TY - JOUR
T1 - A platinum-cyclobutene complex
T2 - preparation and structure of bis(triphenylphosphine)-(1,2-dicyanocyclobutene)platinum(0)
AU - Osborne, Robert B.
AU - Lewis, Huntley C.
AU - Ibers, James A.
N1 - Funding Information:
HCL is grateful to the National Science Foundation for a Science Faculty Professional Development Award and to the University of Wisconsin Center System for a sabbatical leave. This work was supported by the National Science Foundation (CHE76-10335). We thank Johnson IMatthey, Inc., Malvem, Pennsylvania for the loan of Pt metal.
PY - 1981/3/17
Y1 - 1981/3/17
N2 - The reaction of Pt(C2H4)(PPh3)2 with 1,2-dicyanocyclobutene affords the new complex bis(triphenylphosphine)(1,2-dicyanocyclobutene)platinum(0), Pt((NC) CC(CN)CH2CH2)(PPh3)2. The complex has been characterized spectroscopically and by means of a low-temperature X-ray diffraction study. The 31P NMR spectrum displays a singlet at 24.34 ppm downfield from external 85% H3PO4 with 195Pt satellites (1J(195Pt31P) 3561 Hz), consistent with the equivalence of the two PPh3 groups in the complex. The material crystallizes in space group {A figure is presented} P21/n of the monoclinic system with four formula units in a cell at -150°C of a 14.525(3), b 11.981(3),c 19.721(6) Å, β 98.22(1)°. Based on a total of 14108 observations and 173 variables the structure has been refined to values of R and Rw on Fo2 of 0.044 and 0.073, respectively. The cyclobutene is attached to the P2Pt moiety through interaction with the double bond. The resultant P2PtC2 portion of the molecule is essentially planar. The PtP distances are 2.284(1) and 2.301(1) Å and the PtC distances are 2.091(3) and 2.077(3) Å. The 1,2-dicyanocyclobutene portion of the complex is essentially planar, with the angle between this plane and that of the P2PtC2 plane being 62.6°. The single bonds within the ring have lengths of 1.542(4), 1.546(5), and 1.541(5) Å, while the former double bond has on coordination lengthened to a value of 1.504(4) Å.
AB - The reaction of Pt(C2H4)(PPh3)2 with 1,2-dicyanocyclobutene affords the new complex bis(triphenylphosphine)(1,2-dicyanocyclobutene)platinum(0), Pt((NC) CC(CN)CH2CH2)(PPh3)2. The complex has been characterized spectroscopically and by means of a low-temperature X-ray diffraction study. The 31P NMR spectrum displays a singlet at 24.34 ppm downfield from external 85% H3PO4 with 195Pt satellites (1J(195Pt31P) 3561 Hz), consistent with the equivalence of the two PPh3 groups in the complex. The material crystallizes in space group {A figure is presented} P21/n of the monoclinic system with four formula units in a cell at -150°C of a 14.525(3), b 11.981(3),c 19.721(6) Å, β 98.22(1)°. Based on a total of 14108 observations and 173 variables the structure has been refined to values of R and Rw on Fo2 of 0.044 and 0.073, respectively. The cyclobutene is attached to the P2Pt moiety through interaction with the double bond. The resultant P2PtC2 portion of the molecule is essentially planar. The PtP distances are 2.284(1) and 2.301(1) Å and the PtC distances are 2.091(3) and 2.077(3) Å. The 1,2-dicyanocyclobutene portion of the complex is essentially planar, with the angle between this plane and that of the P2PtC2 plane being 62.6°. The single bonds within the ring have lengths of 1.542(4), 1.546(5), and 1.541(5) Å, while the former double bond has on coordination lengthened to a value of 1.504(4) Å.
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U2 - 10.1016/S0022-328X(00)89181-0
DO - 10.1016/S0022-328X(00)89181-0
M3 - Article
AN - SCOPUS:0010992187
VL - 208
SP - 125
EP - 135
JO - Journal of Organometallic Chemistry
JF - Journal of Organometallic Chemistry
SN - 0022-328X
IS - 1
ER -