| Formation and X-ray Structures of PCP Ligand Based Platinum(II) and Palladium(II) Macrocycles. | |
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MedLine Citation:
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PMID: 11666888 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The coordination behavior prior to C-M bond formation of the chelating aromatic PCP substrate DPPMH (3; DPPMH = 1,3-bis((diphenylphosphino)methylene)mesitylene) has been studied in order to determine the factors which control the complex formation of such ligands. Reacting 3 with (RCN)(2)MCl(2) (R = Me, Ph; M = Pd, Pt) and (COD)PtX(2) (X = Cl, Me; COD = 1,5-cyclooctadiene) resulted in the formation of several 8- and 16-membered mono- and binuclear palladium(II) and platinum(II) macrocycles: trans-[(DPPMH)PdCl(2)](2) (5), trans-[(DPPMH)PtCl(2)](2) (6), cis-(DPPMH)PtCl(2) (7), cis-(DPPMH)PtMe(2) (8), and cis-[(DPPMH)PtMe(2)](2) (9). Compounds 5-9 were fully characterized using NMR, FAB-MS, FD-MS, elemental analysis, and X-ray crystallography. Thermolysis of the bimetallic trans-[(DPPMH)PtCl(2)](2) (6) results in the formation of the monomeric cis-(DPPMH)PtCl(2) (7). The product formation depends on the neutral- (nitriles or COD) and anionic ligands (Cl and CH(3)) of the metal precursor. The molecular structures of trans-[(DPPMH)PdCl(2)](2) (5) and cis-[(DPPMH)PtMe(2)](2) (9) have been determined by complete single-crystal diffraction studies. Crystal data for 5: monoclinic, space group P2(1)/n with a = 14.547(3) Å, b = 17.431(4) Å, c = 27.839 (5) Å, beta = 99.56(2) degrees, V = 6961(3) Å(3), and Z = 4. The structure converged to R = 0.048 and R(w) = 0.049. Crystal data for 9: monoclinic, space group P2(1)/n with a = 19.187(4) Å, b = 19.189(4) Å c = 20.705(2) Å, beta = 103.41(3) degrees, V = 7415(3) Å(3), and Z = 4. The structure refinement converged to R = 0.0977 and R(w) = 0.2212. |
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Authors:
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Milko E. van Der Boom; Michael Gozin; Yehoshoa Ben-David; Linda J. W. Shimon; Felix Frolow; Heinz-Bernard Kraatz; David Milstein |
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Publication Detail:
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Type: JOURNAL ARTICLE |
Journal Detail:
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Title: Inorganic chemistry Volume: 35 ISSN: 1520-510X ISO Abbreviation: Inorg Chem Publication Date: 1996 Nov |
Date Detail:
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Created Date: 2001-Oct-22 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0366543 Medline TA: Inorg Chem Country: - |
Other Details:
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Languages: ENG Pagination: 7068-7073 Citation Subset: - |
Affiliation:
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Departments of Organic Chemistry and Chemical Services, The Weizmann Institute of Science, 76100 Rehovot, Israel. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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