27
卷
4
期
2008.4
结
4
句化,学
(J
IEGOU
HUAXUE)
Chinese
J.
Struct.
Chem.
Vo
l.
27
,
No
.4
481-490
Predict~on
of
Aqueous Solubility for
209 Polychlorinated Diphenyl
Ethers
from
Molecular
Structural
Parameters
by
DFT
Method
①
XIE
Ya-Jie
LIU
Hong-Xia
WANG
Zun-
Yao@
ZHU
Li-Dan
(School
of
Biological
and
Chemical Engineering, Jiaxing University, Jiaxing, Zhejiang 31400
1,
China)
ABSTRACT
Optimized calculations
of
209 polychlorinated diphenyl ethers (PCDEs) and
diphenyl ethers were
canied out at the B3LYP/6-3IG* level with the Gaussian 98 program. Based
on the theoretical linear solvation energy relationship (TLSER) model
, the obtained structural
parameters were taken as theoretical descriptors to establish the novel QSPR model for predicting
agueous solubility (-lgSw)
of
PCDEs.
Th
e model obtained
in
this work contains two variables: mean
molecular polarizability
(α)
and the most positive
p
缸
tial
charge
on
a hydrogen atom
(qW)
,
of
which
R
2
= 0.9606 and
SD
= 0
.3
2.
And the results
of
cross-validation test also show that the model exhibits
optimum stability and better predictive power. Moreover
, the predictive power
of
the new model
is
better than that
of
MCIs method.
Keywords: persistent organic
pollu
臼
nts
(POPs), polychlorinated diphenyl ethers
(PCDE
纱,
aquωus
solubility
(-l
gS
w)
, quantitative
structure-proper
叮
relationship
(QSP
酌,
density
functional
thωry
(D
FT)
method
1 INTRODUCTION
Polychlorinated diphenyl ethers (PCDEs) repre-
sent a group
of
halogenated aromatic compounds,
which are structurally located between polychlori-
nated biphenyls (PCBs) and polychlorinated diben-
zofurans
(PCDFsi"2
1
.
According
to
the difference
of
the numbers and positions
of
constituted chlorine
atoms
, there are 209 possible structural patterns
of
PCDEs, similar
to
the situation
of
PCBs. They have
been found
as
by-products
of
many chemical com-
pounds
, such
as
technical chlorophenols and chlori-
nated phenoxyacetic acids
,
etc[31
, And PCDEs have
been identified at the levels
of
lO
O~
1000
mg
/k
g
as
impurities in chlorophenol preparations
f4
,
51.
As
a
Received 4 Ju!y 2007; accepted 28 September
2
∞
7
result, PCDEs have been detected in a wide range
of
environmental samples
l61
.
PCDEs are a subfamily
of
persistent organic
pollutants
(POPsFl. In contrast to other POPs, such
as
PCDD
lF
s, PCBs or PCNs, data concerning
environmental levels
of
PCDEs are rather scarce.
Among different
reas
∞
s
,
it is probably due to the
fact that model substances
of
PCDEs were not com-
mercially available until recent years
f81
. POPs are
now
of
great concern, especially after more than
ninety
.coun
时
es
all over the world signed the Stock-
holm Convention about POPs in May
, 200
1.
As po-
tential POPs
, PCDEs' risk assessment and exposure
evaluation have received more and more resear-
chers' interes
t.
(Thi
s work was funded
by
阳
973
Nation
aI
Basic
R
臼
earch
阳
'gram
ofChina
(2003CB415
∞
2)
and the China Postdoctorai
Scienc
喝
Foundation
(No. 2003033486)
( Corresponding
au
由
or.
Te!:
13957341008, E-ma
i\:
wangzun315cn@163.com