01925nas a2200181   4500008004100000022001400041245015300055210006900208260007100277300001400348490000800362520113900370100002101509700003201530700002401562700003001586856012701616       2014                        eng d  a1089-563900aSolid-state NMR investigations of a MgCl2 center dot 4(CH3)(2)CHCH2OH molecular adduct: a peculiar case of reversible equilibrium between two phases0 aSolidstate NMR investigations of a MgCl2 center dot 4CH32CHCH2OH  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcFEB  a1213-12190 v1183 a<p>MgCl2 center dot xROH molecular adducts are extensively employed as a support material for Ziegler-Natta polyolefin catalysis. However, their structural properties are not well understood. Recently, we reported on the preparation of an isobutanol adduct, MgCl2 center dot 4(CH3)(2)CHCH2OH (MgiBuOH) (Dalton Trans. 2012, 41, 11311), which is very sensitive to the preparation conditions, such as the temperature and refluxing time. For the present study, the structural properties of MgiBuOH adducts prepared under different conditions have been investigated thoroughly by solid-state NMR and nonambient XRD. Formation of two phases has been confirmed, and in situ variable temperature solid-state NMR measurements confirm the coexistence of two phases as well as the oscillation from one to another phase. It is expected that such molecular adducts could have a significant role in organic transformation reactions due to an oscillating structural component. An understanding of phase oscillation with the Mg2+ ion as the central metal ion might shed some light toward understanding various biological and structural functions.</p>1 aThushara, K., S.1 aAjithkumar, Thalasseril, G.1 aRajamohanan, P., R.1 aGopinath, Chinnakonda, S.  uhttp://library.ncl.res.in/content/solid-state-nmr-investigations-mgcl2-center-dot-4ch32chch2oh-molecular-adduct-peculiar-001692nas a2200253   4500008004100000022001400041245011000055210006900165260007300234300001200307490000800319520077400327653002801101653001001129653002101139653000801160653001501168653002701183100002101210700003201231700002401263700003001287856012101317       2014                        eng d  a0926-860X00aStructural investigations of porous MgCl2-2-butanol molecular adduct as support for olefin polymerization0 aStructural investigations of porous MgCl22butanol molecular addu  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN  a267-2740 v4693 a<p>A new heterogeneous Ziegler-Natta (Z-N) catalyst support material, MgCl2 center dot 4(CH3CH(OH)CH2CH3) (Mg2BuOH) has been synthesized. 2-Butanol, a linear, secondary alcohol was chosen for the generation of an active MgCl2 support which results in a Z-N catalyst with TiCl4. Significant feature of this work is the formation of rod shaped molecular adduct with highly porous character. Adduct material is characterized by XRD, TG-DTA, Raman spectroscopy, solid-state NMR and SEM. Activity of the Z-N catalyst supported on Mg2BuOH for ethylene polymerization is comparable with that of commercially available heterogeneous Z-N catalyst. However, there is scope to improve the activity by optimizing textural properties. (C) 2013 Elsevier B.V. All rights reserved.</p>10aheterogeneous catalysis10aMgCl210aMolecular adduct10aNMR10aPolyolefin10aZiegler-Natta catalyst1 aThushara, K., S.1 aAjithkumar, Thalasseril, G.1 aRajamohanan, P., R.1 aGopinath, Chinnakonda, S.  uhttp://library.ncl.res.in/content/structural-investigations-porous-mgcl2-2-butanol-molecular-adduct-support-olefin-0