+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Synthesis, characterization, and structures of divalent europium and ytterbium N,N-dimethylaminodiboranates

, : Synthesis, characterization, and structures of divalent europium and ytterbium N,N-dimethylaminodiboranates. Inorganic Chemistry 49(10): 4578-4585

Treatment of the trichlorides EuCl(3) and YbCl(3) with Na(H(3)BNMe(2)BH(3)) in tetrahydrofuran (THF) results in a reduction to the corresponding divalent europium and ytterbium N,N-dimethylaminodiboranate (DMADB) complexes Eu(H(3)BNMe(2)BH(3))(2)(THF)(2) (1) and Yb(H(3)BNMe(2)BH(3))(2)(THF)(2) (2), which can be separated from trivalent Ln(H(3)BNMe(2)BH(3))(3)(THF) byproducts by extraction and crystallization from pentane. No other lanthanide trihalides react with Na(H(3)BNMe(2)BH(3)) to afford divalent products. Compounds 1 and 2 can also be prepared from the divalent lanthanide iodides EuI(2) and YbI(2) in higher yield and without the need to separate them from trivalent species. Treatment of 1 and 2 with an excess of 1,2-dimethoxyethane (DME) in pentane affords the new species Eu(H(3)BNMe(2)BH(3))(2)(DME)(2) (3) and Yb(H(3)BNMe(2)BH(3))(2)(DME) (4). Compound 1 is dinuclear: each metal center is bound to two chelating DMADB ligands, one of which also bridges to the other metal. Overall, the coordination geometry about each Eu atom can be described as a distorted pentagonal bipyramid, with five B atoms from the DMADB ligands occupying the equatorial sites and two THF molecules occupying the axial sites. Unlike 1, compound 2 is monomeric owing to the smaller radius of Yb(II) versus Eu(II); the B and O atoms describe a distorted cis octahedron. The Eu(DME) complex 3 is also monomeric; both DMADB ligands and both DME molecules chelate to the metal center. The four B atoms and the four O atoms describe a distorted square antiprism, with the O atoms occupying one square face and the B atoms occupying the other. In addition to X-ray crystallographic studies, IR, NMR, and mass spectrometric data are reported for all four new compounds.


PMID: 20392118

DOI: 10.1021/ic100292u

Other references

Robe, P.A.; Nguyen-Khac, M-Tuan.; Lambert, F.; Lechanteur, C.; Jolois, O.; Ernst-Gengoux, P.; Rogister, B.; Bours, V., 2006: Sulfasalazine unveils a contact-independent HSV-TK/ganciclovir gene therapy bystander effect in malignant gliomas. The efficacy of HSV-TK/ganciclovir-based gene therapy on malignant gliomas largely relies on the amplitude of the bystander effect. In these experiments, the anti-inflammatory drug Sulfasalazine increased the HSV-TK/ganciclovir bystander effect in...

Svare, B.; Boechler, M., 1994: Protection and abuse of young in mice: influence of mother-young interactions. Ettore Majorana International Life Sciences Series, 13: 465-477

Mahadevan, M.S., 2010: Genetics. Exposing a DUX tale. Science 329(5999): 1607-1608

Nakashita, S.; Onozawa, Y.; Hayashi, H.; Kawamitsu, H.; Amakawa, T., 2004: Fusobacterium necroforum sepsis. Nihon Naika Gakkai Zasshi. Journal of the Japanese Society of Internal Medicine 92(12): 2415-2416

Vedamurthy, M., 2015: How I Manage Complications in Aesthetic Surgery. Journal of Cutaneous and Aesthetic Surgery 8(2): 106-107

Veress, A.T.; Pearce, J.W.; Solomon, S., 1974: The effect of acute adrenalectomy on volume natriuresis in the rat. Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine 145(2): 533-536

Maris, W.; Rinzema, A., 1977: Farm branches and environmental damage. A more detailed development of the clause "ecological suitability of human activity" as in the Netherlands government report 'Selective Growth' is presented. Various empirical investigations are brought together.

Miertusová, S.; Simaljaková, M., 2003: Yeasts and fungi isolated at the mycology laboratory of the First Dermatovenerology Clinic of the Medical Faculty Hospital of Comenius University in Bratislava 1995-2000. In 1995-2000 we examined in the mycological laboratory 8663 specimens for fungal infection by microscopical examination cultivation. The species was identified by the germ-tube test, fermentation and assimilation of carbohydrates. We examined 3421...

Venkateswara Rao, R.; Basu, K.P., 1951: Thiamine, riboflavin and nicotinic acid content of milk of Indian cows, buffaloes, goats and sheep. The B-vitamin contents of the colostrum and milk of Indian livestock was determined. Variations with season and stage of lactation are presented graphically for individual cows and buffaloes. The average aneurin, riboflavin and nicotinic acid cont...

Jackson, C.J.; Xue, M.; Thompson, P.; Davey, R.A.; Whitmont, K.; Smith, S.; Buisson-Legendre, N.; Sztynda, T.; Furphy, L.J.; Cooper, A.; Sambrook, P.; March, L., 2005: Activated protein C prevents inflammation yet stimulates angiogenesis to promote cutaneous wound healing. Activated protein C (APC) is a serine protease that plays a central role in physiological anticoagulation, and has more recently been shown to be a potent anti-inflammatory mediator. Using cultured human cells, we show here that APC up-regulates t...