+ 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

Co3(RL)2(hfac)6 ladder complex of 5-[4-(N-tert-butyl-N-aminoxyl)phenyl]pyrimidine

, : Co3(RL)2(hfac)6 ladder complex of 5-[4-(N-tert-butyl-N-aminoxyl)phenyl]pyrimidine. Inorganic Chemistry 45(6): 2562-2567

5-[4-(N-tert-butyl-N-aminoxyl)phenyl]pyridimine (4NITPhPyrim = RL) forms a 1-D ladder polymer complex with Co(hfac)2 of stoichiometry Co3(RL)2(hfac)6, having antiparallel [Co(II)RL]n linear chains (rails) that are cross-linked by Pyrim-Co(hfac)2-Pyrim rungs. The magnetic behavior above 100 K is consistent with contributions from one high-spin Co(II) ion (the cross-link, S = 3/2) plus two Co-ON units with strongly antiferromagnetic (AFM) metal-radical exchange (each S = 1). The chiT data show an AFM downturn as the temperature drops. Assuming weak exchange along chain portions of the polymer due to poor spin polarization across the phenyl-pyrimidine bond in RL, a linear three-spin (S = 1, 3/2, and 1) fit to the T > 18 K data yields an AFM cross-linker (rung) effective exchange of J(CL)/k = (-)5.3 K = (-)3.7 cm(-)(1). Superexchange (sigma-orbital overlap) is a likely mechanism for the effective AFM exchange between CoON and Co spin sites in the three-spin groupings.


PMID: 16529477

DOI: 10.1021/ic051884w

Other references

di Friedberg, P.S., 1966: Litostratigrafica petrolifera della Sicilia. Rev Miner sicil, 88-901964: 198-217

Metz, Robert., 1995: Ichnologic study of the Lockatong Formation (Late Triassic), Newark Basin, southeastern Pennsylvania. Ichnos. April; 41: 43-51

Herrmann, H-J., 1984: Rasterelektronmikroskopische Untersuchungen an Zahnen der drei mitteleuropaischen Braunfroscharten Rana arvalis, Rana dalmatina und Rana temporaria (Amphibia, Anura, Ranidae). Zoologische Abhandlungen (Dresden). 1983 ; 3910: 137-140

Lohmann, R.; Harner, T.; Thomas, G.O.; Jones, K.C., 2000: A comparative study of the gas-particle partitioning of PCDD/Fs, PCBs, and PAHs. Air samples were taken concurrently for four sampling events in the winter of 1998 at three contrasting sites: an urban center and two rural sites. The rural sites were characterized by the extensive usage of coal and wood for space heating. Sampl...

Johnson, Alan M. ., 1998: ICOP-X. 10th International Congress of Protozoology. The University of Sydney, Australia. Monday 21 July - Friday 25 July 1997. International Journal for Parasitology. January; 281: i-v, 1-217

Nakajo, S.; Nakaya, K.; Nakamura, Y., 1983: Cell surface radiolabeling of the carbohydrate moieties of the plasma membrane major glycoprotein of AH-66 hepatoma ascites cells. Chemical & Pharmaceutical Bulletin 31(6): 2039-2044

Chandra, R.; Ansah, P.; Sagara, I.; Sie, A.; Tiono, A.B.; Djimde, A.A.; Zhao, Q.; Robbins, J.; Penali, L.K.; Ogutu, B., 2016: Comparison of azithromycin plus chloroquine versus artemether-lumefantrine for the treatment of uncomplicated Plasmodium falciparum malaria in children in Africa: a randomized, open-label study. This randomized, open-label study was conducted to establish the non-inferiority of a combination of azithromycin (AZ) and chloroquine (CQ) to artemether-lumefantrine (AL) for treatment of uncomplicated malaria in children from six sites in sub-Sa...

Bae, M-Kyoung.; Ahn, M-Young.; Jeong, J-Won.; Bae, M-Ho.; Lee, Y.Mie.; Bae, S-Kyung.; Park, J-Wan.; Kim, K-Rok.; Kim, K-Won., 2001: Jab1 interacts directly with HIF-1alpha and regulates its stability. Hypoxia-inducible factor-1 (HIF-1) is a master transcription factor that controls transcriptional activation of a number of genes responsive to the low cellular oxygen tension, including vascular endothelial growth factor (VEGF), erythropoietin, a...

Ferracane, J.L.; Mafiana, P.; Cooper, C.; Okabe, T., 1987: Time-dependent dissolution of amalgams into saline solution. The dissolution of mercury, silver, and copper from polished and unpolished surfaces of low- and high-copper amalgams into saline was investigated with respect to time via atomic absorption spectrophotometry. Greater amounts of mercury and silver...

Wu, X.; Greenwood, P.; Fu, S., 2015: Target enhancement and distractor inhibition affect transitory surround suppression in dual tasks using multiple rapid serial visual presentation streams. Few studies have investigated the interaction between temporal and spatial dimensions on selective attention using dual tasks in the multiple rapid serial visual presentation (RSVP) paradigm. A phenomenon that the surround suppression in space cha...