Synthesis and solution stability of water-soluble ?(2)N,?O-bis(3,5-dimethylpyrazolyl)ethanol manganese(i) tricarbonyl bromide (CORM-ONN1).

Title Synthesis and solution stability of water-soluble ?(2)N,?O-bis(3,5-dimethylpyrazolyl)ethanol manganese(i) tricarbonyl bromide (CORM-ONN1).
Authors R. Mede; J. Traber; M. Klein; H. Görls; G. Gessner; P. Hoffmann; M. Schmitt; J. Popp; S.H. Heinemann; U. Neugebauer; M. Westerhausen
Journal Dalton Trans
DOI 10.1039/c6dt03551e
Abstract

The reaction of (OC)5MnBr with bis(3,5-dimethyl-1-pyrazolyl)methane yields [{(Pz(Me2))2CH2}Mn(CO)3Br] (1). The use of tridentate heteroscorpionates such as bis(3,5-dimethyl-1-pyrazolyl)acetic acid and 2,2-bis(3,5-dimethyl-1-pyrazolyl)ethanol leads to the formation of mononuclear [(OC)3Mn{(Pz(Me2))2CH-CO2}] (2) and [(OC)3Mn{(Pz(Me2))2CH-CH2OH}]Br (3, CORM-ONN1). Salt-like photoCORM 3 is soluble in aqueous media up to a concentration of 200 ?M, non-toxic up to an approx. 65 ?M solution and releases all carbonyl ligands upon irradiation. The molecular complexes 1 and 2 are insoluble in aqueous solutions. CORM-ONN1 (3) slowly degrades in methanol yielding iCORM 4, consisting of the complex cation [{(Pz(Me2))2CH-CH2OH}{(Pz(Me2))2CH-CH2O}Mn](+) and the [Mn(CO)5](-) counter anion with the cations linked to a dimeric unit by intermolecular hydrogen bridges between the alcohol and alkoxide functionalities.

Citation R. Mede; J. Traber; M. Klein; H. Görls; G. Gessner; P. Hoffmann; M. Schmitt; J. Popp; S.H. Heinemann; U. Neugebauer; M. Westerhausen.Synthesis and solution stability of water-soluble ?(2)N,?O-bis(3,5-dimethylpyrazolyl)ethanol manganese(i) tricarbonyl bromide (CORM-ONN1).. Dalton Trans. 2017. doi:10.1039/c6dt03551e

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See more Manganese products. Manganese (atomic symbol: Mn, atomic number: 25) is a Block D, Group 7, Period 4 element with an atomic weight of 54.938045. Manganese Bohr ModelThe number of electrons in each of Manganese's shells is [2, 8, 13, 2] and its electron configuration is [Ar] 3d5 4s2. The manganese atom has a radius of 127 pm and a Van der Waals radius of 197 pm. Manganese was first discovered by Torbern Olof Bergman in 1770 and first isolated by Johann Gottlieb Gahn in 1774. In its elemental form, manganese has a silvery metallic appearance. Elemental ManganeseIt is a paramagnetic metal that oxidizes easily in addition to being very hard and brittle. Manganese is found as a free element in nature and also in the minerals pyrolusite, braunite, psilomelane, and rhodochrosite. The name Manganese originates from the Latin word mangnes, meaning "magnet."

Bromine

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