@article{sharma_kim_cameron_lyndon_gorman_2010, title={Dendritically Encapsulated, Water-Soluble Fe4S4: Synthesis and Electrochemical Properties}, volume={49}, ISSN={["0020-1669"]}, DOI={10.1021/ic1002447}, abstractNote={Amphiphilic, Fe(4)S(4) cluster core dendrimers can be prepared via ligand exchange with dendrons containing carboxylic acid peripheral groups and a thiol focal group. These amphiphilic dendrons are more susceptible to oxidative disulfide formation than their non-amphiphilic analogues reported previously. Thus, an in situ deprotection of an aromatic thioacetate was necessary to prepare the dendrimers. These molecules showed the expected decrease in rate with increasing generation. A slower rate of heterogeneous electron transfer was found when these molecules were compared with non-amphiphilic analogues. This behavior correlated with their larger size and thus a larger effective distance of electron transfer. Voltammetry in DMSO with added water makes the dendrimers easier to reduce, but the change in redox potential is much smaller for all dendrimers when compared to a non-dendritic analogue. This behavior is consistent with the idea that the dendrimers encapsulate the cluster to some degree, creating a hydrophobic microenvironment around the cluster.}, number={11}, journal={INORGANIC CHEMISTRY}, author={Sharma, Anil K. and Kim, Namjin and Cameron, Christopher S. and Lyndon, Matthew and Gorman, Christopher B.}, year={2010}, month={Jun}, pages={5072–5078} } @article{zhao_chen_wang_yang_ghosh_zheng_lyndon_muddiman_stang_2010, title={Facile Self-Assembly of Dendritic Multiferrocenyl Hexagons and Their Electrochemistry}, volume={29}, ISSN={["1520-6041"]}, DOI={10.1021/om1008605}, abstractNote={The design and synthesis of a new class of dendritic multiferrocenyl hexagons have been achieved via [3+3] coordination-driven self-assembly. The relative distribution of dendritic and ferrocenyl subunits on the periphery of supramolecular metallocycles can be precisely controlled. The structures of all compounds are confirmed by multinuclear NMR, ESI-MS/ESI-TOF-MS, and elemental analysis. The electrochemical properties of the newly designed dendritic multiferrocenyl complexes have been studied through cyclic voltammetry investigation.}, number={22}, journal={ORGANOMETALLICS}, author={Zhao, Guang-Zhen and Chen, Li-Jun and Wang, Cui-Hong and Yang, Hai-Bo and Ghosh, Koushik and Zheng, Yao-Rong and Lyndon, Matthew M. and Muddiman, David C. and Stang, Peter J.}, year={2010}, month={Nov}, pages={6137–6140} } @article{xu_yang_zheng_ghosh_lyndon_muddiman_stang_2010, title={Self-Assembly of Dendritic Tris(crown ether) Hexagons and Their Complexation with Dibenzylammonium Cations}, volume={75}, ISSN={["1520-6904"]}, DOI={10.1021/jo101648p}, abstractNote={The construction of a new series of dendritic tris(crown ether) hexagons via coordination-driven self-assembly is described. Combining 120° crown ether-containing diplatinum(II) acceptors with 120° dendritic dipyridyl donors in a 1:1 ratio allows for the formation of a new family of dendritic triple crown ether derivatives with a hexagonal cavity in quantitative yields. The number and the position of these pendant groups can be precisely controlled on the hexagonal metallacycle. The structures of all dendritic multiple crown ether hexgaons are confirmed by multinuclear NMR ((1)H and (31)P), ESI-MS and ESI-TOF-MS, and elemental analysis. The complexation of these dendritic trivalent receptors with dibenzylammonium cations was investigated by (1)H NMR titration experiments. The thermodynamic binding constants between the receptors and guests were established by using the nonlinear least-squares fit method based on (1)H NMR titration experiments. It was found that the association constants of each assembly decrease correspondingly upon the increase of the generation of the dendrons from [G0] to [G3], which might be caused by the steric effect of the dendrons on host-guest complexation.}, number={21}, journal={JOURNAL OF ORGANIC CHEMISTRY}, author={Xu, Xing-Dong and Yang, Hai-Bo and Zheng, Yao-Rong and Ghosh, Koushik and Lyndon, Matthew M. and Muddiman, David C. and Stang, Peter J.}, year={2010}, month={Nov}, pages={7373–7380} } @article{zhao_ghosh_zheng_lyndon_williams_stang_2009, title={Construction of Coordination-Driven Self-Assembled [5+5] Pentagons Using Metal-Carbonyl Dipyridine Ligands}, volume={48}, ISSN={["1520-510X"]}, url={http://europepmc.org/abstract/med/19476323}, DOI={10.1021/ic900649m}, abstractNote={The coordination-driven self-assembly of two metal-carbonyl-cluster-coordinated dipyridyl donors, (4-C(5)H(4)N)(2)C[triple bond]CCo(2)(CO)(6) (1) and (4-C(5)H(4)N)(2)C[triple bond]CMo(2)Cp(2)(CO)(4) (2), with a linear diplatinum(II) acceptor ligand was investigated. The structures of the resulting self-assembled polygons were found to be controlled by the steric bulk of the metal-carbonyl cluster adduct. The use of a sterically less imposing ligand 1 resulted in a pentagon-hexagon mixture, which was characterized by electrospray ionization time-of-flight mass spectroscopy. The exclusive formation of a [5 + 5] pentagon was achieved by the self-assembly of the bulkier molybdenum donor ligand 2 with a linear organoplatinum(II) acceptor ligand. Molecular force field modeling was used to study the structural details of the pentagonal and hexagonal architectures. The first Fe(3)-Co(6)-Pt(6) trimetal [3 + 3] hexagon was also synthesized via the combination of 1 with a 120 degrees ferrocenyldiplatinum(II) acceptor.}, number={13}, journal={INORGANIC CHEMISTRY}, author={Zhao, Liang and Ghosh, Koushik and Zheng, Yaorong and Lyndon, Matthew M. and Williams, Taufika Islam and Stang, Peter J.}, year={2009}, month={Jul}, pages={5590–5592} } @article{yang_northrop_zheng_ghosh_lyndon_muddiman_stang_2009, title={Synthesis of Six-Component Metallodendrimers via [3+3] Coordination-Driven Self-Assembly}, volume={74}, ISSN={["0022-3263"]}, DOI={10.1021/jo900067v}, abstractNote={A new class of 120 degrees dendritic di-Pt(II) acceptor subunits has been designed and synthesized, from which six-component hexagonal metallodendrimers were easily formed with 120 degrees dendritic dipyridine donors via [3 + 3] coordination-driven self-assembly. The structures of all metallodendrimers are confirmed by multinuclear NMR, ESI-TOF-MS/ESI-FTMS, and elemental analysis. MMFF force-field simulations indicates that all metallodendrimers have a hexagonal ring with an internal radius of approximately 1.4 nm.}, number={9}, journal={JOURNAL OF ORGANIC CHEMISTRY}, author={Yang, Hai-Bo and Northrop, Brian H. and Zheng, Yao-Ron and Ghosh, Koushik and Lyndon, Matthew M. and Muddiman, David C. and Stang, Peter J.}, year={2009}, month={May}, pages={3524–3527} } @misc{ghosh_yang_northrop_lyndon_zheng_muddiman_stang_2008, title={Coordination-driven self-assembly of cavity-cored multiple crown ether derivatives and poly[2]pseudorotaxanes}, volume={130}, ISSN={["1520-5126"]}, DOI={10.1021/ja711502t}, abstractNote={The synthesis of a new 120 degree diplatinum(II) acceptor unit and the self-assembly of a series of two-dimensional metallacyclic polypseudorotaxanes that utilize both metal-ligand and crown ether-dialkylammonium noncovalent interactions are described. Judiciously combining complementary diplatinum(II) acceptors with bispyridyl donor building blocks, with an acceptor and/or donor possessing a pendant dibenzo[24]crown-8 (DB24C8) moiety, allows for the formation of three new rhomboidal bis-DB24C8, one new hexagonal tris-DB24C8, and four new hexakis-DB24C8 metallacyclic polygons in quantitative yields. The size and shape of each assembly, as well as the location and stoichiometry of the DB24C8 macrocycle, can be precisely controlled. Each polygon is able to complex two, three, or six dibenzylammonium ions without disrupting the underlying metallacyclic polygons, thus producing eight different poly[2]pseudorotaxanes and demonstrating the utility and scope of this orthogonal self-assembly technique. The assemblies are characterized with one-dimensional multinuclear ((1)H and (31)P) and two-dimensional ((1)H-(1)H COSY and NOESY) NMR spectroscopy as well as mass spectrometry (ESI-MS). Further analysis of the size and shape of each assembly is obtained through molecular force-field simulations. (1)H NMR titration experiments are used to establish thermodynamic binding constants and poly[2]pseudorotaxane/dibenzylammonium stoichiometries. Factors influencing the efficiency of poly[2]pseudorotaxane formation are discussed.}, number={15}, journal={JOURNAL OF THE AMERICAN CHEMICAL SOCIETY}, author={Ghosh, Koushik and Yang, Hai-Bo and Northrop, Brian H. and Lyndon, Matthew M. and Zheng, Yao-Rong and Muddiman, David C. and Stang, Peter J.}, year={2008}, month={Apr}, pages={5320–5334} } @article{bereman_lyndon_dixon_muddiman_2008, title={Mass measurement accuracy comparisons between a double-focusing magnetic sector and a time-of-flight mass analyzer}, volume={22}, ISSN={["0951-4198"]}, DOI={10.1002/rcm.3544}, abstractNote={AbstractWe report a direct comparison of the mass measurement accuracies (MMAs) obtained on different mass spectrometry instrument types; a magnetic sector as the ‘gold standard’ and an electrospray ionization time‐of‐flight (ESI‐TOF) instrument. Sixty samples, obtained from the Department of Chemistry at North Carolina State University, were analyzed on each instrument. Data are presented and compared between the different instruments. The average absolute MMAs achieved for the magnetic sector and Agilent ESI‐TOF mass spectrometers were 3.0 and 1.1 ppm, respectively. Copyright © 2008 John Wiley & Sons, Ltd.}, number={10}, journal={RAPID COMMUNICATIONS IN MASS SPECTROMETRY}, author={Bereman, Michael S. and Lyndon, Matthew M. and Dixon, R. Brent and Muddiman, David C.}, year={2008}, month={May}, pages={1563–1566} }