Complexes with Fe-2(III)(mu-O)(mu-OH) core surrounded by hydrogen-bonding interaction

Three new complexes with Fe-2(III) (mu-O)(mu-OH) core surrounded with one, two, and three amino groups, that is, (6amino-2-pyridylmethyl)bis(pyridylmethyl)an-tine (MAPA), bis(6-amino-2-pyridylmethyl)(pyridylmethyl)amine (BAPA), and tris(6-amino-2-pyridylmethyl)amine (TAPA), which act as hydrogen-bon...

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Published inBulletin of the Chemical Society of Japan Vol. 80; no. 7; pp. 1288 - 1295
Main Authors Honda, Yasutaka, Arii, Hidekazu, Okumura, Takeshi, Wada, Akira, Funahashi, Yasuhiro, Ozawa, Tomohiro, Jitsukawa, Koichiro, Masuda, Hideki
Format Journal Article
LanguageEnglish
Published TOKYO Chemical Soc Japan 15.07.2007
Subjects
Chemistry
Chemistry, Multidisciplinary
Physical Sciences
Science & Technology
METHANE MONOOXYGENASE
FE-2(MU-O) DIAMOND CORE
DISTINCT IRON SITES
(MU-OXO)DIIRON(III) COMPLEXES
CRYSTAL-STRUCTURE
COLI RIBONUCLEOTIDE REDUCTASE
SPECTROSCOPIC CHARACTERIZATION
NONHEME DIIRON ENZYMES
DIOXYGEN-ACTIVATING CENTERS
BIS(MU-OXO)DICOPPER(III) COMPLEX
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Summary:Three new complexes with Fe-2(III) (mu-O)(mu-OH) core surrounded with one, two, and three amino groups, that is, (6amino-2-pyridylmethyl)bis(pyridylmethyl)an-tine (MAPA), bis(6-amino-2-pyridylmethyl)(pyridylmethyl)amine (BAPA), and tris(6-amino-2-pyridylmethyl)amine (TAPA), which act as hydrogen-bonding sites, were synthesized and characterized by electronic absorption spectroscopy and X-ray diffraction analysis. Their structural bond parameters, Fe-N(pyridine), Fe-N(amine), and Fe-mu-O(H) bonds, Fe Fe distance, and Fe-O-Fe angle, could be explained in terms of a combination of two conflicting interactions between NH2 and mu-O(H) groups, that is, a steric repulsion and a hydrogen-bonding interactions. The LMCT bands of mu-O to iron(III) may be affected by hydrogen-bonding interactions between NH and mu-O(H) groups, which are discussed in connection with the formation processes of compound Q and compound X in sMMO and RNR-R2, respectively.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.80.1288