Opens in a new window]
Venkata Nikhil Raj M.
Affiliation:
Department of Chemistry, School of Chemical Sciences and Pharmacy, Central University of Rajasthan, NH-8, Bandarsindri-305817, Ajmer, Rajasthan, India
Kishalay Bhar
Affiliation:
Department of Chemistry, School of Chemical Sciences and Pharmacy, Central University of Rajasthan, NH-8, Bandarsindri-305817, Ajmer, Rajasthan, India
Tanveer A. Khan
Affiliation:
Department of Chemistry, School of Chemical Sciences and Pharmacy, Central University of Rajasthan, NH-8, Bandarsindri-305817, Ajmer, Rajasthan, India
Surbhi Jain
Affiliation:
Department of Chemistry, School of Chemical Sciences and Pharmacy, Central University of Rajasthan, NH-8, Bandarsindri-305817, Ajmer, Rajasthan, India
Franc Perdih
Affiliation:
Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, PO Box537, SI-1000 Ljubljana, Slovenia
Partha Mitra
Affiliation:
Department of Central Scientific Service (CSS), Indian Association for the Cultivation of Science, Kolkata700 032, India
Anuj K. Sharma*
Affiliation:
Department of Chemistry, School of Chemical Sciences and Pharmacy, Central University of Rajasthan, NH-8, Bandarsindri-305817, Ajmer, Rajasthan, India
*
*Corresponding author: Dr. Anuj K. Sharma (Email: anuj.sharma@curaj.ac.in)
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Abstract

Dicationic cobalt(II) complexes of the type [Co(fterpy)2]c(X)2·nH2O·mCH3OH (fterpy = 4′-(2-furyl)-2,2′:6′,2″-terpyridine; 1: X = PF6-, n = 1.5, m = 0; 2: X = ClO4-, n = 1, m = 1) have been isolated using self-assembly method and characterized by various spectroscopic techniques. In crystalline states both compounds exhibit gradual and incomplete spin crossover (SCO) behaviour in the temperature range 2-320 K. Various spin states of cobalt(II) in 1 have been confirmed by crystallographic evidences at 150 K and 293 K. A variation in counter anions and solvent molecules from 1 to 2 substantially improves the cooperativity among the spin active metal centres and thereby changing the nature of SCO behaviour.

Keywords

x-ray diffraction (XRD)magnetic propertiesspectroscopysupramolecular

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MRS Advances , Volume 4 , Issue 28-29: Innovations and Technology for Rural India , 2019, pp. 1597 - 1610
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

In Memory of Dr. Sunil G. Naik

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