A new class of nanostructures has been prepared and characterized. These nanocomposite hybrid materials are composed of two-dimensional MQ (II−VI) slabs and organic bifunctional molecules that act as links as well as spacers. The most intriguing properties of these nanostructures are that they exhibit strong quantum confinement effect while possessing a perfectly periodic arrangement. The crystal structures of [MnSe(en)0.5] (1; en = ethylenediamine), [MnSe(pda)0.5] (2; pda = propanediamine), [ZnSe(en)0.5] (3), and [ZnSe(pda)0.5] (4) have been analyzed by single crystal and powder X-ray diffraction methods. Compounds 1 and 3 are isostructural and crystallize in orthorhombic crystal system, space group Pbca (No. 61), Z = 4. Crystal data for 1:  a = 6.711(1), b = 6.614(1), c = 17.720(4) Å, For 3:  a = 6.6326(7), b = 6.4630(6), c = 17.3540(16) Å. Compounds 2 and 4 are isostructural and crystallize in orthorhombic crystal system, space group Cmc21 (No. 36), Z = 4. Crystal data for 2:  a = 20.384(4), b = 6.719(1), c = 6.565(1) Å. For 4:  a = 19.9731(18), b = 6.6268(7), c = 6.4394(6) Å. The optical absorption experiments show that both 3 and 4 generate a very large blue shift in the absorption edge (1.4−1.5 eV), and both compounds are thermally stable up to 250 °C.

Aims The risk of life-threatening ventricular arrhythmias (LTVA) has been reported to be lower in Takotsubo syndrome (TS) compared with ST-elevation myocardial infarction (STEMI). However, the extent to which these differences relate to the fact that most patients with TS are women (who have a lower risk of LTVA) and a relatively larger proportion of patients with STEMI are men is incompletely understood. We aimed to investigate the risk of LTVA or death in sex-matched and age-matched patients with TS, anterior STEMI, and non-anterior STEMI. Methods and results We systematically reviewed the charts of all patients with TS who were treated at Sahlgrenska University Hospital (Gothenburg, Sweden) between 2008 and 2019. A total of 155 patients with confirmed TS (according to the European Society of Cardiology diagnostic criteria for TS) were sex-matched and age-matched 1:1:1 to patients with anterior and non-anterior STEMI. Baseline characteristics and in-hospital outcomes were recorded directly from the patient charts for all patients, and all admission electrocardiographs were analysed. The primary outcome was the composite of death or LTVA [defined as sustained ventricular tachycardia (>30 s) or ventricular fibrillation] within 72 h. The risk of LTVA or death within 72 h after admission was considerably lower in TS (2.6%) vs. anterior STEMI (14%; P = 0.002) and non-anterior STEMI (9.0%; P = 0.02), despite similar or greater risks of acute heart failure, and similar risks of cardiogenic shock. Compared with STEMI, TS was associated with a lower risk of sustained and non-sustained ventricular tachycardia and ventricular fibrillation. Conclusions In a predominantly female age-matched and sex-matched cohort of patients with TS, anterior STEMI, and non-anterior STEMI, the adjusted risk of in-hospital LTVA or death was considerably lower in TS compared with STEMI, despite similar or greater risk of acute heart failure and similar risk of cardiogenic shock.

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