Stasch F-Block Metals

Question 1

What are 4F metals called

Answer 1

lanthanoids

Question 2

What are 5F metals called

Answer 2

actinoids

Question 3

Why don’t f orbitals tend to participate in bonding

Answer 3

small radial extension of f-orbitals, poor interactions with ligand orbitals

Question 4

Normal ground state of lanthanoids

Answer 4

[Xe] 6s2 5d1 4fn (sometimes 6s2 4fn+1)

Question 5

Lanthanoid 3+ cation general orbital fill

Answer 5

[Xe] 4fn

Question 6

term for greater than expected decrease in ion size across the period

Answer 6

lanthanoid contraction

Question 7

what type of M-C bonds common for lanthanoids

Answer 7

more ionic

Question 8

How to form cyclopentadienyl Ln complexes?

Answer 8

salt metathesis and redox transmetallation

Question 9

describe salt metathesis of Ln

Answer 9

Ln-Cl + Cp-Metal —> Cp3Ln (solvent= THF or Et2O of Aryl solvent)

Question 10

describe redox transmetallation of Ln

Answer 10

Ln[metal] + Cp-Thallium —> Cp3Ln+ Tl[metal]

Question 11

How are Cp2LnCl (+ related) complexed

Answer 11

salt metathesis

Question 12

what is made when L2LnCl + RLi

Answer 12

L2LnR

Question 13

Benefit of the reaction of Cp2Ln-CH3 with H2

Answer 13

activation of hydrogen to produce CH4

Question 14

How to prove methane activation via sigma bond metathesis?

Answer 14

use 13C isotopes

Question 15

Ln[II] prefers oxidation or reduction?

Answer 15

oxidation - due to highly negative reduction potentials.

Question 16

what type of bonds for actinoid M-C bonds

Answer 16

more covalent (than lanthanoid)

Question 17

special property of actinoids?

Answer 17

radioactive

Question 18

actinoid f orbitals more or less involved in M-L bonding than lanthanoids? Why?

Answer 18

more - as easier to hybridise 5f, 6d, 7s.

Question 19

what is uranocene

Answer 19

synthesis using COT2- as a ligand to form -U- (with cyclooctatetraenide)