Synthesis and molecular structure of platinum(II) complexes with cyclotriphosphazenes containing pyridylalkylamino and pyridylmethoxy groups

Article abstract of DOI:10.1134/S1070363207110059

The interaction of platinum(II) nitrile complexes with polydentate ligands, pentaphenoxy(2-pyridylmethylamino)cyclotriphosphazene (L¹), pentaphenoxy(3-pyridylmethylamino)cyclotriphosphazene (L²), pentaphenoxy[2-(2-pyridyl)ethylamino]cyclotriphosphazene (L³), and pentaphenoxy(2-pyridylmethoxy)-cyclotriphosphazene (L⁴), was studied. The synthesized complexes were characterized by single-crystal X-ray diffraction, ¹H and ³¹P NMR spectroscopy, IR spectroscopy, FAB mass spectrometry, and other methods. In complexation of phosphazenes L¹-L³ with Pt(II) ions, nitrogen atoms of the pyridine ring and alkylamine fragment participate in the coordination to form chelate rings. In the complex with L⁴, the substituted phosphazene is coordinated via nitrogen atoms of the pyridyl group and cyclotriphosphazene ring to form a sevenmembered ring.

Full text of DOI:10.1134/S1070363207110059

ISSN 1070-3632, Russian Journal of General Chemistry, 2007, Vol. 77, No. 11, pp. 1874 1879.
Pleiades Publishing, Ltd., 2007.
Original Russian Text S.A. Simanova, T.V. Kuznetsova, V.N. Demidov, E.A. Aleksandrova, U. Diefenbach, 2007, published in Zhurnal Obshchei Khimii,
2007, Vol. 77, No. 11, pp. 1816 1822.
Synthesis and Molecular Structure of Platinum(II) Complexes
with Cyclotriphosphazenes Containing Pyridylalkylamino
and Pyridylmethoxy Groups
S. A. Simanovaa, T. V. Kuznetsovaa, V. N. Demidova,
E. A. Aleksandrovaa, and U. Diefenbachb
a St. Petersburg Institute of Technology (Technical University),
Moskovskii pr. 26, St. Petersburg, 198013 Russia
e-mail: T.V.Kouznetsova@mail.ru
b Free University of Berlin, Berlin, Germany
Received May 31, 2007
Abstract The interaction of platinum(II) nitrile complexes with polydentate ligands, pentaphenoxy(2-
pyridylmethylamino)cyclotriphosphazene (L1), pentaphenoxy(3-pyridylmethylamino)cyclotriphosphazene
(L2), pentaphenoxy[2-(2-pyridyl)ethylamino]cyclotriphosphazene (L3), and pentaphenoxy(2-pyridylmethoxy)-
cyclotriphosphazene (L4), was studied. The synthesized complexes were characterized by single-crystal X-ray
1
diffraction, H and 31P NMR spectroscopy, IR spectroscopy, FAB mass spectrometry, and other methods. In
complexation of phosphazenes L1 L3 with Pt(II) ions, nitrogen atoms of the pyridine ring and alkylamine
fragment participate in the coordination to form chelate rings. In the complex with L4, the substituted phos-
phazene is coordinated via nitrogen atoms of the pyridyl group and cyclotriphosphazene ring to form a seven-
membered ring.
DOI: 10.1134/S1070363207110059
Published data on coordination chemistry of cyclo-
triphosphazenes [1 6] show that phosphazenes with
a large number of donor atoms such as N, P, and O
are of most interest. These ligands can coordinate with
metal ions in different fashions depending on the
steric conditions and nature of the central ion. A sys-
tematic study of the reactivity of phosphazenes with
pyridylalkylamino and pyridylalkoxy groups was
made in [4, 7]. As shown by Chandrasekhar and
Nagendran [6], cyclotriphosphazenes with pyrazole
and dimethylamino groups coordinate with the metal
ion via nitrogen atoms of the pyrazole ring and/or
nitrogen atoms of the phosphazene ring. Depending
on the type of the complexing ion and nature of sub-
stituents R1 and R2 in polydentate cyclotriphospha-
zenes (N3P3R1xRy2, x + y = 6), in each particular case
the formationn of diverse coordination compounds can
be expected, including polynuclear complexes which
are of great interest.
conductors. In addition, phosphazene polymers can be
used as sorbents for recovering platinum from organic
media. In turn, data obtained for small molecular
models such as cyclotriphosphazenes give certain
insight into processes occurring in reactions with
polymeric ligands.
Justin Thomas et al. [5] prepared platinum(II) com-
plexes with cyclotriphosphazenes L containing gemi-
nal pyrazole and dimethylpyrazole groups by reaction
with [Pt(PhCN)2Cl2]. This reaction yields complexes
of the composition [PtLCl2] in which the ligand L is
coordinated via nitrogen atoms of the adjacent pyra-
zole groups to form a six-membered chelate ring
(Scheme 1).
Scheme 1.
Ph
Ph
N
N
P
N
P
N N
Cl
Cl
Pt
Platinum complexes of cis configuration with vari-
ous cyclo- and polyphosphazene ligands containing
pyridylalkylamino groups were described in [2 4].
Particularly promising is complexation of platinum
with polymeric phosphazenes, because such macro-
molecular structures find use as catalysts and ionic
P
N
N
Pz
Pz
It was found previously that cyclotriphosphazene
N3P3(OC6H5)5R, where R is 2-pyridylmethylamino
1874

SYNTHESIS AND MOLECULAR STRUCTURE OF PLATINUM(II) COMPLEXES
1875
1
Table 1. Characteristic vibration frequencies (cm ) of R-pentaphenoxycyclotriphosphazenes and Pt(II) phosphazene
complexes
Assignment
(NH)
L1
[PtL1Cl2]
L2
[PtL2Cl2]
L3
3350
1590 s
1480 s
1210
[PtL3Cl2]
L4
[PtL4Cl2]
3260 w 3293 w
3157 w
1585 s
1485 s
1220
3420 w
1592 m
1490 s
1180
3428 w
1589 m
1487 s
1179
(CCaryl
(CCaryl
(PN)
)
)
1580 s
1476 s
1216
1590 m
1488 s
1260
1590 s
1490 s
1200 1120 vs 1180 1120 vs
1589 m
1488 s
1112 vs 1177 vs
1120 vs
940 s
1585
1120 vs
944 s
1652 m
1120 vs
940 s
1590
1164 vs
941 s
1605 m
(POaryl
(CN)
)
940 s
1580
945 s
1612 m
950 s
1590
958 s
1589 m
group, forms complexes with Cu(II) and Pt(II) with
a metal to ligand ratio of 1 : 2 (Cu2+) or 1 : 1 (Pt2+),
with both nitrogen atoms of the pyridylmethylamino
fragment of the phosphazene ligand participating in
the complexation [4]. With Co(II), the complex is
formed with one N3P3(OC6H5)5R molecule which is
coordinated via nitrogen atom of the phosphazene ring
and pyridyl nitrogen atom. In complexes of metals
with L2 and L4, the metal ion always coordinates ex-
clusively with the pyridine group [8 10]. Preparation
of the complex [PtL1Cl2] from PtCl2 and L1 was
described previously in [4]. We expected that the
yield of the complexes could be increased by taking
the nitrile complexes [Pt(RCN)2Cl2] as starting com-
pounds, because of high solubility of these complexes
in organic solvents and lability of nitrile ligands in
replacement reactions.
atom in the coordination. The characteristic bands in
the IR spectra of Pt(II) complexes with cyclotriphos-
phazenes (L1 L4) and of the free phosphazenes are
given in Table 1.
1
In the H NMR spectrum of [PtL3Cl2] (Fig. 1), all
the signals are shifted upfield, and the CH2 protons of
the phosphazene ligand become nonequivalent. This
nonequivalence is attributable to closure of a nonplan-
ar six-membered ring. In the 31P NMR spectra of
[PtL3Cl2], the signals (X2B pattern) do not shift rela-
tive to the free ligand, which indicates that the nitro-
gen atoms of the phosphazene ring do not participate
in the complexation [ , ppm: 7.12 d (PX, JXB
69.8 Hz), 7.65 d (PX, JXPB 82.8 Hz), and 21.33 d.d
(PB, JXB 74.1 Hz, JXB 80.7 Hz).
The structure of [PtL3Cl2] was proved by single
crystal X-ray diffraction (Fig. 2). The structural data
and measurement conditions are given in Table 2.
The selected bond lengths and angles are given in
Table 3. The nearest surrounding of the central Pt2+
ion in this compound is almost undistorted planar
square, and all the bond lengths and angles in the
coordination core are close to those reported previous-
ly for [PtL1Cl2] [4]. The bond lengths and angles in
the P3N3 ring are close to those reported for noncoor-
dinated pyridylalkylaminocyclotriphosphazenes [7].
In this study we examined the reactions of Pt(II)
aceto- and propionitrile complexes [Pt(MeCN)2Cl2]
and [Pt(EtCN)2Cl2] with cyclotriphosphazenes of the
general formula N3P3(OC6H5)5R, where R is 2-pyri-
dylmethylamino (L1), 3-pyridylmethylamino (L2),
2-(2-pyridyl)ethylamino (L3), or 2-pyridylmethoxy
(L4) group and analyzed the crystal structures of the
complexes obtained. This paper continues our previ-
ous studies [11, 12]. Platinum(II) complexes of the
general formula [PtLnCl2] were prepared by heating
cis-[Pt(RCN)2Cl2] (R = Me, Et) with appropriate cy-
clotriphosphazene Ln in 1 : 1.1 ratio in acetonitrile or
dichloromethane. The compounds were characterized
1
by IR spectroscopy, H and 31P NMR spectroscopy,
FAB mass spectrometry, and elemental analysis (C, H,
N, Pt). Particular attention was given to X-ray diffrac-
tion study of the complexes [PtL3Cl2] and [PtL4Cl2].
In the IR spectra of the compounds [PtLnCl2] (Ln =
L1 L4, Table 1), the band of stretching vibrations of
the C=N bonds of the pyridine fragment shifts from
1
1580 1590 (for free phosphazene) to 1600 1650 cm
20.10
5
P, ppm
(for the complex), which suggests, according to pub-
lished data [7], participation of the pyridine nitrogen
31
3
Fig. 1. P NMR spectrum of [PtL Cl ].
2
RUSSIAN JOURNAL OF GENERAL CHEMISTRY Vol. 77 No. 11 2007

1876
SIMANOVA et al.
Table 2. Crystallographic data and unit cell parameters for
Scheme 2.
[PtL3Cl2] and [PtL4Cl2]
OPh
PhO
Parameter
[PTL3Cl2]
[PTL4Cl2]
N
P
OPh
OPh
N
P
Formula
Molecular
weight
Crystal size,
mm
C37H34Cl2N5O5P3Pt C36H31Cl2N4O6P3Pt
PhO P
N
Cl
Cl
987.59
0.32 0.11 0.06
293(2)
974.55
0.44 0.14 0.10
293(2)
Pt
O
N
H2C
Temperature,
K
Wavelength,
0.71073
0.71073
sion is proved by a single crystal X-ray diffraction
study of [PtL4Cl2] (Fig. 4; Tables 2, 3).
Crystal
system
Space group
a,
b,
c,
Triclinic
Triclinic
The nearest surrounding of the Pt2+ ion in [PtL4Cl2]
is square-planar, as in [PtL3Cl2]. Two P N bonds in
the phosphazene ring are somewhat longer [P1 N1
P1
P1
10.385(2)
12.127(2)
15.413(3)
90.97(3)
95.87(3)
90.37(3)
1930.6(6)
2
10.627(2)
12.304(2)
15.018(3)
92.09(3)
103.92(3)
91.53(3)
1903.5(6)
2
and P2 N1 bond lengths are 1.623(5) and 1.605(5)
]
than in the noncoordinated phosphazene L4 [7]. This
may be due to involvement of the lone electron pair of
the phosphazene nitrogen atom in a donor acceptor
bond with the platinum ion and to possible distortion
of the quasi-aromaticity of the phosphazene ring.
Similar effect was found previously in the complex of
Co(II) with L1 in which the ligand L1 is also coordi-
nated via one of the nitrogen atoms of the phospha-
zene ring and pyridine nitrogen atom [4]. It is interest-
ing that the reaction of L4 with copper(II) nitrate
yields a complex of trans structure in which two lig-
ands are coordinated with the Cu(II) ion in the mono-
, deg
, deg
, deg
3
Volume,
Z
Density,
1.699
1.700
3
g cm
1
, mm
3.946
7177
4.002
6727
Number of
unique
reflections
Number of
reflections
with
6765
6322
Cl1
Cl2
I > 2 (I)
Final R1
wR2
Pt
N4
C2
0.0227
0.0523
0.0368
0.0867
N5
C3
C9
C10
C7
C1
N2
The reaction of [Pt(EtCN)2Cl2] with phosphazene
L4 containing pyridylmethoxy groups yields the com-
C5
6
C
C29
F1
C28
C27
C16
N1
C13
C15
C19
C11
plex [PtL4Cl2] in which the ligand L4 is coordinated
via nitrogen atoms of the pyridine and phosphazene
rings to form a seven-membered ring (Scheme 2).
This coordination mode could be expected, because of
low affinity of methoxyl oxygen for Pt(II).
C12
O3
C17
P3
P2
C14
C26
O4
N3
C18
C31
O2
O5
C32
C25
C24
C21
C22
The 31P NMR spectrum of [PtL4Cl2] (Fig. 3) dif-
fers essentially from the 31P NMR spectra of com-
plexes with ligands L1 L3. In this case, we deal with
a strongly coupled ABC system, which convincingly
proves the nonequivalence of all the three phosphorus
atoms of the phosphazene ring and hence coordination
of Pt2+ via phosphazene nitrogen atom. This conclu-
C37
C36
C23
C33
C34
C35
3
Fig. 2. Molecular structure of [PtL Cl ].
2
RUSSIAN JOURNAL OF GENERAL CHEMISTRY Vol. 77 No. 11 2007

SYNTHESIS AND MOLECULAR STRUCTURE OF PLATINUM(II) COMPLEXES
1877
Table 3. Selected bond lengths (d) and bond angles ( ) in [PtL3Cl2] and [PtL4Cl2]
Bond
Pt N5
d,
Bond
P3 O4
d,
Angle
, deg
Angle
O1P1N1
, deg
2.016(3)
2.092(3)
2.2821(12)
2.3012(13)
1.573(3)
1.574(3)
1.578(3)
1.724(3)
1.567(3)
1.581(3)
1.582(3)
1.592(3)
1.576(3)
1.578(3)
1.579(3)
1.584(3)
1.500(6)
1.499(6)
2.075(5)
2.019(6)
2.267(2)
2.280(2)
1.554(6)
1.623(5)
1.559(6)
1.605(5)
1.581(6)
N5PtN4
N5PtCl2
N4PtCl2
N5PtCl1
N4PtCl1
Cl2PtCl1
O1P1N1
O1P1N2
N1P1N2
O1P1N4
N1P1N4
N4PtN1
N4PtCl2
N1PtCl2
N4PtCl1
N1PtCl1
P2N1Pt
Cl2PtCl1
P1N1Pt
C6N4Pt
C2N4Pt
N2P1O2
N2P1O1
O2P1O1
N2P1N1
O2P1N1
P2N1P1
P2N3P3
88.41(14)
89.83(10)
177.90(11)
176.55(10)
90.61(11)
91.21(5)
112.22(17)
111.06(17)
117.51(17)
95.76(16)
108.64(18)
89.7(2)
177.53(17)
90.90(16)
89.01(16)
177.36(16)
120.5(3)
90.53(7)
116.8(3)
119.1(5)
122.4(5)
113.1(3)
105.7(3)
106.4(3)
116.3(3)
110.1(3)
110.3(3)
114.1(3)
100.7(3)
115.5(3)
Pt N4
Pt Cl2
Pt Cl1
P1 O1
P1 N1
P1 N2
P1 N4
P2 N3
P2 O3
P2 N1
P2 O2
P3 N3
P3 O5
P3 N2
C1 C2
C2 C3
Pt N1
Pt N4
Pt Cl2
Pt Cl1
P1 N2
P1 N1
P2 N3
P2 N1
P3 N3
N3P2O3
N3P2O4
O3P2O4
N3P2N1
N2P1N4
N3P2O3
N3P2N1
O3P2N1
N3P2O2
O3P2O2
N1P2O2
N3P3O5
N3P3O4
O5P3O4
N3P3N2
O5P3N2
O4P3N2
O3P2N1
O4P2N1
O6P3N2
O6P3O5
O5P3N2
O6P3N3
O5P3N3
N2P3N3
P1N2P3
109.40(16)
110.75(17)
118.69(17)
105.03(17)
106.54(16)
104.91(15)
110.14(16)
111.38(16)
110.29(17)
99.09(15)
117.40(17)
106.19(17)
110.89(16)
111.6(3)
103.5(3)
109.0(3)
95.6(3)
112.3(3)
113.4(3)
110.0(3)
115.0(3)
123.8(4)
104.8(3)
122.0(3)
124.9(4)
dentate fashion via pyridine nitrogen atoms [6]. The
Pt N and Pt Cl bond lengths in [PtL4Cl2] are close to
those found in [PtL1Cl2] and [PtL3Cl2] (Table 3), and
also in some other related compounds [4, 7, 13]. The
steric effect of the 2-pyridylmethoxy group linked to
the phosphazene ring additionally favors formation of
a square-planar cis complex with the Pt(II) : ligand
ratio of 1 : 1.
and Bruker WM 360 (145 MHz for 31P, with external
reference). The mass spectra were taken on the follow-
ing mass spectrometers: EI, Varian MAT 711 and
Varian MAT 112; FAB+, Varian MAT CH5. Elemen-
tal analysis (C, H, N) was performed with a Perkin
Elmer CHN Analyzer 240; the platinum content was
determined by the standard procedure involving de-
composition of samples with sulfuric acid. The crystal
structures of the complexes were determined with
Enraf Nonius CAD-4 automatic four-circle diffrac-
tometers (Karpov Institute of Physical Chemistry,
Moscow, Russia).
EXPERIMENTAL
Cyclotriphosphazenes L1 L4 were prepared by the
procedure described in [1, 7]. The starting platinum(II)
nitrile complexes cis-[Pt(RCN)2Cl2] (R = Me, Et)
were synthesized as described in [14].
The complexes were prepared by the procedures
described in [11, 12].
Dichloro[pentaphenoxy(2-pyridylmethylamino)-
cyclotriphosphazene]platinum, [PtL1Cl2]. A solution
of 85 mg of pentaphenoxy(2-pyridylmethylamino)-
cyclotriphosphazene in 2 ml of dichloromethane was
added to a solution of 40 mg of [Pt(EtCN)2Cl2] in
2 ml of dichloromethane. The mixture was refluxed at
The IR spectra of the compounds were recorded on
a 5SXC Nicolet spectrometer. Samples were prepared
as KBr pellets. The NMR spectra were recorded on
the following devices: 31P, Jeol LA 400 (162 MHz,
1
with external reference; H and 31P, Bruker AM 250
RUSSIAN JOURNAL OF GENERAL CHEMISTRY Vol. 77 No. 11 2007

1878
SIMANOVA et al.
P, ppm
11
10
9
8
7
6
5
4
3
31
4
Fig. 3. P NMR spectrum of [PtL Cl ].
2
50 C for 4 h. After cooling, the solution was filtered
and the solvent was removed. The resulting orange oil
was recrystallized from dichloromethane diethyl ether
to obtain yellow transparent crystals. Yield 39.2 mg
(37%), mp 190 C. Mass spectrum [M 973.6]; m/z:
974 [M + H], 938 [M HCl], 902 [M 2HCl], 708,
600, 507, 383, 307, 217, 154, 107, 77. Found, %: C
42.27; H 3.25; N 7.13; Pt 20.98. C36H32Cl2N5O5P3Pt
Cl1
C5
N4
C6
C4 C3
Cl2
Pt
C2
O2
C1
O1
C20
C19
C21
O4
N1
C12
C11
C10
C9
C18
P1
C22
C23
C17
C16
O3
C7
N2
C8
C27
C24
C28
C26
C25
C13
C14
N3
C29
C30
P3
O5
C32
O6
C31
C36
C33
C34
C35
4
Fig. 4. Molecular structure of [PtL Cl ].
2
RUSSIAN JOURNAL OF GENERAL CHEMISTRY Vol. 77 No. 11 2007

SYNTHESIS AND MOLECULAR STRUCTURE OF PLATINUM(II) COMPLEXES
1879
(973.6). Calculated, %: C 44.39; H 3.28; N 7.19; Pt
20.04.
N 5.67. C36H31Cl2N4O6P3Pt (974.56). Calculated, %:
C 44.37; H 3.21; N 5.75.
Dichloro[pentaphenoxy(3-pyridylmethylamino)-
cyclotriphosphazene]platinum, [PtL2Cl2]. A pre-
heated solution of 0.743 g of pentaphenoxy(3-pyri-
dylmethylamino)cyclotriphosphazene in 15 ml of
acetonitrile was added to a solution of 0.360 g of
[Pt(MeCN)2Cl2] in 10 ml of acetonitrile. The mixture
was heated for 4 h, after which it was evaporated and
the resulting oil was recrystallized from acetone
toluene, 1 : 1. Yield 56 mg (17%). Found, %: C 44.01;
H 3.45; N 7.64. C36H32Cl2N5O5P3Pt. Calculated, %:
C 44.39; H 3.28; N 7.19.
ACKNOWLEDGMENTS
The study was financially supported by the Depart-
mental Target Program Development of the Scientif-
ic Potential of Higher School (grant RNP.2.1.1.1277).
REFERENCES
1. Diefenbach, U., Phosphazenes: A Worldwide Insight,
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2. Allcock, H.R., Allen, R.W., and O’Brien, J.P., J. Am.
Chem. Soc., 1977, vol. 99, no. 12, p. 3984.
Dichloro{pentaphenoxy[2-(2-pyridyl)ethylami-
no]cyclotriphosphazene}platinum, [PtL3Cl2]. An
0.300-g portion of [Pt(MeCN)2Cl2] was dissolved
with slight heating ( 30 C) in 10 ml of acetonitrile,
and a solution of 0.762 g of pentaphenoxy[2-(2-py-
ridyl)ethyl- amino]cyclotriphosphazene in 20 ml of
acetonitrile, heated to 40 C, was added dropwise. The
mixture was heated for approximately 0.5 h at 60 C;
in so doing, the color of the reaction mixture changed
from pale yellow to bright yellow. After that, the
solvent was evaporated to a minimal volume. The
mixture was separated on a column packed with silica
gel L 40/100 m (Chemapol), eluent acetone chloro-
form, 1 : 5. The crystals were grown from the middle
fraction, Rf 0.8, acetone chloroform, 1 : 5. Yield
194 mg (22.8%), mp 145 C. Mass spectrum [M
987.1]; m/z: 988 [M + H], 951 [M HCl], 915 [M
2 HCl], 722, 600, 307, 217, 154, 136, 107, 89, 77.
Found, %: C 45.15; H 3.50; N 6.94; Pt 19.60. C37H34
Cl2N5O5P3Pt (973.6). Calculated, %: C 45.00; H 3.47;
N 7.09; Pt 19.75.
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Dichloro[pentaphenoxy(2-pyridylmethoxy)cyclo-
triphosphazene]platinum, [PtL4Cl2]. Weighed por-
tions of [Pt(EtCN)2Cl4] (0.1 g) and pentaphenoxy(2-
pyridylmethoxy)cyclotriphosphazene (L4, 0.189 g)
were mixed in a chloroform solution (3 ml). The re-
sulting mixture was thoroughly stirred until the com-
ponents dissolved completely, after which it was
heated at 50 C for 1.5 h. Then the solvent was re-
moved, and the oily residue was crystallized from di-
chloromethane acetone chloroform toluene CCl4,
1 : 1 : 1 : 1 :1. Rf 0.75, acetone chloroform, 1 : 3.
11. Simanova, S.A., Kuznetsova, T.V., Diefenbach, U.,
and Demidov, V.N., Zh. Obshch. Khim., 2006, vol. 76,
no. 4, p. 565.
12. Simanova, S.A., Kuznetsova, T.V., Diefenbach, U.,
and Demidov, V.N., Abstracts of Papers, XXI Mezh-
dunarodnaya konferentsiya po koordinatsionnoi
khimii (XXI Int. Conf. on Coordination Chemistry),
Kiev, 2003, p. 363.
13. Herbis, R.H., Croft, M., Coyer, M.J., Bilash, B., and
Sahiner, A., Inorg. Chem., 1994, vol. 33, no. 11,
p. 2422.
Yield 48 mg (18.5%), mp 161 C. Mass spectrum
(EI/70 eV) [M 974.6]; m/z: 1969 [2M 2H + Na, 9%],
1911 [2M HCl, 27%], 1875 [2M 2HCl, 4%], 1801
[2M 4HCl, 2%], 1459 [2M 4 HCl L4, 15%],
1097 [2M 4HCl 2L4, 4%], 996 [M H + Na,
21%], 974 [M, 8%], 938 [M HCl, 39%], 902 [M
2HCl, 100%], 808 [25%]. Found, %: C 44.28; H 3.23;
14. Sintez kompleksnykh soedinenii metallov platinovoi
gruppy (Synthesis of Coordination Compounds of
Platinum Group Metals), Chernyaev, I.I., Ed.,
Moscow: Nauka, 1964.
RUSSIAN JOURNAL OF GENERAL CHEMISTRY Vol. 77 No. 11 2007