TY - JOUR
T1 - Synthesis and structural properties of (diamine)platinum(II) complexes of bis(alkylthio)methylenepropanedioic acid. Insight into bonding mode
AU - Kim, Kwan Mook
AU - Lee, Sung Sil
AU - Jung, Ok Sang
AU - Jun, Moo Jin
AU - Sohn, Youn Soo
N1 - Funding Information:
Support for this research was provided by the Ministry of Science and Technology in Korea.
PY - 1997/3/31
Y1 - 1997/3/31
N2 - New (diamine)platinum(II) complexes of bis(alkylthio)methylenepropanedioate ligands, A2Pt(RS)2C=C(COO-)2 (A=NH3 or A2=trans-(±)-1,2-diaminocyclohexane (DACH); R=CH3 or C2H5), have been prepared and structurally characterized both in the solid state and in solution. The crystal structures of a bis(ethylthio)methylenepropanedioate (BETMP) complex, (DACH)Pt(BETMP)·4H2O (monoclinic, P21, a=11.022(2), b=17.604(4), c=11.426(5) Å, β=93.42(3)°, V=2213(1) Å3, Z=4, R=0.065), and a bis(methylthio)methylenepropanedioate (BMTMP) complex, (DACH)Pt(BMTMP)·3H2O (triclinic, P1, a=9.082(3), b=9.797(3), c=11.493(4) Å, α=72.42(3), β = 74.28(3), β=84.93(3)°, V=938.4(5) Å3, Z=2, R=0.031), exhibit that among the possible chelating modes (O,O′-, O,S- and S,S′-), the present anionic ligands coordinate to the platinum(II) atom only in S,S′-chelating fashion. The bond distances of Pt-S are in the range 2.273(2)-2.276(5) Å. For the title complexes, the diethyl groups of the BETMP ligand occupy anti positions to each other whereas the dimethyl groups of the BMTMP ligand occupy syn positions in the solid state. However, NMR studies disclose that the BMTMP complexes exist as an isomeric mixture of syn and anti forms (1:2) in contrast to the retention of the anti isomeric form of the BETMP complexes in solution.
AB - New (diamine)platinum(II) complexes of bis(alkylthio)methylenepropanedioate ligands, A2Pt(RS)2C=C(COO-)2 (A=NH3 or A2=trans-(±)-1,2-diaminocyclohexane (DACH); R=CH3 or C2H5), have been prepared and structurally characterized both in the solid state and in solution. The crystal structures of a bis(ethylthio)methylenepropanedioate (BETMP) complex, (DACH)Pt(BETMP)·4H2O (monoclinic, P21, a=11.022(2), b=17.604(4), c=11.426(5) Å, β=93.42(3)°, V=2213(1) Å3, Z=4, R=0.065), and a bis(methylthio)methylenepropanedioate (BMTMP) complex, (DACH)Pt(BMTMP)·3H2O (triclinic, P1, a=9.082(3), b=9.797(3), c=11.493(4) Å, α=72.42(3), β = 74.28(3), β=84.93(3)°, V=938.4(5) Å3, Z=2, R=0.031), exhibit that among the possible chelating modes (O,O′-, O,S- and S,S′-), the present anionic ligands coordinate to the platinum(II) atom only in S,S′-chelating fashion. The bond distances of Pt-S are in the range 2.273(2)-2.276(5) Å. For the title complexes, the diethyl groups of the BETMP ligand occupy anti positions to each other whereas the dimethyl groups of the BMTMP ligand occupy syn positions in the solid state. However, NMR studies disclose that the BMTMP complexes exist as an isomeric mixture of syn and anti forms (1:2) in contrast to the retention of the anti isomeric form of the BETMP complexes in solution.
KW - Coordination mode
KW - Crystal structures
KW - Dithioether complexes
KW - Platinum complexes
KW - Substituted malonate complexes
UR - http://www.scopus.com/inward/record.url?scp=0007880303&partnerID=8YFLogxK
U2 - 10.1016/s0020-1693(96)05445-x
DO - 10.1016/s0020-1693(96)05445-x
M3 - Article
AN - SCOPUS:0007880303
SN - 0020-1693
VL - 256
SP - 217
EP - 222
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 2
ER -