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Marinoni G, Panigatti M, D'Alfonso G, Mercandelli P, Sironi A. Unconventional distribution of hydrides in hydrido rhenium carbonyl clusters. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305087374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Casati N, Macchi P, Sironi A. High pressure study of Co 2(CO) 6(XPh 3) 2(X=As, P) phase transitions via SXRD. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305080578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Bicchi C, Brunelli C, Cordero C, Rubiolo P, Galli M, Sironi A. High-speed gas chromatography with direct resistively-heated column (ultra fast module-GC)-separation measure (S) and other chromatographic parameters under different analysis conditions for samples of different complexities and volatilities. J Chromatogr A 2005; 1071:3-12. [PMID: 15865167 DOI: 10.1016/j.chroma.2004.09.051] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of GC speed on the separation capability of a chromatographic system is reported measuring a series of parameters including separation measure (S), peak capacity (n), peak width (w), analysis time, t(b) (determined on the last eluting compound) and separation measure/analysis time ratio (S/t(b)) determined by analyzing a bergamot essential oil sample and a standard mixture of pesticides. Conventional GC, fast GC (with 10 m (FGC10) and 5 m (FGC5) narrow-bore columns), and direct resistively-heated ultra fast module-GC (UFM-GC) were the GC speed approaches used. The influence of different heating rates with a constant flow for FGC5, FGC 10, and UFM-GC and with variable flows for UFM-GC on S, n, w, S/t(b), and t(b) was also studied. The results of this study show that: (a) separation capability of the chromatographic system (i.e. S and n) and analysis time depend on the GC approaches. Within each GC approach, S and n and analysis time depend on the heating rates, although to a different extent, and S and n decrease much less than the gain in analysis time, in particular when fast heating rates are applied; (b) in UFM-GC, the loss of separation capability with heating rate can also be partially compensated by the choice of an appropriate flow rate that, within each heating rate, may contribute to increase S while reducing t(b); (c) within a specific GC approach, the chromatographic system (column and stationary phase) and conditions (heating and flow rates) must be such to achieve a suitable S-value when two analytes must be separated with a given resolution in a minimum analysis time.
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Genovesi S, Giussani M, Pieruzzi F, Sironi A, Zaccaria D, Tono V, Galbiati S, Cavuto S, Stella A. Effects of Weight Excess and Gender on Blood Pressure Values in a Paediatric Population. High Blood Press Cardiovasc Prev 2005. [DOI: 10.2165/00151642-200512030-00034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
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Bergamo M, Beringhelli T, D'Alfonso G, Maggioni D, Mercandelli P, Sironi A. A ketone complex by alkylation of an acyl anion. Synthesis, crystal structure and spectroscopic characterization of [Cp(CO)2Re{OC(Me)Ph}]. Inorganica Chim Acta 2003. [DOI: 10.1016/s0020-1693(02)01520-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Farrugia LJ, Macchi P, Sironi A. Reversible displacive phase transition in [Ni(en)3]2+(NO3−)2: a potential temperature calibrant for area-detector diffractometers. J Appl Crystallogr 2003. [DOI: 10.1107/s0021889802021878] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The coordination complex [Ni(en)3]2+(NO{}_{3}^{- })2(en = 1,2-diaminoethane) undergoes a sharp reversible displacive phase transition at ∼109 K, changing space group fromP6322 above the transition temperature toP6522 below. The phase change is accompanied by a tripling of thecaxis on cooling, resulting in an easy detection of the transition in images from area-detector diffractometers. The transition has been followed using a Nonius KappaCCD and a Bruker SMART APEX CCD. Data sets were collected over the temperature range 100–113 K and integrated using the low-temperature orientation matrix. Reflections withl≠ 3nshow a smooth and rapid decrease in intensity to zero on warming from 106.5 to 111 K. The results are reproducible to within ±2 K in two laboratories and suggest that this compound may be useful as a liquid-nitrogen cryo-calibrant for diffraction instruments equipped with area detectors.
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Macchi P, Sironi A. Low temperature: a 'non-innocent' must for accurate electron density studies. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302086282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Ciani G, D'Alfonso G, Romiti P, Sironi A, Freni M. Stepwise degradation of the unsaturated cluster tetrakis(.mu.-hydrido)decacarbonyltrirhenate(1-) by reaction with iodine. Crystal and molecular structures of the tetraethylammonium salts of the new anions bis(.mu.-hydrido)bis(.mu.-iodo)decacarbonyltrirhenate(1-) and (.mu.-hydrido)bis(.mu.-iodo)hexacarbonyldirhenate(1-). Inorg Chem 2002. [DOI: 10.1021/ic00163a027] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ciani G, Masciocchi N, Sironi A, Fumagalli A, Martinengo S. Synthesis and structural characterization of the nitrido-carbonyl cluster anion [Co7N(CO)15]2-, possessing a carbonyl stereochemistry different from that of its rhodium analog. Inorg Chem 2002. [DOI: 10.1021/ic00028a041] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Masciocchi N, Moret M, Sironi A, Bruni S, Cariati F, Pozzi A, Manfredini T, Menabue L, Pellacani GC. Structural and spectroscopic correlations in cadmium(II) halide complexes of 2,2-dimethylpropane-1,3-diamine. Inorg Chem 2002. [DOI: 10.1021/ic00034a020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Beringhelli T, D'Alfonso G, Ghidorsi L, Ciani G, Sironi A, Molinari H. New hydrido-carbonyl rhenates by reduction of dirhenium decacarbonyl with bases. X-ray crystal structure of the anion [Re2H2(.mu.-H)(CO)8]-. Organometallics 2002. [DOI: 10.1021/om00149a044] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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Beringhelli T, D'Alfonso G, Ciani G, Proserpio DM, Sironi A. Ortho-metalated pyridine derivatives of the unsaturated rhenium cluster anion [Re3(.mu.-H)4(CO)10]-. Syntheses and x-ray crystal structures of the tetraethylammonium salts of the anions [Re3(.mu.-H)3(.mu.-.eta.2-NC5H4)(CO)10]- and [Re3(.mu.-H)3(.mu.-.eta.2-NC5H4)(CO)9(NC5H5)]-. Organometallics 2002. [DOI: 10.1021/om00036a028] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Masciocchi N, Ardizzoia GA, LaMonica G, Maspero A, Galli S, Sironi A. Metal imidazolato complexes: synthesis, characterization, and X-ray powder diffraction studies of group 10 coordination polymers. Inorg Chem 2001; 40:6983-9. [PMID: 11754280 DOI: 10.1021/ic010585d] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Binary metal imidazolates of the group 10 metals have been prepared and typically found amorphous. However, the intermediacy of a number of (poly)crystalline species during their formation has been evidenced; their selective preparation and characterization, by chemical, spectroscopic, and thermal methods and their structure solution by the ab initio X-ray powder diffraction technique lead to the discovery of new interesting structural features, such as those of polymeric Ni(Him)(2)(im)(CH(3)COO) (Him = imidazole) and of the hydrogen-bonded polymers of general Pd(x)Pt(1-x)(Him)(2)(im)(2) formula (x = 0, 0.5, 1). The latter are built upon 2D frameworks of (pseudo)square meshes, which, in the pure Pd derivative, form an entangled structure based upon interpenetrating 2D layers, coupled in pairs. The different structures are discussed in terms of different conformations of the new "im-H-im" ligand, which acts as monoanionic exobidentate fragment, similar to im, pyrazolate (pz), "pz-H-pz", and pyrimidin-2-olate.
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Balboni D, Camurati I, Prini G, Resconi L, Galli S, Mercandelli P, Sironi A. Group 4 dimethylmetallocenes: improved synthesis and reactivity studies. Inorg Chem 2001; 40:6588-97. [PMID: 11735467 DOI: 10.1021/ic010018q] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Group 4 dimethylmetallocenes are catalyst precursors for the methylmetallocenium/borate catalyst systems for olefin polymerization, and they are usually prepared by methylation (with MeMgCl or MeLi) of the parent metallocene dichlorides. We describe here a simpler preparation of a series of bisindenyldimethylmetallocenes carried out by reacting the pi-ligand with a 2-fold excess of MeLi, and then MtCl(4) (Mt = Ti, Zr, Hf). This simple, one-pot method produces the dimethylated complexes in higher overall yield, and saves on reaction time and solvents. Ind(2)MtMe(2) (1, Mt = Ti; 2a, Mt = Zr; 3, Mt = Hf), (4,7-Me(2)Ind)(2)ZrMe(2) (4), rac/meso-[C(2)H(4)(Ind)(2)]ZrMe(2) (5), meso-[C(2)H(4)(4,7-Me(2)Ind)(2)]ZrMe(2) (m-6a), and meso-[C(2)H(4)(4,7-Me(2)Ind)(2)]HfMe(2) (m-7a) have been prepared in 40-80% isolated yields. 2a reacts with 1-4 equiv of t-BuOH to give the mono-tert-butoxy derivative 2b, Ind(2)ZrMe(O-t-Bu), while reaction with 2 equiv of C(6)F(5)OH cleanly affords Ind(2)Zr(OC(6)F(5))(2) (2c). Analogously, in the presence of 2 equiv of t-BuOH, m-6a gives meso-[C(2)H(4)(4,7-Me(2)Ind)(2)]ZrMe(O-t-Bu) (m-6b) with replacement of the outward methyl group only, as established by NMR analysis; meso-[C(2)H(4)(4,7-Me(2)Ind)(2)]Zr(OC(6)F(5))(2) (m-6c) is obtained by reaction with 2 equiv of C(6)F(5)OH. The molecular structures of m-6a and m-6c are also described.
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Masciocchi N, Bruni S, Cariati E, Cariati F, Galli S, Sironi A. Extended polymorphism in copper(II) imidazolate polymers: a spectroscopic and XRPD structural study. Inorg Chem 2001; 40:5897-905. [PMID: 11681902 DOI: 10.1021/ic010384+] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Copper(II) bisimidazolate affords five different polymorphs; of these, one was structurally characterized 40 years ago by standard single-crystal X-ray diffraction (Jarvis, J. A. J.; Wells, A. F. Acta Crystallogr. 1960, 13, 1027), while the remaining four, selectively prepared as pure polycrystalline phases, have been now studied by X-ray powder diffraction (XRPD) methods. Of the four new (blue, green, olive-green, and pink) phases, three were solved by the ab initio XRPD technique and refined by the Rietveld method, and the fourth phase (pink) could not be structurally characterized. Crystal data for [Cu(imidazolate)(2)](n): blue phase, a = 27.559(3) A, c = 5.3870(9) A, trigonal, R3 macro, Z = 54; green phase, a = 21.139(1) A, b = 19.080(1) A, c = 9.2842(8) A, orthorhombic, Ccca, Z = 20; olive-green phase, a = 11.7556(8) A, b = 23.422(2) A, c = 9.0727(9) A, beta = 104.993(5) degrees, monoclinic, C2/c, Z = 12. All polymorphs contain four-coordinate CuN(4) chromophores and (N,N')-exobidentate imidazolate ligands, but show different spectroscopic and structural properties, the latter ranging from 2D to different 3D networks of the PtS, sodalite, and moganite archetypes. The intermediacy of the [Cu(imidazole)(2)CO(3)]-H(2)O species in the synthesis of the blue polymorph has been confirmed by spectroscopic and thermal analyses. FTIR, Raman, and electronic spectra were correlated with the structural features revealed in the present work, and used to gain insight into the coordination geometry of copper(II) ions of the pink polymorph. In addition, the correct Raman spectrum for copper(II) bisimidazolate, common for all polymorphs, has been definitely determined.
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Masciocchi N, Bruni S, Cariati E, Cariati F, Galli S, Sironi A. Extended polymorphism in copper(II) imidazolate polymers: a spectroscopic and XRPD structural study. Inorg Chem 2001. [PMID: 11681902 DOI: 10.1021/ic010384] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Copper(II) bisimidazolate affords five different polymorphs; of these, one was structurally characterized 40 years ago by standard single-crystal X-ray diffraction (Jarvis, J. A. J.; Wells, A. F. Acta Crystallogr. 1960, 13, 1027), while the remaining four, selectively prepared as pure polycrystalline phases, have been now studied by X-ray powder diffraction (XRPD) methods. Of the four new (blue, green, olive-green, and pink) phases, three were solved by the ab initio XRPD technique and refined by the Rietveld method, and the fourth phase (pink) could not be structurally characterized. Crystal data for [Cu(imidazolate)(2)](n): blue phase, a = 27.559(3) A, c = 5.3870(9) A, trigonal, R3 macro, Z = 54; green phase, a = 21.139(1) A, b = 19.080(1) A, c = 9.2842(8) A, orthorhombic, Ccca, Z = 20; olive-green phase, a = 11.7556(8) A, b = 23.422(2) A, c = 9.0727(9) A, beta = 104.993(5) degrees, monoclinic, C2/c, Z = 12. All polymorphs contain four-coordinate CuN(4) chromophores and (N,N')-exobidentate imidazolate ligands, but show different spectroscopic and structural properties, the latter ranging from 2D to different 3D networks of the PtS, sodalite, and moganite archetypes. The intermediacy of the [Cu(imidazole)(2)CO(3)]-H(2)O species in the synthesis of the blue polymorph has been confirmed by spectroscopic and thermal analyses. FTIR, Raman, and electronic spectra were correlated with the structural features revealed in the present work, and used to gain insight into the coordination geometry of copper(II) ions of the pink polymorph. In addition, the correct Raman spectrum for copper(II) bisimidazolate, common for all polymorphs, has been definitely determined.
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Bicchi C, Brunelli C, Galli M, Sironi A. Conventional inner diameter short capillary columns: an approach to speeding up gas chromatographic analysis of medium complexity samples. J Chromatogr A 2001; 931:129-40. [PMID: 11695515 DOI: 10.1016/s0021-9673(01)01169-4] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Short capillary columns (5 m) with 0.25 mm inner diameter (I.D.) are applied to the GC analysis of medium complexity samples (up to 30 components) with the aim of shortening analysis time. This approach is complementary to fast GC with narrow-bore columns and is based on compensating the lower efficiency of short columns with conventional I.D.'s (0.25-0.32 mm) by using a stationary phase selectivity suitable to separate the components of the sample under investigation, so that the required resolution power is achieved but, at the same time, the analysis time is shortened. The qualitative and quantitative effectiveness of this approach is demonstrated through the analysis of: essential oils with different compositions (chamomile and rosemary), low-volatility triterpenes in a plant extract (Maytenus aquifolium and M. ilicfolium), thermolabile pyrethrins in a Pyrethrum extract, and a mixture of pesticides applied to protect medicinal plant crops. In all examples, GC analysis was five to ten times faster than with conventional columns.
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Ciani G, Sironi A, Martinengo S, Garlaschelli L, Della Pergola R, Zanello P, Laschi F, Masciocchi N. Synthesis and X-ray characterization of the phosphido-carbonyl cluster anions. Inorg Chem 2001; 40:3905-11. [PMID: 11466048 DOI: 10.1021/ic0007355] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The [Co(9)P(CO)(21)](2)(-) anion has been isolated from the products of the reaction between Na[Co(CO)(4)] and PCl(5) in tetrahydrofuran at reflux. The structure of the cluster anion [Co(9)P(CO)(21)](2)(-) in its tetraphenylphosphonium salt has been elucidated by X-ray analysis. The crystals are monoclinic, space group P2(1)/n, a = 12.528(3), b = 14.711(5), c = 19.312(6) A, beta = 93.68(2) degrees, Z = 2. Final R = 0.065 for 2300 unique reflections having I > 3sigma(I). The anion, which is disordered about an inversion center, consists of a monocapped square antiprismatic cluster containing an interstitial phosphide and surrounded by 13 terminal and 8 edge-bridging carbonyl ligands. Average values are: Co-Co 2.685 A, and Co-P 2.256 A. The [Co(10)P(CO)(22)](3)(-) anion has been obtained by condensation of the [Co(9)P(CO)(21)](2)(-) anion with [Co(CO)(4)](-) in tetrahydrofuran at reflux. While the [Co(9)P(CO)(21)](2)(-) anion is stable under CO, the [Co(10)P(CO)(22)](3)(-) anion is decomposed to [Co(9)P(CO)(21)](2)(-) and [Co(CO)(4)](-). The benzyltrimethylammonium salt of the [Co(10)P(CO)(22)](3)(-) anion has been studied by X-ray analysis. It gives triclinic crystals, space group P_1, a = 11.452(3), b = 23.510(6), c = 25.606(4) A, alpha = 112.46(1), beta = 95.79(1), gamma = 73.548(2) degrees, Z = 4. Final R = 0.041 for 8600 unique reflections having I > 3sigma(I). There are two independent trianions in the asymmetric unit, both showing similar geometries, consisting of bicapped square antiprismatic clusters with a central P atom, each bearing 10 terminal and 12 edge-bridging carbonyl ligands, 8 of which, bound to the capping metals, are markedly asymmetric. Average values are: Co-Co 2.678 A, and Co-P 2.262 A. Electrochemistry shows that [Co(9)P(CO)(21)](2)(-) and [Co(10)P(CO)(22)](3)(-) in acetonitrile solution undergo either a one-electron oxidation or a two-electron reduction. This latter process appears as a single step in the case of the dianion and as two separated one-electron steps in the case of the trianion. All the processes are accompanied by slow chemical complications, thus testifying that no stable redox congeners exist for these phosphide clusters.
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Macchi P, Iversen BB, Sironi A, Chakoumakos BC, Larsen FK. Interanionic O-H...O Interactions: the Charge Density Point of View. Acta Crystallogr A 2000. [DOI: 10.1107/s0108767300022996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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Macchi P, Iversen BB, Sironi A, Chakoumakos BC, Larsen FK. Interanionic O-H small middle dot small middle dot small middle dotO Interactions: The Charge Density Point of View The Oak Ridge National Laboratory is managed by Lockheed Martin Energy Research Corporation for the US Department of Energy (DE-AC05-96OR22464). Prof. M. Moret and Dr. L. Carlucci are thanked for help in crystallizing large samples suitable for the neutron study. P.M. gratefully acknowledges DANSYNC center under the Danish Natural Science Research Council for a post-doctoral grant. Angew Chem Int Ed Engl 2000; 39:2719-2722. [PMID: 10934404 DOI: 10.1002/1521-3773(20000804)39:15<2719::aid-anie2719>3.0.co;2-8] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Bergamo M, Beringhelli T, D'Alfonso G, Mercandelli P, Moret M, Sironi A. [Re]. Angew Chem Int Ed Engl 1999; 38:3486-3488. [PMID: 10602216 DOI: 10.1002/(sici)1521-3773(19991203)38:23<3486::aid-anie3486>3.3.co;2-k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
A chair conformation comparable to that observed for six-membered rings composed of tetrahedral carbon atoms is found for the cluster anion [Re(6)(µ-H)(5)(CO)(24)](-) (see picture; black spheres: Re, white spheres: µ-H; CO ligands omitted for clarity) in spite of the octahedral coordination at the Re centers. This is the first example of a carbonyl cluster exhibiting a cyclohexane-like geometry of the metallic framework.
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Macchi P, Garlaschelli L, Martinengo S, Sironi A. Charge Density in Transition Metal Clusters: Supported vs Unsupported Metal−Metal Interactions. J Am Chem Soc 1999. [DOI: 10.1021/ja9918977] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Beringhelli T, D'Alfonso G, Panigati M, Porta F, Mercandelli P, Moret M, Sironi A. A Methyl Group Bridging on Three Metal Atoms. Solid-State and Solution Structural Characterization of the [Re3(μ-H)3(μ3-CH3)(CO)9]- Anion. J Am Chem Soc 1999. [DOI: 10.1021/ja983379m] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Macchi P, Proserpio DM, Sironi A, Soave R, Destro R. A Test of the Suitability of CCD Area Detectors for Accurate Electron-Density Studies. J Appl Crystallogr 1998. [DOI: 10.1107/s0021889898001356] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Beringhelli T, D'Alfonso G, Panigati M, Porta F, Mercandelli P, Moret M, Sironi A. Reactions of Pyrazole with Unsaturated Triangular Clusters of Rhenium. Solid-State and Solution Characterization of an Intramolecular N−H···π Hydrogen Bond. Organometallics 1998. [DOI: 10.1021/om9800849] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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