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Coordination environment variations in multinuclear trigonal bipyramid Co(II) complexes bearing tetradentate sulfonamide N-donors and phenoxazinone synthase activities. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119664] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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2
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Das T, Rajak KK. Experimental and theoretical investigation of a metalloreceptor bearing a [Re(CO)3]+ core incorporating a multifunctional ligand: selective reactivity towards Zn2+ and CN− ions. Dalton Trans 2019; 48:6879-6891. [DOI: 10.1039/c9dt00901a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Novel Re(i) complex containing multifunctional ligand HL shows selective reactivity towards Zn2+ and CN−.
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Affiliation(s)
- Tapashi Das
- Inorganic Chemistry Section
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
| | - Kajal Krishna Rajak
- Inorganic Chemistry Section
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
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3
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Osinski AJ, Morris DL, Herrick RS, Ziegler CJ. Re(CO) 3-Templated Synthesis of α-Amidinoazadi(benzopyrro)methenes. Inorg Chem 2017; 56:14734-14737. [PMID: 29172475 DOI: 10.1021/acs.inorgchem.7b02140] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
α-Amidinoazadi(benzopyrro)methenes were synthesized using the Re(CO)3 unit as a templating agent. The products of these template reactions are six-coordinate rhenium complexes, with a facial arrangement of carbonyls, a noncoordinating anion, and a tridentate α-amidinoazadi(benzopyrro)methene ligand. The tridentate ligand shows the conversion of one diiminoisoindoline sp2 carbon to a sp3 carbon, which has been seen in the "helmet" and bicyclic phthalocyanines. The bidentate diiminoisoindoline fragment tilts out of the plane of coordination. Five examples of α-amidinoazadi(benzopyrro)methenes produced from these reactions using different nitrile solvents, including the nitrile activation of acetonitrile, propionitrile, butyronitrile, cyclohexanecarbonitrile, and benzonitrile.
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Affiliation(s)
- Allen J Osinski
- Department of Chemistry, University of Akron , Akron, Ohio 44325-3601, United States
| | - Daniel L Morris
- Department of Chemistry, University of Akron , Akron, Ohio 44325-3601, United States
| | - Richard S Herrick
- Department of Chemistry, College of the Holy Cross , 1 College Street, Worcester, Massachusetts 01610, United States
| | - Christopher J Ziegler
- Department of Chemistry, University of Akron , Akron, Ohio 44325-3601, United States
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4
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Klenc J, Lipowska M, Abhayawardhana PL, Taylor AT, Marzilli LG. Structure and Properties of fac-[Re(I)(CO)3(NTA)](2-) (NTA(3-) = Trianion of Nitrilotriacetic Acid) and fac-[Re(I)(CO)3(L)](n-) Analogues Useful for Assessing the Excellent Renal Clearance of the fac-[(99m)Tc(I)(CO)3(NTA)](2-) Diagnostic Renal Agent. Inorg Chem 2015; 54:6281-90. [PMID: 26068141 PMCID: PMC4863976 DOI: 10.1021/acs.inorgchem.5b00584] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We previously identified two new agents based on the [(99m)Tc(V)O](3+) core with renal clearances in human volunteers 30% higher than that of the widely used clinical tracer (99m)Tc-MAG3 (MAG3(5-) = penta-anion of mercaptoacetyltriglycine). However, renal agents with even higher clearances are needed. More recently, we changed our focus from the [(99m)Tc(V)O](3+) core to the discovery of superior tracers based on the fac-[(99m)Tc(I)(CO)3](+) core. Compared to (99m)Tc-MAG3, fac-[(99m)Tc(I)(CO)3(NTA)](2-) (NTA(3-) = trianion of nitrilotriacetic acid) holds great promise by virtue of its efficient renal clearance via tubular secretion and the absence of hepatobiliary elimination, even in patients with severely reduced renal function. We report here NMR, molecular (X-ray) structure, and solution data on fac-[Re(I)(CO)3(NTA)](2-) with a -CH2CO2(-) dangling monoanionic chain and on two fac-[Re(I)(CO)3(L)](-) analogues with either a -CH2CONH2 or a -CH2CH2OH dangling neutral chain. In these three fac-[Re(I)(CO)3(L)](n-) complexes, the fac-[Re(I)(CO)3(N(CH2CO2)2)](-) moiety is structurally similar and has similar electronic properties (as assessed by NMR data). In reported and ongoing studies, the two fac-[(99m)Tc(I)(CO)3(L)](-) analogues with these neutral dangling chains were found to have pharmacokinetic properties very similar to those of fac-[(99m)Tc(I)(CO)3(NTA)](2-). Therefore, we reach the unexpected conclusion that in fac-[(99m)Tc(I)(CO)3(L)](n-) agents, renal clearance is affected much more than anticipated by features of the core plus the chelate rings (the [(99m)Tc(I)(CO)3(N(CH2CO2)2)](-) moiety) than by the presence of a negatively charged dangling carboxylate chain.
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Affiliation(s)
- Jeffrey Klenc
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Malgorzata Lipowska
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | | | - Andrew T. Taylor
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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5
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Lewis NA, Marzilli PA, Fronczek FR, Marzilli LG. Models for B12-conjugated radiopharmaceuticals. Cobaloxime binding to new fac-[Re(CO)3(Me2bipyridine)(amidine)]BF4 complexes having an exposed pyridyl nitrogen. Inorg Chem 2014; 53:11096-107. [PMID: 25285912 DOI: 10.1021/ic5016675] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
New mononuclear amidine complexes, fac-[Re(CO)3(Me2bipy)(HNC(CH3)(pyppz))]BF4 [(4,4'-Me2bipy (1), 5,5'-Me2bipy (2), and 6,6'-Me2bipy (3)] (bipy = 2,2'-bipyridine), were synthesized by treating the parent fac-[Re(I)(CO)3(Me2bipy)(CH3CN)]BF4 complex with the C2-symmetrical amine 1-(4-pyridyl)piperazine (pyppzH). The axial amidine ligand has an exposed, highly basic pyridyl nitrogen. The reaction of complexes 1-3 with a B12 model, (py)Co(DH)2Cl (DH = monoanion of dimethylglyoxime), in CH2Cl2 yielded the respective dinuclear complexes, namely, fac-[Re(CO)3(Me2bipy)(μ-(HNC(CH3)(pyppz)))Co(DH)2Cl]BF4 [(4,4'-Me2bipy (4), 5,5'-Me2bipy (5), and 6,6'-Me2bipy (6)]. (1)H NMR spectroscopic analysis of all compounds and single-crystal X-ray crystallographic data for 2, 3, 5, and 6 established that the amidine had only the E configuration in both the solid and solution states and that the pyridyl group is bound to Co in 4-6. Comparison of the NMR spectra of 1-3 with spectra of 4-6 reveals an unusually large "wrong-way" upfield shift for the pyridyl H2/6 signal for 4-6. The wrong-way H2/6 shift of (4-Xpy)Co(DH)2Cl (4-Xpy = 4-substituted pyridine) complexes increased with increasing basicity of the 4-Xpy derivative, a finding attributed to the influence of the magnetic anisotropy of the cobalt center on the shifts of the (1)H NMR signals of the pyridyl protons closest to Co. Our method of employing a coordinate bond for conjugating the fac-[Re(I)(CO)3] core to a vitamin B12 model could be extended to natural B12 derivatives. Because B12 compounds are known to accumulate in cancer cells, such an approach is a very attractive method for the development of (99m)Tc and (186/188)Re radiopharmaceuticals for targeted tumor imaging and therapy.
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Affiliation(s)
- Nerissa A Lewis
- Department of Chemistry, Louisiana State University , Baton Rouge, Louisiana 70803, United States
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6
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Morais M, Raposinho PD, Oliveira MC, Pantoja-Uceda D, Jiménez MA, Santos I, Correia JDG. NMR Structural Analysis of MC1R-Targeted Rhenium(I) Metallopeptides and Biological Evaluation of 99mTc(I) Congeners. Organometallics 2012. [DOI: 10.1021/om300502n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Maurício Morais
- Unidade de Ciências Quı́micas
e Radiofarmacêuticas, ITN, Instituto Superior
Técnico, Universidade Técnica de Lisboa, Estrada Nacional 10, 2686-953, Sacavém, Portugal
| | - Paula D. Raposinho
- Unidade de Ciências Quı́micas
e Radiofarmacêuticas, ITN, Instituto Superior
Técnico, Universidade Técnica de Lisboa, Estrada Nacional 10, 2686-953, Sacavém, Portugal
| | - Maria Cristina Oliveira
- Unidade de Ciências Quı́micas
e Radiofarmacêuticas, ITN, Instituto Superior
Técnico, Universidade Técnica de Lisboa, Estrada Nacional 10, 2686-953, Sacavém, Portugal
| | - David Pantoja-Uceda
- Instituto de Quı́mica Fı́sica Rocasolano, Consejo Superior de Investigaciones Científicas (CSIC), Serrano 119, 28006 Madrid, Spain
| | - Maria Angeles Jiménez
- Instituto de Quı́mica Fı́sica Rocasolano, Consejo Superior de Investigaciones Científicas (CSIC), Serrano 119, 28006 Madrid, Spain
| | - Isabel Santos
- Unidade de Ciências Quı́micas
e Radiofarmacêuticas, ITN, Instituto Superior
Técnico, Universidade Técnica de Lisboa, Estrada Nacional 10, 2686-953, Sacavém, Portugal
| | - João D. G. Correia
- Unidade de Ciências Quı́micas
e Radiofarmacêuticas, ITN, Instituto Superior
Técnico, Universidade Técnica de Lisboa, Estrada Nacional 10, 2686-953, Sacavém, Portugal
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7
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Perera T, Abhayawardhana P, Fronczek FR, Marzilli PA, Marzilli LG. Iminoether Complexes of the Type,
fac
‐[Re(CO)
3
L{HNC(CH
3
)OCH
3
}]BF
4
(L = Bipyridine or a Substituted Bipyridine): Synthesis and Properties. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201100768] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Theshini Perera
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Fax: +1‐225‐578‐3463
| | - Pramuditha Abhayawardhana
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Fax: +1‐225‐578‐3463
| | - Frank R. Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Fax: +1‐225‐578‐3463
| | - Patricia A. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Fax: +1‐225‐578‐3463
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Fax: +1‐225‐578‐3463
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8
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Liu X, Chen W. Synthesis of ruthenium(ii) complexes of tetradentate bis(N-pyridylimidazolylidenyl)methane and their reactivities towards N- donors. Dalton Trans 2012; 41:599-608. [DOI: 10.1039/c1dt11356a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Simpson EJ, Hickey JL, Breadner D, Luyt LG. Investigation of isomer formation upon coordination of bifunctional histidine analogues with 99mTc/Re(CO)3. Dalton Trans 2012; 41:2950-8. [PMID: 22266949 DOI: 10.1039/c2dt11962e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Michelin RA, Sgarbossa P, Sbovata SM, Gandin V, Marzano C, Bertani R. Chemistry and biological activity of platinum amidine complexes. ChemMedChem 2011; 6:1172-83. [PMID: 21630470 DOI: 10.1002/cmdc.201100150] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Revised: 04/26/2011] [Indexed: 01/06/2023]
Abstract
Platinum amidine complexes represent a new class of potential antitumor drugs that contain the imino moiety HN=C(sp(2)) bonded to the platinum center. They can be related to the iminoether derivatives, which were recently shown to be the first Pt(II) compounds with a trans configuration endowed with anticancer activity. The chemical and biological properties of platinum amidine complexes, and more generally of platinum imino derivatives, can be rationally modified through suitable synthetic procedures with the aim of improving their cytotoxicity and antitumor activity. The addition of protic nucleophiles to nitriles coordinated to platinum in various oxidation states can offer a wide variety of complexes with chemical, structural, and physical properties specifically tuned for a more efficacious biological response.
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Affiliation(s)
- Rino A Michelin
- Department of Chemical Processes of Engineering, Padova University, Via F. Marzolo 9, 35131 Padova, Italy
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11
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Kannan R, Pillarsetty N, Gali H, Hoffman TJ, Barnes CL, Jurisson SS, Smith CJ, Volkert WA. Design and synthesis of a bombesin peptide-conjugated tripodal phosphino dithioether ligand topology for the stabilization of the fac-[M(CO)3]+ core (M=(99 m)Tc or Re). Inorg Chem 2011; 50:6210-9. [PMID: 21591746 DOI: 10.1021/ic200491z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A new tumor-seeking tridentate topology consisting of a phosphino dithioether ((HOCH(2))(2)PCH(2)CH(2)S(CH(2))(n)CH(2)SR; PS(2)) ligand framework for the production of kinetically inert and in vivo stable facial [(99m)Tc(CO)(3)(PS(2))](+) or [Re(CO)(3)(PS(2))](+) is described. The X-ray crystal structure of fac-Re(CO)(3)(PS(2))PF(6) is reported. The bioconjugation strategies for incorporating bombesin (BBN) peptides on to the PS(2) tripodal framework and, thereby, de novo designing of GRP receptor-seeking Tc(PS(2)-BBN)(CO)(3) are developed.
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Affiliation(s)
- Raghuraman Kannan
- Department of Radiology, University of Missouri, Columbia, Missouri 65211, USA.
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12
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Perera T, Fronczek FR, Marzilli PA, Marzilli LG. Superbasic amidine monodentate ligands in fac-[Re(CO)3(5,5'-Me2bipy)(amidine)]BF4 complexes: dependence of amidine configuration on the remote nitrogen substituents. Inorg Chem 2010; 49:7035-45. [PMID: 20593850 DOI: 10.1021/ic100714m] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Addition of various RNH(2) to fac-[Re(CO)(3)(5,5'-Me(2)bipy)(CH(3)CN)]BF(4) (1) converts the acetonitrile ligand to the amidine ligand (a superbase) in fac-[Re(CO)(3)(5,5'-Me(2)bipy)(HNC(CH(3))NHR)]BF(4) products. Each complex has four conceivable isomers (E, E', Z, and Z') because the amidine CN bonds have double-bond character, and the two remote NHR group substituents are different. The reaction of 1 in acetonitrile is complete in 6 to 96 h (25 degrees C) and forms fac-[Re(CO)(3)(5,5'-Me(2)bipy)(HNC(CH(3))NHR)]BF(4) E' and Z isomers. Only the E' isomer formed crystals (R = methyl, isopropyl, isobutyl, tert-butyl, and benzyl). Upon dissolution of such crystals in acetonitrile-d(3), NMR spectra with highly dominant E' signals gradually changed (approximately 15 min at room temperature) to spectra with signals for an equilibrium mixture of E' and Z isomers. Such slow E'-to-Z isomer interchange is also indicated by 2D ROESY NMR data used primarily to assign solution structure. Equilibrium ratios (E':Z) of approximately 65:35 for R = methyl, isopropyl, and isobutyl and 83:17 for R = tert-butyl demonstrate that increasing the remote NHR group steric bulk above a threshold size favors the E' isomer. Consistent with this trend, fac-[Re(CO)(3)(5,5'-Me(2)bipy)(HNC(CH(3))NH(2))]BF(4), with a remote NH(2) (low bulk) group, favors the Z isomer. In contrast, although the remote NH(benzyl) group in fac-[Re(CO)(3)(5,5'-Me(2)bipy)(HNC(CH(3))NH(CH(2)C(6)H(5))]BF(4) has only moderate bulk, the E' isomer has high abundance as a result of favorable 5,5'-Me(2)bipy/benzyl stacking, evidence for which is present in both solid and solution states. The fac-[Re(CO)(3)(5,5'-Me(2)bipy)(HNC(CH(3))NHR)]BF(4) E isomer can be detected in solvents of low polarity. However, the Z' isomer was not observed, undoubtedly because unfavorable remote-group clashes with the equatorial ligands destabilize this isomer. Challenge studies with a 5-fold excess of 4-dimethylaminopyridine in acetonitrile-d(3) establish that fac-[Re(CO)(3)(5,5'-Me(2)bipy)(HNC(CH(3))NHCH(CH(3))(2))]BF(4) is robust because the isopropylamidine ligand was not displaced, consistent with the superbase character of amidine ligands.
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Affiliation(s)
- Theshini Perera
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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13
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Perera T, Marzilli PA, Fronczek FR, Marzilli LG. NH NMR shifts of new structurally characterized fac-[Re(CO)3(polyamine)]n+ complexes probed via outer-sphere hydrogen-bonding interactions to anions, including the paramagnetic [Re(IV)Br6]2- anion. Inorg Chem 2010; 49:5560-72. [PMID: 20481637 PMCID: PMC2910926 DOI: 10.1021/ic100386c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
fac-[Re(I)(CO)(3)L](n) complexes serve as models for short-lived fac-[(99m)Tc(I)(CO)(3)L](n) imaging tracers (L = tridentate ligands forming two five-membered chelate rings defining the L face). Dangling groups on L, needed to achieve desirable biodistribution, complicate the NMR spectra, which are not readily understood. Using less complicated L, we found that NH groups (exo-NH) projecting toward the L face sometimes showed an upfield shift attributable to steric shielding of the exo-NH group from the solvent by the chelate rings. Our goal is to advance our ability to relate these spectral features to structure and solution properties. To investigate whether exo-NH groups in six-membered rings exhibit the same effect and whether the presence of dangling groups alters the effect, we prepared new fac-[Re(CO)(3)L](n+) complexes that allow direct comparisons of exo-NH shifts for six-membered versus five-membered chelate rings. New complexes were structurally characterized with the following L: dipn [N-3-(aminopropyl)-1,3-propanediamine], N'-Medipn (3,3'-diamino-N-methyldipropylamine), N,N-Me(2)dipn (N,N-dimethyldipropylenetriamine), aepn [N-2-(aminoethyl)-1,3-propanediamine], trpn [tris-(3-aminopropyl)amine], and tren [tris-(2-aminoethyl)amine]. In DMSO-d(6), the upfield exo-NH signals were exhibited by all complexes, indicating that the rings sterically shield the exo-NH groups from bulky solvent molecules. This interpretation was supported by exo-NH signal shift changes caused by added halide and [ReBr(6)](2-) anions, consistent with outer-sphere hydrogen-bond interactions between these anions and the exo-NH groups. For fac-[Re(CO)(3)(dipn)]PF(6) in acetonitrile-d(3), the exo-NH signal shifted further downfield in the series, Cl(-) > Br(-) > I(-), and the plateau in the shift change required a lower concentration for smaller anions. These results are consistent with steric shielding of the exo-NH groups by the chelate rings. Nevertheless, despite its size, the shape and charge of [ReBr(6)](2-) allowed the dianion to induce large upfield paramagnetic shifts of the exo-NH signal of fac-[Re(CO)(3)(dipn)]PF(6). This dianion shows promise as an outer-sphere hydrogen-bonding paramagnetic shift reagent.
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Affiliation(s)
- Theshini Perera
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Patricia A. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Frank R. Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
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14
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Bokach NA, Konovalova NP, Wang Y, Moskalenko YE, Gribanov AV, Kukushkin VY. One-end nucleophilic addition of di- and triamines to PtIV-coordinated nitriles as an entry to (amidine)PtIV complexes bearing pendant NH2-groups. Dalton Trans 2010; 39:4619-23. [DOI: 10.1039/c001103g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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