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1,4,8,11-Tetramethyl-1,4,8,11-tetraazacyclotetradecane is used as a macrocyclic chelating agent in coordination chemistry. It is also used as a ligand which bind strongly to a wide range of metal ions and as crown ethers.
Mase, K.; Ohkubo, K.; Xue, Z.; Yamada, H.; Fukuzumi, S. Catalytic two-electron reduction of dioxygen catalysed by metal-free  triphyrin (2.1. 1). Chem. Sci. 2015, 6 (11), 6496-6504.
Kim, J.; Halbherr, M.; Gemel, C.; Fischer, R. A. Oxidation of Ni-ECp Complexes: Stable Open-Shell NiI Cations [Ni(ECp)n(PPh3)4-n]+(n= 2, 4; E= Al, Ga). Inorg. Chem. 2015, 54 (20), 9675-9677.
Hazard Statements: H315-H319-H335
Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: P261-P264b-P271-P280-P302+P352-P304+P340-P305+P351+P338-P312-P332+P313-P362-P501c
Avoid breathing dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Use only outdoors or in a well-ventilated area. Wear protective gloves/protective clothing/eye protection/face protection. IF ON SKIN: Wash with plenty of soap and water. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Call a POISON CENTER or doctor/physician if you feel unwell. If skin irritation occurs: Get medical advice/attention. Take off contaminated clothing and wash before reuse. Dispose of contents/ container to an approved waste disposal plant