@article{cheng_bereman_de grave_bowen_2001, title={A study of aluminum-substituted iron dextran complexes by Mossbauer spectroscopy and X-ray diffraction}, volume={13}, ISSN={["0897-4756"]}, DOI={10.1021/cm000489v}, abstractNote={Two aluminum-substituted iron dextran complexes and one nonsubstituted have been synthesized and characterized by Mossbauer spectroscopy over a wide temperature range (10−298 K) and by X-ray powder diffraction at room temperature. The mean coherence lengths in the directions perpendicular to (211) and (200) are different, indicating that the core iron oxide materials are oblong in shape. The X-ray diffraction patterns of all complexes are very similar, with broad, weak peaks at 5.0, 3.3, 2.5, 2.25, 1.6, and 1.8 A. These values are consistent with cell-contracted akaganeite, β-FeOOH. The three samples exhibit different temperatures for the onset of magnetic splitting in their Mossbauer spectra. The Mossbauer spectra obtained at room temperature can be adequately fitted with a model-independent distribution of quadrupole doublets, while at low temperatures a superposition of distributions of sextets and doublets is required. The obtained Mossbauer parameters are in line with the structural features. This is...}, number={1}, journal={CHEMISTRY OF MATERIALS}, author={Cheng, TR and Bereman, R and De Grave, E and Bowen, LH}, year={2001}, month={Jan}, pages={136–140} }
 @article{hough_haney_bereman_keefer_2000, title={An examination of the coordination chemistry of L2Pt(1,2-dithiolenes) using atmospheric pressure chemical ionization mass spectrometry}, volume={51}, ISSN={["0095-8972"]}, DOI={10.1080/00958970008047077}, abstractNote={Abstract Atmospheric pressure chemical ionization mass spectrometry (APCI–MS) has been utilized in the characterization of two series of platinum dithiolene complexes, (COD)Pt(dt) 1, (COD)–Pt(edt) 2, (COD)Pt(dmid) 3, (COD)Pt(mnt) 4, (COD)Pt(eddo) 5, (COD)Pt(dddt) 6 and (Ph3P)2Pt(dt) 7, (Ph3P)2Pt(edt) 8, (Ph3P)2Pt(dmid) 9, (Ph3P)2Pt(dmit) 10, (Ph3P)2Pt(mnt) 11 (where COD = 1,5–cyclooctadiene, dt = ethane–1,2–dithiolate, edt = ethylene–1,2–dithiolate, dmid = 1,3–dithiole–2–oxo–4,5–dithiolate, dmit = 1,3–dithiole–2–thione–4,5–dithiolate, mnt = maleonitrile–1,2–dithiolate, eddo = 4–(ethylene–1′,2′–dithiolate)–1,3-dithiole–2–one, and dddt = 5,6–dihydro–1,4–dithiin–2,3–dithiolate). The series that contains triphenylphosphine is labile toward the loss of HPPh3 +. In addition, an orthometallated species involving the platinum and triphenylphosphine is identified. A dimer is identified for 2, which is shown to be a product of the experiment and not present in the parent material. In addition, a 1:1 adduct with NH4 + is identified for 4 and 11 where the NH4 + originates from the acid hydrolysis of acetonitrile. Finally, a highly unique ion, Pt+, a bare platinum ion, is observed in all COD complexes indicating that a radical mechanism must accompany the decomposition of the COD complexes during the fragmentation process.}, number={1}, journal={JOURNAL OF COORDINATION CHEMISTRY}, author={Hough, JM and Haney, CA and Bereman, RD and Keefer, CE}, year={2000}, pages={45–54} }
 @article{hough_haney_voyksner_bereman_2000, title={Evaluation of electrospray transport CID for the generation of searchable libraries}, volume={72}, ISSN={["0003-2700"]}, DOI={10.1021/ac991050t}, abstractNote={This paper reports the preliminary investigation of performance-based standard conditions that have been developed for electrospray ionization mass spectrometry. Using performance-based standard criteria, reproducible spectra can be obtained by CID in the electrospray-transport region and searched using a database created using the same performance criteria. To generate library-searchable mass spectra, the instrument was tuned to standard conditions that correspond to low, mid, and high fragmentation energies. The instrument was tuned using ion ratios relative to a given peak in a tune compound for each energy level. The library was evaluated using a set of 22 benzodiazepines. The CID libraries were found to be reproducible, both on the same instrument and on different instruments of the same type. Also, the libraries were found to be independent of flow rate and solvent system. The library was expanded to include 16 sulfonylurea herbicides and tested using spiked water samples. Performance of the library was tested over a concentration range of 2 orders of magnitude using sulfonylurea standards.}, number={10}, journal={ANALYTICAL CHEMISTRY}, author={Hough, JM and Haney, CA and Voyksner, RD and Bereman, RD}, year={2000}, month={May}, pages={2265–2270} }
 @article{knight_bowen_bereman_huang_de grave_1999, title={Comparison of the core size distribution in iron dextran complexes using Mossbauer spectroscopy and X-ray diffraction}, volume={73}, ISSN={["0162-0134"]}, DOI={10.1016/S0162-0134(99)00020-3}, abstractNote={Mössbauer spectra of a series of iron dextran complexes in the intermediate temperature range where both sextet and doublet coexist may be used to obtain a qualitative description of the distribution of core sizes in these samples. Eight samples from five suppliers have been examined at 100 and 77 K. These differ markedly in the relative doublet contribution to the total spectral area and also in the hyperfine fields characterizing the sextets. The results indicate three distinct types of distribution. One sample from each type has also been examined at 4 K, where the doublet component has vanished and the hyperfine field distribution has become narrow and symmetric. These data are compared with estimates of average core diameters from X-ray line broadening.}, number={4}, journal={JOURNAL OF INORGANIC BIOCHEMISTRY}, author={Knight, B and Bowen, LH and Bereman, RD and Huang, SY and De Grave, E}, year={1999}, month={Apr}, pages={227–233} }
 @article{howe_cizmas_bereman_1999, title={Eutrophication of Lake Wingra: A chemistry-based environmental science module}, volume={76}, ISSN={["0021-9584"]}, DOI={10.1021/ed076p924}, abstractNote={The paper describes the development and field test of a curriculum module for introductory chemistry by an interinstitutional, interdisciplinary team representing the disciplines of chemistry, biology, political science, environmental management and computer visualization. The module was designed to show that a serious and common worldwide environmental problem, the eutrophication of freshwater lakes, is directly related to the chemical reactions of phosphates. The module, which includes a student manual, an instructor's manual, and a computer visualization component, is based on a case study of Lake Wingra in Madison, Wisconsin. The module was field tested at two sites, after which 80% of students gave it a high overall rating. Attitude questionnaires administered before and after the unit was taught showed that students increased their interest in environmental problems, increased their understanding of the complexity of the problems, and had a higher level of personal commitment to address environmenta...}, number={7}, journal={JOURNAL OF CHEMICAL EDUCATION}, author={Howe, AC and Cizmas, L and Bereman, R}, year={1999}, month={Jul}, pages={924–926} }
 @article{keefer_bereman_purrington_knight_boyle_1999, title={The Pt-195 NMR of L2Pt(1,2-dithiolene) complexes}, volume={38}, ISSN={["0020-1669"]}, DOI={10.1021/ic980369d}, abstractNote={The syntheses and characterizations of the novel platinum(II) mono-1,2-dithiolenes (COD)Pt(dddt) (1), (Ph3P)2Pt(dddt) (2), (COD)Pt(edt) (3), (Ph3P)2Pt(edt) (4), (bipy)Pt(edt) (5), and (Ph3P)(CO)Pt(dddt) (6) (COD = 1,5-cyclooctadiene; dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate; edt = ethylene-1,2-dithiolate, bipy = 2,2‘-bipyridyl) are reported. 195Pt NMR spectral analysis was performed on the above-mentioned compounds along with the previously reported compounds (COD)Pt(dmid) (7), (Ph3P)2Pt(dmid) (8), (Ph3P)2Pt(dmit) (9), (COD)Pt(mnt) (10), (Ph3P)2Pt(mnt) (11), (COD)Pt(dt) (12), and (Ph3P)2Pt(dt) (13) (dmid = 1,3-dithiole-2-oxo-4,5-dithiolate; dmit = 1,3-dithiole-2-thione-4,5-dithiolate; mnt = maleonitrile-1,2-dithiolate; dt = ethane-1,2-dithiolate). 195Pt NMR results show that, depending on the nature of L2 in L2Pt(1,2-dithiolene) complexes, the 1,2-dithiolene ligands behave as either π donors or acceptors toward the Pt metal center. 195Pt NMR is also sensitive to the relative electron-withdrawing abil...}, number={10}, journal={INORGANIC CHEMISTRY}, author={Keefer, CE and Bereman, RD and Purrington, ST and Knight, BW and Boyle, PD}, year={1999}, month={May}, pages={2294–2302} }
 @article{keefer_purrington_bereman_boyle_1999, title={The first systematic synthesis of heterobimetallic dithiolene-bridged complexes. Synthesis and characterization of metal complexes of 4-(1 ',2 '-ethylenedithiolate)-1,3-dithiole-2-one and dimeric metal complexes of 1,2,3,4-butadienetetrathiolate}, volume={38}, ISSN={["0020-1669"]}, DOI={10.1021/ic990841a}, abstractNote={The 1,2-dithiolene ligands 4-(1‘,2‘-ethylenedithiolate)-1,3-dithiole-2-one (eddo2-) and 1,2,3,4-butadienetetrathiolate (bdt4-) are synthesized by the controlled single or double 1,3-dithiole-2-one ring opening of 4,4‘-bis(1,3-dithiole-2-one) (bdo) (1). The synthesis and characterization of the novel transition metal complexes (COD)Pt(eddo) (2), (diphos)Ni(eddo) (3), [Bu4N][Ni(eddo)2] (4), (COD)Pt(bdt)Pt(COD) (5), and (diphos)Ni(bdt)Pt(COD) (6) (where COD = 1,5-cyclooctadiene, diphos = 1,2-bis(diphenylphosphino)ethane) are reported. Use of eddo2- and bdt4- results in the selective systematic synthesis of transition metal monomers and dimers. In addition, the synthesis of mixed metal dimeric complexes utilizing a “transition metal 1,2-dithiolene” ligand is demonstrated. The single-crystal X-ray structural analyses of the cocrystallized (COD)Pt(eddo)·1/2bdo, monoclinic, P21/n, a = 13.0388(4) A, b = 9.2048(3) A, c = 16.2384(5) A, β = 97.289(5)°, Z = 4, and [Bu4N][Ni(eddo)2], monoclinic, P21/n, a = 8.3508(2) A...}, number={23}, journal={INORGANIC CHEMISTRY}, author={Keefer, CE and Purrington, ST and Bereman, RD and Boyle, PD}, year={1999}, month={Nov}, pages={5437–5442} }
 @article{lee_choi_suh_bereman_1998, title={(-)-sparteine copper(II) dinitrite}, volume={54}, ISSN={["0108-2701"]}, DOI={10.1107/S0108270198005617}, abstractNote={The title complex, [Cu(NO2)2(C15H26N2)], has been prepared and its crystal structure determined. The chiral nitrogen-chelating alkaloid (−)-sparteine acts as a bidentate ligand, reacting with one CuII ion in ethanol to form the title complex, with two nitrite groups occupying the remaining coordination sites, to produce a distorted five-coordinate square-pyramidal structure. One nitrite is bound through one O atom and the other nitrite acts as a η2-chelating group.}, journal={ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS}, author={Lee, YM and Choi, SN and Suh, IH and Bereman, RD}, year={1998}, month={Nov}, pages={1582–1584} }
 @article{keefer_purrington_bereman_1998, title={On the reported existence of ethylenetetrathiolate (C2S44-):The synthesis and characterization of 4,5-bis(acetylthio)-1,3-dithiol-2-one}, number={12}, journal={Synthesis (Stuttgart)}, author={Keefer, C. E. and Purrington, S. T. and Bereman, R. D.}, year={1998}, pages={1710–1712} }
 @article{keefer_purrington_bereman_knight_bedgood_boyle_1998, title={The synthesis and characterization of platinum monodithiolene complexes containing 1,3-dithiole-2-oxo-4,5-dithiolate (dmid(2-)) and 1,3-dithiole-2-thione-4,5-dithiolate (dmit(2-))}, volume={282}, ISSN={["0020-1693"]}, DOI={10.1016/S0020-1693(98)00244-8}, abstractNote={The platinum monodithiolene complexes (COD)Pt(dmid) (1), (COD)Pt(dmit) (2), (Ph3P)2Pt(dmid) (3) and (Ph3P)2Pt(dmit) (4) (where COD = 1.5-cyclooctadiene, dmid = 1,3-dithiole-2-oxo-4,5-dithiolate, dmit = 1,3-dithiole-2-thione-4,5-dithiolate) have been synthesized and characterized. We report here their 1H NMR, 195Pt NMR, UV-Vis spectra and electrochemistry. The X-ray crystal structures are also reported. 2: orthorhombic, Cmcm, a = 10.8535(6), b = 16.8503(7), c = 7.3622(3)Å, Z = 4, 3: triclinic, P1¯, a = 11.2051(4), b = 11.4409(5), c = 15.2212(9)Å, α = 71.882(4), β = 73.125(4), γ = 84.589(6)°, Z = 2. 4·CHCl3: triclinic, P1¯, a = 10.2521(5), b = 13.9387(14), c = 15.6884(18)Å, α = 67.154(9), β = 89.380(15), γ = 83.570(13)°, Z = 2. The crystal structure of 2 exhibits a molecular stacking pattern which has alternating Pt and S(thione) atoms forming a one-dimensional chain which suggests the presence of a weak axial interaction between the Pt and S(thione). A correlation exists between the 195Pt NMR chemical shifts and the one-electron oxidation potentials of these complexes. In addition, it is shown that the carbonyl of the dmid2− ligand is not susceptible to alkoxide attack when coordinated to platinum.}, number={2}, journal={INORGANICA CHIMICA ACTA}, author={Keefer, CE and Purrington, ST and Bereman, RD and Knight, BW and Bedgood, DR and Boyle, PD}, year={1998}, month={Nov}, pages={200–208} }
 @article{baird_maehlmann_bereman_singh_1997, title={Complexes of the 1,3-bis(2-arylimino)benz(f) isoindoline ligand including the crystal structure of the Cu(II) acetate complex}, volume={42}, ISSN={["1029-0389"]}, DOI={10.1080/00958979708045284}, abstractNote={Abstract The new BA1I ligand l,3-bis(2-pyridylimino)benz(f) isoindoline, NBAII, has been synthesized and Zn(II), Ni(II) and Cu(II) complexes with the formula (NBAII)MX (where X = OAc− for Cu(II) and Ni(II) and X = Cl− for Pd(II)) have been prepared. The ligand and complexes have been characterized by 1H-NMR spectroscopy, infrared spectroscopy and electronic absorption spectroscopy. The NBAII ligand can accommodate both planar and distorted tetrahedral geometries in these cases. The quadruply-bonded complex (NBAII)Mo2(OAc)3 has also been prepared. It was found to exhibit an unusual bonding mode for the NBAII ligand. The molecular structure of the Cu(II) compound was determined by single crystal x-ray diffraction techniques: (NBAII)Cu(OAc) crystallizes in the centrosymmetric space group C2/m with a = 20.256(4) A, b = 16.166(3) A, c = 7.915(2) A, α = 90°, β = 94.83(2) °, γ = 90°, V = 2583(1) A and Z = 4. The structure of this complex is compared to that of (B AII)Cu(OAc) which has been used as a model for th...}, number={1-2}, journal={JOURNAL OF COORDINATION CHEMISTRY}, author={Baird, DM and Maehlmann, WP and Bereman, RD and Singh, P}, year={1997}, pages={107–126} }