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1271-24-5

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1271-24-5 Usage

Chemical Properties

bordeaux crystalline powder

Uses

Provides catalyst for ethylene polymerization. A precursor to other chromium(II) compounds.

General Description

Red needles or reddish-purple solid.

Air & Water Reactions

Chromocene is very sensitive to exposure to air and moisture (decomposition is not vigorous). Decomposes in water .

Reactivity Profile

Chromocene reacts with water and alcohols. . It's reaction with alcohols produces pyrophoric metal alkoxides (dialkoxychromium and cyclopentadiene).

Fire Hazard

Literature sources indicate that Chromocene is flammable.

Purification Methods

Chromocene forms pyrophoric red crystals on sublimation at 50o/0.1mm followed by resublimation at 75-90o/0.1mm. Although it is stable at least to 300o, it is readily oxidised in air, and effervesces slowly in H2O to give cyclopentadiene. All operations should be carried out in a dry box. It decomposes in CCl4 or CS2, and for IR even grinding with nujol, KBr or KI causes some decomposition. [Wilkinson et al. J Inorg Nucl Chem 95 109 1956, Wilkinson J Am Chem Soc 76 209 1954, Beilstein 16 IV 1774.]

Check Digit Verification of cas no

The CAS Registry Mumber 1271-24-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,2,7 and 1 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 1271-24:
(6*1)+(5*2)+(4*7)+(3*1)+(2*2)+(1*4)=55
55 % 10 = 5
So 1271-24-5 is a valid CAS Registry Number.
InChI:InChI=1/2C5H5.Cr/c2*1-2-4-5-3-1;/h2*1-5H;/q-5;-1;

1271-24-5 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
  • Packaging
  • Price
  • Detail
  • Alfa Aesar

  • (43177)  Bis(cyclopentadienyl)chromium, sublimed, 97+%   

  • 1271-24-5

  • 1g

  • 923.0CNY

  • Detail
  • Alfa Aesar

  • (43177)  Bis(cyclopentadienyl)chromium, sublimed, 97+%   

  • 1271-24-5

  • 5g

  • 4615.0CNY

  • Detail
  • Aldrich

  • (381004)  Bis(cyclopentadienyl)chromium(II)  95%

  • 1271-24-5

  • 381004-1G

  • 821.34CNY

  • Detail

1271-24-5SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017

1.Identification

1.1 GHS Product identifier

Product name chromocene

1.2 Other means of identification

Product number -
Other names Chromocene

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:1271-24-5 SDS

1271-24-5Related news

Role of silanol groups in formation of supported Chromocene (cas 1271-24-5) catalysts08/18/2019

Deposition studies have established maximum values for the adsorption of chromocene on dehydroxylated silicas. The process of chemisorption of chromocene changes from reaction of predominantly two to one hydroxyl group as the temperature of silica increases from 100 to 800 °C. Chromocene, depos...detailed

An EXAFS investigation of Chromocene (cas 1271-24-5) on silica using empirical, semi-empirical and ab initio methods08/14/2019

The average chromium environment on the surface of a chromocene/silica ethylene polymerisation catalyst has been determined by Cr-EXAFS to be [(η5-C5H5)Cr(μ-OSi)(OSi)]2.detailed

Crystal and molecular structure of Chromocene (cas 1271-24-5) (η5-C5H5)2Cr08/13/2019

The crystal structure of chromocene has been determined by a low-temperature single-crystal X-ray diffraction study. The average chromium-carbon bond length is 2.151(13) Å.detailed

The adsorption of Chromocene (cas 1271-24-5) and ferrocene on silica: A solid-state NMR study08/10/2019

Ferrocene and chromocene can be adsorbed on silica surfaces by impregnation or by grinding powders of the metallocenes with silica. The vanishing crystal lattice and formation of mobile surface species can in both cases be proven by diminished Chemical Shift Anisotropies and reduced residual lin...detailed

1271-24-5Relevant articles and documents

A facile access to CpCr (acac)Cl and related systems

Heinemann, Oliver,Jolly, Peter W.,Krueger, Carl,Verhovnik, Glenn P.J.

, p. 477 - 479 (1998)

CpCr(acac)Cl has been prepared by reacting CpCr(THF)Cl2 with sodium acetylacetonate. Related Cr compounds containing the C5Me5 group and ethylacetoacetate have also been studied. Catalysts active for the polymerization of ethylene are obtained by treating these compounds with aluminium alkyls while the title compound reacts with Et2AlCl or Et3Al to give [CpCr(μ-Cl)Et]2.

Wilkinson, G.

, p. 209 - 211 (1954)

Ein μ2-Benzylidenkomplex des Chroms mit ungepaarten Elektronen

Koehler, F. H.,Krueger, C.,Zeh, H.

, p. C13 - C15 (2007/10/02)

The benzylidene-bridged dichromium complex 2(μ-Br)2(μ-CHC6H5) (4) has been obtained by thermolysis of 2(μ-Br)2. 1H NMR spectroscopy shows that 4 is antiferromagnetic and a barier of 64.0 kJ mol-1 slows down the rotation of the phenyl group.

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