bis dimethylamino tungsten

bis dimethylamino tungsten

molar mass | 272 g/mol formula | C_4H_12N_2W empirical formula | C_4N_2W_H_12 SMILES identifier | CN(C)[W]N(C)C InChI identifier | InChI=1/2C2H6N.W/c2*1-3-2;/h2*1-2H3;/q2*-1;+2 InChI key | BIRTWROHEBFSNP-UHFFFAOYSA-N

vertex count | 7 edge count | 6 Schultz index | 176 Wiener index | 48 Hosoya index | 15 Balaban index | 2.953

longest chain length | 5 atoms longest straight chain length | 5 atoms longest aliphatic chain length | 0 atoms aromatic atom count | 0 atoms H-bond acceptor count | 2 atoms H-bond donor count | 0 atoms

Find the elemental composition for bis dimethylamino tungsten in terms of the atom and mass percents: atom percent = N_i/N_atoms × 100% mass percent = (N_im_i)/m × 100% Plan: • Write the chemical formula and gather atomic masses from the periodic table. • Determine values for N_i, m_i, N_atoms and m using these items. • Finally, compute the percents and check the results. Write the chemical formula: C_4H_12N_2W Use the chemical formula, C_4H_12N_2W, to count the number of atoms, N_i, for each element and find the total number of atoms, N_atoms: | number of atoms C (carbon) | 4 N (nitrogen) | 2 W (tungsten) | 1 H (hydrogen) | 12 N_atoms = 4 + 2 + 1 + 12 = 19 Divide each N_i by N_atoms to calculate atom fractions. Then use the property that atom fractions must sum to one to check the work: | number of atoms | atom fraction C (carbon) | 4 | 4/19 N (nitrogen) | 2 | 2/19 W (tungsten) | 1 | 1/19 H (hydrogen) | 12 | 12/19 Check: 4/19 + 2/19 + 1/19 + 12/19 = 1 Compute atom percents using the atom fractions: | number of atoms | atom percent C (carbon) | 4 | 4/19 × 100% = 21.1% N (nitrogen) | 2 | 2/19 × 100% = 10.5% W (tungsten) | 1 | 1/19 × 100% = 5.26% H (hydrogen) | 12 | 12/19 × 100% = 63.2% Look up the atomic mass, m_i, in unified atomic mass units, u, for each element in the periodic table: | number of atoms | atom percent | atomic mass/u C (carbon) | 4 | 21.1% | 12.011 N (nitrogen) | 2 | 10.5% | 14.007 W (tungsten) | 1 | 5.26% | 183.84 H (hydrogen) | 12 | 63.2% | 1.008 Multiply N_i by m_i to compute the mass for each element. Then sum those values to compute the molecular mass, m: | number of atoms | atom percent | atomic mass/u | mass/u C (carbon) | 4 | 21.1% | 12.011 | 4 × 12.011 = 48.044 N (nitrogen) | 2 | 10.5% | 14.007 | 2 × 14.007 = 28.014 W (tungsten) | 1 | 5.26% | 183.84 | 1 × 183.84 = 183.84 H (hydrogen) | 12 | 63.2% | 1.008 | 12 × 1.008 = 12.096 m = 48.044 u + 28.014 u + 183.84 u + 12.096 u = 271.994 u Divide the mass for each element by m to calculate mass fractions. Then use the property that mass fractions must sum to one to check the work: | number of atoms | atom percent | mass fraction C (carbon) | 4 | 21.1% | 48.044/271.994 N (nitrogen) | 2 | 10.5% | 28.014/271.994 W (tungsten) | 1 | 5.26% | 183.84/271.994 H (hydrogen) | 12 | 63.2% | 12.096/271.994 Check: 48.044/271.994 + 28.014/271.994 + 183.84/271.994 + 12.096/271.994 = 1 Compute mass percents using the mass fractions: Answer: | | | number of atoms | atom percent | mass percent C (carbon) | 4 | 21.1% | 48.044/271.994 × 100% = 17.66% N (nitrogen) | 2 | 10.5% | 28.014/271.994 × 100% = 10.30% W (tungsten) | 1 | 5.26% | 183.84/271.994 × 100% = 67.59% H (hydrogen) | 12 | 63.2% | 12.096/271.994 × 100% = 4.447%

The first step in finding the oxidation states (or oxidation numbers) in bis dimethylamino tungsten is to draw the structure diagram. Next set every oxidation number equal to the atom's formal charge: In bis dimethylamino tungsten hydrogen is not bonded to a metal with lower electronegativity, so it will have an oxidation state of +1. Any element bonded to hydrogen gains the bonding electrons, decreasing their oxidation state by 1 for every bond: With hydrogen out of the way, look at the remaining bonds. There are 4 carbon-nitrogen bonds, and 2 nitrogen-tungsten bonds. For each of these bonds, assign the bonding electrons to the most electronegative element. First examine the carbon-nitrogen bonds: element | electronegativity (Pauling scale) | C | 2.55 | N | 3.04 | | | Since nitrogen is more electronegative than carbon, the electrons in these bonds will go to nitrogen. Decrease the oxidation number for nitrogen in every highlighted bond (by 1 for single bonds, 2 for double bonds, and 3 for triple bonds), and increase the oxidation number for carbon accordingly: Next look at the nitrogen-tungsten bonds: element | electronegativity (Pauling scale) | N | 3.04 | W | 2.36 | | | Since nitrogen is more electronegative than tungsten, the electrons in these bonds will go to nitrogen: Now summarize the results: Answer: | | oxidation state | element | count -3 | N (nitrogen) | 2 -2 | C (carbon) | 4 +1 | H (hydrogen) | 12 +2 | W (tungsten) | 1

vertex count | 19 edge count | 18 Schultz index | 2300 Wiener index | 636 Hosoya index | 1344 Balaban index | 5.428