Universität zu Köln

Bueyekyazi, Mehtap, Hegemann, Corinna, Lehnen, Thomas, Tyrra, Wieland and Mathur, Sanjay (2014). Molecular Co(II) and Co(III) Heteroarylalkenolates as Efficient Precursors for Chemical Vapor Deposition of Co3O4 Nanowires. Inorg. Chem., 53 (20). S. 10928 - 10937. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-510X

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Abstract

Two new cobalt precursors, Co-II(PyCHCOCF3)(2)(DMAP)(2) (1) and Co-III(PyCHCOCF3)(3) (2), based on Co(II) and Co(III) centers were synthesized using a redox active ligand system. The different chemical configurations of 1 and 2 and differential valence states of cobalt were confirmed by crystal structure determination and comprehensive analytical studies. Whereas 1 could not be studied by NMR due to the paramagnetic nature of the central atom, 2 was unambiguously characterized by multinuclear 1D and 2D NMR experiments in solution. Both compounds are efficient precursors for catalyst-free growth of Co3O4 nanowires on Si and Al2O3 substrates by a chemical vapor deposition process. The different valence states of cobalt species influenced their chemical decomposition pathways in the gas phase; for instance, 1 was partially oxidized (Co2+ -> Co3+), and 2 underwent reduction (Co3+ -> Co2+) to form pure cobaltite in both cases that verified the metal-ligand redox interplay. Co3O4 nanowires with nanometric diameters (50-100 nm) were obtained irrespective of the chosen cobalt precursor. Investigations on the humidity sensing behavior of CVD deposits demonstrated their potential as promising sensor materials.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bueyekyazi, Mehtap UNSPECIFIED UNSPECIFIED UNSPECIFIED Hegemann, Corinna UNSPECIFIED UNSPECIFIED UNSPECIFIED Lehnen, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Tyrra, Wieland UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-425659
DOI:	10.1021/ic501157e
Journal or Publication Title:	Inorg. Chem.
Volume:	53
Number:	20
Page Range:	S. 10928 - 10937
Date:	2014
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1520-510X
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GAS-SENSING PROPERTIES; LITHIUM-ION BATTERIES; THIN-FILMS; COBALT OXIDES; ELECTROSPINNING PROCESS; HUMIDITY DETECTION; CRYSTAL-STRUCTURES; MESOPOROUS CO3O4; NANOSTRUCTURES; COMPLEXES Multiple languages Chemistry, Inorganic & Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/42565