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Four coordination polymers, [HgL1Br2]n (1), {[Cd(L1)2Cl2]·2CH3OH}n (2), [HgL2Cl2]n (3) and [Cd(L2)2Cl2]n (4), have been synthesized and characterized from two hydrazone Schiff base ligands (L1 and L2) with mercury(II) or cadmium(II) halide, respectively. In complexes 1 and 3, each mercury(II) center is five-coordinated with distorted square pyramidal geometry in 1D coordination polymers. In complexes 2 and 4, each cadmium(II) center is six-coordinated with slightly distorted octahedral geometry in 1D looped-chain structures. Interestingly, the ligands show different coordination sites in the formation of coordination polymers. In complexes 2, 3 and 4, the ligands coordinate to the metal centers by pyridine nitrogen atoms and amino nitrogen atoms, whereas in complex 1 it coordinates by pyridine nitrogen atoms and carbonyl oxygen atoms instead of amino nitrogen atoms.

Percutaneous coronary intervention with drug-eluting stents (DES) may achieve midterm outcomes comparable to coronary artery bypass grafting (CABG) for unprotected left main coronary artery disease, but few real-world, long-term studies have been reported. In this study, 376 patients with unprotected left main coronary artery disease who underwent DES implantation (n = 131) or CABG (n = 245) were evaluated, and outcomes were compared using propensity analyses to adjust for baseline differences. Overall, 367 patients (98%) had complete clinical follow-up for a median of 4.0 years (interquartile range 3.2 to 4.7). Although the overall sample size was limited, there was a trend toward lower mortality with DES versus CABG in unadjusted (hazard ratio [HR] 0.50, 95% confidence interval [CI] 0.20 to 1.22, p = 0.13), multivariate-adjusted (HR 0.37, 95% CI 0.13 to 1.09, p = 0.07), and propensity score-adjusted (HR 0.34, 95% CI 0.12 to 1.03, p = 0.06) analyses. Treatment with DES was associated with a higher rate of target-vessel revascularization (TVR; 18% vs 9%, p = 0.02). However, ischemic TVR was not significantly different between the 2 groups (25% vs 39%, p = 0.15) in patients who received angiographic follow-up. No differences were detected in the occurrence of composite major adverse cardiac and cerebrovascular events between DES and CABG (27% vs 22%, p = 0.42). In conclusion, during 4-year follow-up, overall composite major adverse cardiac and cerebrovascular events were similar after DES and CABG treatment of unprotected left main coronary artery disease, with a trend toward lower mortality after percutaneous coronary intervention with DES. DES were associated with a higher rate of TVR compared to CABG, but ischemic TVR was not significantly different between the 2 groups.