With no explanation, label each line with "O", "other-chemicalthing", "organization-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
general
name
metallocene
is
derived
from
ferrocene
,
(
C5H5
)
2Fe
or
Cp2Fe
,
systematically
named
According
to
the
IUPAC
definition
,
a
metallocene
contains
a
transition
metal
and
two
cyclopentadienyl
ligands
coordinated
in
a
sandwich
structure
,
i.e.
,
the
two
cyclopentadienyl
anions
are
on
parallel
planes
with
equal
bond
lengths
and
strengths
.
The:O
general:O
name:O
metallocene:other-chemicalthing
is:O
derived:O
from:O
ferrocene:other-chemicalthing
,:O
(:other-chemicalthing
C5H5:other-chemicalthing
):other-chemicalthing
2Fe:other-chemicalthing
or:O
Cp2Fe:other-chemicalthing
,:O
systematically:O
named:O
According:O
to:O
the:O
IUPAC:organization-other
definition:O
,:O
a:O
metallocene:O
contains:O
a:O
transition:O
metal:O
and:O
two:O
cyclopentadienyl:other-chemicalthing
ligands:O
coordinated:O
in:O
a:O
sandwich:O
structure:O
,:O
i.e.:O
,:O
the:O
two:O
cyclopentadienyl:other-chemicalthing
anions:O
are:O
on:O
parallel:O
planes:O
with:O
equal:O
bond:O
lengths:O
and:O
strengths:O
.:O