Functional groups give specific properties to organic compounds and increase reactivity. [207] Therefore, it is necessary to make functional compounds to detect gas. After the reaction of these functional groups with the target gas, as shown in Figure 9. b, the functional groups change to other functional groups, and, as a result, the color of the organic compounds changes. Transition metal complexes are commonly colored because of electronic transitions inside the energy level of d orbitals which might be effortlessly affected by ligands across the transition metallic ions. while coordination complexes are shaped via transition metals, the d-orbitals of the transition metal (inner) have interaction with the electron cloud of the ligands (outdoor) in this type of way that the d orbitals have non-degeneracy of electrons, as proven in Fig. 2c. If ligands are modified or substituted through surroundings, the state of electrons might be changed and absorb the various wavelengths of lights [24]. This phenomenon is known as Spin Crossover (SCO). Low transition complexes which have d4 and d7 orbital states commonly display spin-crossover [25]. Spin crossover properties may be exert to colorimetric gas sensing. The reaction among gas and ligands linked to center transition metal ion induces ligand substitution or exchange. As a end result, spin crossover happens, and we will detect the gas.
Functional
groups
give specific properties to organic compounds and increase reactivity. [207]
Therefore
, it is necessary to
make
functional
compounds to detect
gas
. After the reaction of these
functional
groups
with the target
gas
, as shown in Figure 9.
b
, the
functional
groups
change
to other
functional
groups
, and,
as a result
, the color of the organic compounds
changes
.
Transition
metal
complexes are
commonly
colored
because
of electronic
transitions
inside the energy level of d orbitals which might be
effortlessly
affected
by ligands across the
transition
metallic ions.
while
coordination complexes
are shaped
via
transition
metals
, the d-orbitals of the
transition
metal
(inner) have interaction with the electron cloud of the ligands (outdoor) in this type of way that the d orbitals have non-degeneracy of electrons, as proven in Fig. 2c. If ligands
are modified
or substituted through surroundings, the state of electrons might be
changed
and absorb the various wavelengths of lights [24]. This phenomenon
is known
as Spin Crossover (SCO). Low
transition
complexes which have d4 and d7 orbital states
commonly
display spin-crossover [25]. Spin crossover properties may be
exert
to colorimetric
gas
sensing. The reaction among
gas
and ligands linked to center
transition
metal
ion induces ligand substitution or exchange. As
a
end
result, spin crossover happens, and we will detect the
gas
.