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Chapter 4 Multiple Choice Questions
Coordination chemistry
Quiz Content
*
not completed
.
Ln
3+
form the aqua ions [Ln(H
2
O)
n
]
3+
in aqueous solution. Select the
incorrect
statement about [Ln(H
2
O)
n
]
3+
from the list below.
H
2
O exchange for [Lu(H
2
O)
n
]
3+
is faster than that for [Gd(H
2
O)
n
]
3+
.
correct
incorrect
[Dy(H
2
O)
n
]
3+
is more Brønsted acidic than [Sm(H
2
O)
n
]
3+
.
correct
incorrect
[Eu(H
2
O)
9
]
3+
is in equilibrium with [Eu(H
2
O)
8
]
3+
.
correct
incorrect
H
2
O exchange for [Eu(H
2
O)
n
]
2+
is faster than that for [Eu(H
2
O)
n
]
3+
.
correct
incorrect
*
not completed
.
The rate constant for formation of [Ln(C
2
O
4
)(H
2
O)
n
]
+
in aqueous solution decreases from La to Tm because
C
2
O
4
2-
is able to chelate to Tm
3+
but not to La
3+
.
correct
incorrect
Tm
3+
is more oxophilic than La
3+
.
correct
incorrect
the formation constant for [Ln(C
2
O
4
)(H
2
O)
n
]
+
increases from La to Tm.
correct
incorrect
the Ln-OH
2
bond strength in [Ln(H
2
O)
n
]
3+
increases from La to Tm.
correct
incorrect
*
not completed
.
Oxidation states +3, +4, +5 and +6 are all accessible for U in aqueous solution, and complexation with EDTA
4-
can occur. What is the order of
increasing
formation constants for the complexes?
U
3+
< U
4+
< [UO
2
]
+
< [UO
2
]
2+
correct
incorrect
[UO
2
]
+
< U
3+
< [UO
2
]
2+
< U
4+
correct
incorrect
U
4+
< [UO
2
]
2+
< U
3+
< [UO
2
]
+
correct
incorrect
[UO
2
]
+
< [UO
2
]
2+
< U
3+
< U
4+
correct
incorrect
*
not completed
.
Select the
incorrect
statement about f-element tris-silylamides from the list below.
[Ln{N(SiMe
3
)
2
}
3
] have trigonal pyramidal coordination geometry in the solid state.
correct
incorrect
[La{N(SiMe
3
)
2
}
3
] and [U{N(SiMe
3
)
2
}
3
] react in the same way with Me
3
NO.
correct
incorrect
[Ln{N(SiMe
3
)
2
}
3
] react with an excess of HSeSi(SiMe
3
)
3
to form [Ln{SeSi(SiMe
3
)
3
}
3
].
correct
incorrect
[U{N(SiMe
3
)
2
}
3
] reacts with CN
-
to form [U{N(SiMe
3
)
2
}
3
(CN)]
-
, in which CN
-
is bonded through C to U.
correct
incorrect
*
not completed
.
Consider the following statements about the cryptate complex [Eu(2.2.2)(NO
3
)]
2+
(i) It is thermodynamically stable in water.
(ii) It is kinetically inert in water.
(iii) It must be prepared under anhydrous conditions.
(iv) The (2.2.2) ligand can be displaced by EDTA
4
-
.
Now select the correct statement below
(i) and (ii) only are correct
correct
incorrect
(ii), (iii) and (iv) are correct
correct
incorrect
(ii) and (iii) only are correct
correct
incorrect
(i) and (iv) only are correct
correct
incorrect
*
not completed
.
Ln
3+
form numerous complexes with crown ethers and their acyclic podand analogues. Select the
incorrect
statement about these complexes from the list below.
[La(18-C-6)(OTf)
3
] is more stable than [Lu(18-C-6)(OTf)
3
].
correct
incorrect
[La(18-C-6)(OTf)
3
] is prepared by addition of 18-C-6 to La(OTf)
3
in water.
correct
incorrect
[Gd(15-C-5)(OTf)
3
] is more stable than [Gd(tetraglyme)(OTf)
3
].
correct
incorrect
[Pr(tetraglyme)(OTf)
3
] is more stable than [Tm(tetraglyme)(OTf)
3
].
correct
incorrect
*
not completed
.
Which of the following pairs of reagents could
not
be used for the synthesis of a homoleptic f-element alkoxide?
[Lu(acac)
3
] + 3Bu
t
OH
correct
incorrect
[Pr{N(SiMe
3
)
2
}
3
] + 3Bu
t
OH
correct
incorrect
[U(NEt
2
)
5
] + 5Pr
i
OH
correct
incorrect
CeCl
3
+ 3KOBu
t
correct
incorrect
*
not completed
.
Select the
incorrect
statement about lanthanoid tris-b-diketonate complexes from the list below.
La(acac)
3
is a polymeric solid.
correct
incorrect
[Eu(dbm)
3
] is Lewis acidic.
correct
incorrect
The majority of [Ln(diket)
3
] complexes are volatile.
correct
incorrect
[Yb(thd)
3
] reacts with Pr
i
OH to form Yb(OPr
i
)
3
correct
incorrect
*
not completed
.
La and U form complexes [M{N(
i
Pr
2
PTe)
2
}
3
] (M = La or U) with the ditellurophosphoramide ligand {N(
i
Pr
2
PTe)
2
}
-
. The average La-Te distance is 6.0 pm greater than the average U-Te distance. The reason for this is:
The ionic radius of La
3+
is 6 pm greater than that of U
3+
.
correct
incorrect
The La complex has a higher coordination number than the U complex.
correct
incorrect
The U-Te bond is stronger than the La-Te bond due to covalent contributions.
correct
incorrect
*
not completed
.
Which of the following ligand types is most likely to be of use in separation of Eu
3+
from Am
3+
?
Dithiophosphinate (R
2
PS
2
-
)
correct
incorrect
Phosphinate (R
2
PO
2
-
)
correct
incorrect
Crown ether
correct
incorrect
Alkoxide (RO
-
)
correct
incorrect
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