Detail of "18972-56-0"

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Intermetallic compounds of Lewis base-bridged transition metal-reducing metal complexes and catalytic use thereof

Intermetallic compounds of Lewis base-bridged transition metal-reducing metal complexes and catalytic use thereof. Speca, Anthony N. (National Distillers and Chemical Corp., USA). U.S. US 4610974 A 9 Sep 1986, 18 pp. Cont.-in-part of U.S. 4,513,095. (United States of America) CODEN: USXXAM. CLASS: ICM: C08F004-64. ICS: C08F004-62; C08F004-68. NCL: 502113000. APPLICATION: US 85-725440 22 Apr 1985. 18972-56-0 and 7791-13-1 are cas registry numbers of chemicals which are used as reagents here. PRIORITY: US 80-209227 24 Nov 1980; US 80-209228 24 Nov 1980; US 80-209229 24 Nov 1980; US 80-209223 24 Nov 1980; US 80-209224 24 Nov 1980; US 80-209225 24 Nov 1980; US 80-209226 24 Nov 1980; US 81-228831 27 Jan 1981; US 83-483054 7 Apr 1983; US 84-578243 8 Feb 1984; US 84-578244 8 Feb 1984. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) The title compds. are prepd. and used as catalyst components in the polymn. of a-olefins. Thus, a catalyst component was prepd. by the reaction of (BuO)4Ti with CrCl3.6H2O and Mg with gas evolution. The component was treated with iso-BuAlCl2 and used with Et3Al to catalyze the polymn. of ethylene, giving 35,160 g polyethylene/g Ti/h. .

Electron paramagnetic resonance of divalent nickel in the low temperature phases of magnesium fluorosilicate and magnesium fluorotitanate

Electron paramagnetic resonance of divalent nickel in the low temperature phases of magnesium fluorosilicate and magnesium fluorotitanate. Rubins, R. S.; Kwee, Kian-Kwet (Dep. Phys., Univ. Texas, Arlington, Tex., USA). J. Chem. Phys., 66(9), 3948-51 (English) 1977. CODEN: JCPSA6. DOCUMENT TYPE: Journal CA Section: 73 (Spectra by Absorption, Emission, Reflection, or Magnetic Resonance, and Other Optical Properties) Section cross-reference(s): 75 The EPR spectra of Ni2+ in single crystals of MgSiF6.6H2O and MgTiF6.H2O were studied at .gtoreq.77 K in the frequency ranges 12-18 and 23-25 GHz. Phase transitions occur on warming the crystals above room temp. at (302 .+-. 1) K in MgSiF6.6H2O and at (318 .+-. 1) K in MgTiF6.6H2O, and on cooling at (301 .+-. 1) K for both crystals. The EPR spectra at 77 K were fitted to the spin Hamiltonian .SCRIPTH. = g.delta.H.cntdot.S + DSz2 + E(Sx2 - Sy2) with g = 2.250 .+-.There are some reagents with their cas registry numbers 18972-56-0 and 14701-22-5 are used in this study. 0.005, |D| = (2.16 .+-. 0.01) cm-1 and E = (0.210 .+-. 0.001) cm-1 for MgSiF6.6H2O and g = 2.245 .+-. 0.005, |D| = (2.3 .+-. 0.1) cm-1 and E = (0.149 .+-. 0.001) cm-1 for MgTiF6.6H2O. In MgSiF6.6H2O, the spectrum in the perpendicular plane showed a 6-fold rotational sym. and consisted of 2 sets of 3 lines related by a rotation of (22 .+-.1).degree. about the c axis. In MgTiF6.6H2O, a single 3-line spectrum with a 6-fold rotational sym. was obsd. in the perpendicular plane. In both crystals, the parameter E increased appreciably with temp. In MgSiF6.6H2O, the temp. gradient .vdelta.E/.vdelta.T was approx. 3.3 .times. 10-4 cm-1/K in the range 77 to 240 K and then decreased with increasing temp. above 240 K. In MgTiF6.cntdot.6H2O, .vdelta.E/.vdelta.T was approx. 4.7 .times. 10-4 cm-1/K in the range 120 and 290 K and then decreased with decreasing temp. below 120 K. .