@article{0ea401b04ea24df6a1a477f09f8dfa12,
title = "Slow magnetic relaxation and water oxidation activity of dinuclear CoIICoIIIand unique triangular CoIICoIICoIIImixed-valence complexes",
abstract = "Construction of efficient multifunctional materials is one of the greatest challenges of our time. We herein report the magnetic and catalytic characterization of dinuclear [CoIIICoII(HL1)2(EtOH)(H2O)]Cl·2H2O (1) and trinuclear [CoIIICoII2(HL2)2(L2)Cl2]·3H2O (2) mixed valence complexes. Relevant structural features of the complexes have been mentioned to correlate with their magnetic and catalytic properties. Unique structural features, especially in terms of significant distortions around the CoIIcentre(s), prompted us to test both spin-orbit coupling (SOC) and zero field splitting (ZFS) methodologies for the systems. The positive sign ofDvalues has been established from X-band EPR spectra recorded in the 5-40 K temperature range and reaffirmed by CAS/NEVPT2 calculations. ZFS tensors are also extracted for the compounds along with CoIIGaIIIand CoIIZnIICoIIImodel species. Interestingly,1shows slow relaxation of magnetization below 6.5 K in the presence of a 1000 Oe external dc field with two relaxation processes (Ueff= 37.0 K withτ0= 1.57 × 10−8s for the SR process andUeff= 7 K withτ0= 1.66 × 10−6s for the FR process). As mixed valence cobalt complexes with various nuclearities are central to the quest for water oxidation catalysts, we were prompted to explore their features and to our surprise, water oxidation ability has been realized for both1and2with significant nuclearity control.",
author = "Ritwik Modak and Biswajit Mondal and Yeasin Sikdar and Jayisha Banerjee and Enrique Colacio and Itziar Oyarzabal and Joan Cano and Sanchita Goswami",
note = "Funding Information: S. G. is grateful to CAS-V of the Department of Chemistry, University of Calcutta and the Department of Higher Education, Science & Technology and Biotechnology, Government of West Bengal (Memo No.:124(Sanc.)/ST/P/S&T/ 15G-3/2015 dated 28.09.2018) for financial support. R. M. acknowledges UGC, India, for the RFSMS fellowship (Sanction No. UGC/740/RFSMS), DST-FIST. Y. S. acknowledges the CSIR-SRF Fellowship (09/028(0983)2016-EMR-I). DST-Purse is gratefully acknowledged for providing the HRMS facility at the Department of Chemistry, University of Calcutta. J. C. is grateful to the MinisterioEspa{\~n}ol de Ciencia e Innovaci{\'o}n (Projects CTQ2016-75068P and CTQ2016-75671P) and Unidad de Excelencia Mar{\'i}a de Maetzu (MDM-2015-0538) for financial support. E. C. acknowledges financial support from Ministerio de Econom{\'i}a y Competitividad (MINECO) for Project CTQ2014-56312-P, the Ministerio de Educaci{\'o}n, Cultura y Deporte for projects PGC2018-102052-B-C21, the Junta de Andaluc{\'i}a (FQM-195) and the University of Granada. I. Oyarzabal is grateful to the Department of Education, Universities and Research of the Basque Government for a postdoctoral fellowship. The authors acknowledge technical and human support provided by SGIker of UPV/EHU and European funding (ERDF and ESF). Funding Information: S. G. is grateful to CAS-V of the Department of Chemistry, University of Calcutta and the Department of Higher Education, Science & Technology and Biotechnology, Government of West Bengal (Memo No.:124(Sanc.)/ST/P/S&T/15G-3/2015 dated 28.09.2018) for financial support. R. M. acknowledges UGC, India, for the RFSMS fellowship (Sanction No. UGC/740/RFSMS), DST-FIST. Y. S. acknowledges the CSIR-SRF Fellowship (09/028(0983)2016-EMR-I). DST-Purse is gratefully acknowledged for providing the HRMS facility at the Department of Chemistry, University of Calcutta. J. C. is grateful to the MinisterioEspa?ol de Ciencia e Innovaci?n (Projects CTQ2016-75068P and CTQ2016-75671P) and Unidad de Excelencia Mar?a de Maetzu (MDM-2015-0538) for financial support. E. C. acknowledges financial support from Ministerio de Econom?a y Competitividad (MINECO) for Project CTQ2014-56312-P, the Ministerio de Educaci?n, Cultura y Deporte for projects PGC2018-102052-B-C21, the Junta de Andaluc?a (FQM-195) and the University of Granada. I. Oyarzabal is grateful to the Department of Education, Universities and Research of the Basque Government for a postdoctoral fellowship. The authors acknowledge technical and human support provided by SGIker of UPV/EHU and European funding (ERDF and ESF). Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2020.",
year = "2020",
month = may,
day = "21",
doi = "10.1039/d0dt00036a",
language = "English",
volume = "49",
pages = "6328--6340",
journal = "Dalton Transactions",
issn = "1477-9226",
publisher = "Royal Society of Chemistry",
number = "19",
}