Aufbruch in die nächste Dimension: nanometergroße, mehrkernige Koordinationsverbindungen mitC3-symmetrischen Liganden

Albrecht, Markus

doi:10.1002/(sici)1521-3757(19991203)111:23<3671::aid-ange3671>3.0.co;2-4

Cited by 18 publications

(1 citation statement)

References 30 publications

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“…A similar strategy is realized in supramolecular coordination chemistry where the thermodynamically reversible coordination of transition metal building blocks to symmetrically substituted donor ligands is used to build up oligonuclear aggregates of nanometer dimension 5. M. Albrecht recently highlighted the supramolecular chemistry of C 3 ‐symmetric ligands leading to C 3 ‐symmetric structures 6…”

Section: Introductionmentioning

confidence: 99%

P309: Fetal echocardiography results in twins at the referral center

Respondek‐Liberska

Grzesiak

Jakubowski

2003

Ultrasound Obstet Gynecol

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Objective: Retrospective analysis of the spectrum of fetal aortic valve stenosis with completed neonatal follow-up. Methods: Fetal echocardiograms of 12 fetuses with aortic stenosis (AS) were analyzed. Mean gestational age at the time of diagnosis was 29.6 weeks. Results: In all 12 cases critical AS has been detected. The left ventricle was estimated as a small in three cases, in 7 cases as enlarged and hypokinetic LV (SF < 28%) and in the next two cases the LV was well formed. In 6 AS cases endocardial fibroelastosis has been detected. Six fetuses presented mitral valve insufficiency, in three cases with small LV mitral valve stenosis was diagnosed. Cardiomegaly occured in 7 cases, including 5 cases with HA/CA > 0.5. Hypoplastic aorta has been detected in 2 cases and in one coartaction of the aorta. Retrograde flow in aortic arch and poor left ventricular function was diagnozed in ten cases. In 2 fetuses extracardiac malformations were present: hydrocephalus and pylorostenosis. In 83% of the cases CS had been performed and 17% were delivered vaginally (2 demises in utero). Four neonates had been qualified to percutaneous balloon valvuloplasty, in three cardiac surgery had been performed. Three neonates with AS (25%) survived -two after valvuloplasty (one of them required also cardiac surgery) and one after Norwood procedure. Conclusions: 1. Poor prognostic factors for neonates with critical fetal SA were as follow: small LV, retrograde flow in aortic arch, hypoplastic asceding aorta, coartaction of the aorta and poor left ventricular function and presence of extracardiac anomalies. 2. Neonates who survived fetal SA had large left ventricle (also with endocardial fibroelastosis) or almost normal growth of LV. P309Fetal echocardiography results in twins at the referral center M. Respondek-Liberska, M. Grzesiak and K. Janiak Research Institute Polish Mother's Memorial Hosp., PolandAim: The aim of the study was a retrospective analysis of fetal echo in twins. Material: 81 pregnancies with 162 fetuses and completed followup. Mean age of pregnant women was 29.1 years, mean fetal age at the time of targeted fetal echocardiography was 25 wks, mean neonatal birth weight was 1754, Apgar 6. There were 43 deaths (43/162 = 26.5%), including 17 in utero and in 26 after delivery. Results: In 162 twin fetuses, the abnormal fetal echocardiography findings were present in 51 fetuses (31.5%). There were: 22 fetuses with TTTS (43.1%), 6 conjoined twins (11.8%), 4 pregnancies with acardiac twin (8 ''twins'') (15.6%), 6 fetuses with CHD (11.8%) and 9 fetuses (17.7%) with arrhythmias. In 22 fetuses with TTTS the most common anomaly was fetal cardiomegaly (11/22) and tricuspid valve regurgitation -TR (11/22). All conjoined twins had common hearts with different anatomy. The most common anomaly in ''normal'' twin with acardiac cotwin was cardiomegaly and TR. There were 6 fetuses (6/51-17.7%) with CHD: 3 × VSD, 1 × HLHS, 1 × AV Canal and 1 × Truncus arteriosus. There were 9 fetuses (9/51-17.7%) with arrhythmias, including 8 fetuses with...

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Section: Introductionmentioning

confidence: 99%

P309: Fetal echocardiography results in twins at the referral center

Respondek‐Liberska

Grzesiak

Jakubowski

2003

Ultrasound Obstet Gynecol

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Complex Formation of NiII, CuII, PdII, and CoIII with 1,2,3,4-Tetraaminobutane

et al. 2001

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Complex formation of the two tetraamine ligands (2S,3S)-1,2,3,4-tetraaminobutane (threo-tetraaminobutane, ttab) and (2R,3S)-1,2,3,4-tetraaminobutane (erythro-tetraaminobutane, etab) with Co(III), Ni(II), Cu(II), and Pd(II) was investigated in aqueous solution and in the solid state. For Ni(II) and Cu(II), the pH-dependent formation of a variety of species [Mn(II)xLyHz](2x+z)+ was established by potentiometric titrations and UV/Vis spectroscopy. In sufficiently acidic solutions the divalent cations formed a mononuclear complex with the doubly protonated ligand of composition [M(H2L)]4+. An example of such a complex was characterized in the crystal structure of [Pd(H2ttab)Cl2]Cl2.H2O. If the metal cation was present in excess, increase of pH resulted in the formation of dinuclear complexes [M2L]4+. Such a species was found in the crystal structure of [Cu2(ttab)Br4].H2O. Excess ligand, on the other hand, lead to the formation of a series of mononuclear bis-complexes [Mq(HxL)(HyL)](q+x+y)+. The crystal structure of [Co(Hetab)2][ZnCl4]2Cl. H2O with the inert, trivalent Co(III) center served as a model to illustrate the structural features of this class of complexes. By using an approximately equimolar ratio of the ligand and the metal cation, a variety of polymeric aggregates both in dilute aqueous solution and in the solid state were observed. The crystal structure of Cu2(ttab)3Br4, which exhibits a two-dimensional, infinite network, and that of [Ni8(ttab)12]Br16.17.5H2O, which contains discrete chiral [Ni8(ttab)12]16+ cubes with approximate T symmetry, are representative examples of such polymers. The energy of different diastereomeric forms of such complexes with the two tetraamine ligands were analyzed by means of molecular mechanics calculations, and the implications of these calculations for the different structures are discussed.

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Classification of Coordination Polygons and Polyhedra According to Their Mode of Self‐Assembly

Swiegers

Malefetse

2001

Chemistry A European J

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This work extends techniques for the controlled formation of synthetic molecular containers by metal-mediated self-assembly. A new classification system based on the self-assembly of such species is proposed. The system: 1) allows a systematic identification of suitable acceptor-donor combinations, 2) widens the variety of design possibilities available, 3) allows a ready comparison of the self-assembly of different compounds, 4) reveals useful commonalities between different compounds, 5) aids in the development of novel architectures, and 6) permits identification of systems capable of being switched back-and-forth between architectures.

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Aufbruch in die nächste Dimension: nanometergroße, mehrkernige Koordinationsverbindungen mitC3-symmetrischen Liganden

Cited by 18 publications

References 30 publications

P309: Fetal echocardiography results in twins at the referral center

P309: Fetal echocardiography results in twins at the referral center

Complex Formation of NiII, CuII, PdII, and CoIII with 1,2,3,4-Tetraaminobutane

Classification of Coordination Polygons and Polyhedra According to Their Mode of Self‐Assembly

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