Syntheses, structures and magnetic properties of two CoII/NiII isostructural coordination polymers based on an asymmetric semirigid tricarboxylate ligand.

Two new isostructural complexes, namely, poly[aqua[µ3-2-(4-carboxyphenoxy)terephthalato-κ3O1:O4:O4'](1,10-phenanthroline-κ2N,N')cobalt(II)], [Co(C15H8O7)(C12H8N2)(H2O)]n or [Co(µ3-Hcpota)(phen)(H2O)]n, I, and poly[aqua[µ3-2-(4-carboxyphenoxy)terephthalato-κ3O1:O4:O4'](1,10-phenanthroline-κ2N,N')nickel(II)], [Ni(C15H8O7)(C12H8N2)(H2O)]n or [Ni(µ3-Hcpota)(phen)(H2O)]n, II, have been synthesized by solvothermal reactions. Complexes I and II were fully characterized by IR spectroscopy, elemental analyses, thermogravimetric analyses, and powder and single-crystal X-ray diffraction. They both present two-dimensional structures based on [M2(µ-COO)2]2+ (M = CoII or NiII) dinuclear metal units with a fes topology and a vertex symbol (4·82). Interestingly, the positions of the two dimeric metal motifs and the two partially deprotonated Hcpota2- ligands reproduce regular flying butterfly arrangements flipped upside down and sharing wings in the ab plane. Magnetic studies indicate antiferromagnetic interactions (J = -5.21 cm-1 for I and -11.53 cm-1 for II) in the dimeric units, with Co...Co and Ni...Ni distances of 4.397 (1) and 4.358 (1) Å, respectively, that are related to double syn-anti carboxylate bridges.

Quadratus Lumborum Block is an Effective Postoperative Analgesic Technique in Pediatric Patients Undergoing Lower Abdominal Surgery: A Meta-Analysis.

BACKGROUND: Quadratus lumborum (QL) block has shown promising analgesic efficacy in the adult population in previous meta-analyses. However, the response of the pediatric group to pain stimulation is stronger than that in the adult population, and the management of pediatric pain is constrained by limited available analgesia agents. All data analyzed during this study are collected from published articles. OBJECTIVE: The purpose of our systematic review was to evaluate whether QL block is also an effective postoperative analgesic technique, compared to other analgesic skills in pediatric patients undergoing lower abdominal surgery. STUDY DESIGN: A meta-analysis. METHODS: We identified randomized controlled trials (RCTs) from PubMed, Embase, the Cochrane Library, Web of Science, and Science Direct to compare QL block with other analgesic methods for relief of postoperative pain in pediatric patients undergoing lower abdominal surgeries under general anesthesia. The primary outcome was the rate of postoperative rescue analgesia; secondary outcomes include: pain scores at 30 minutes and 1, 2, 4, 6, 12, and 24 hours postoperatively, patient satisfaction, and block related complications. RESULTS: A total of 7 studies with 346 patients were included. QL block showed a significant reduction in the rate of postoperative rescue analgesia in the first 24 hours (RR = 0.41; 95% CI = 0.28 to 0.59; P < 0.001) compared to other analgesic techniques, without significant heterogeneity among the articles (I2 = 49%, P = 0.08). Compared with other analgesic methods, QL block significantly reduced the pain scores at 2 hours (Std.MD = -0.76; 95% CI = -1.16 to -0.35; P < 0.001) (I2 < 0.001%, P = 0.41), 4 hours (Std.MD = -0.34; 95% CI = -0.67 to -0.01; P = 0.04) (I2 < 0.001%, P = 0.53) and 12 hours postoperatively (Std.MD = -0.95; 95% CI = -1.44 to -0.47; P < 0.001) (I2 = 27%, P = 0.24). No significant differences were found between techniques at 30 minutes and 1, 6, or 24 hours postoperatively (P > 0.05). There was no statistically significant change in patient satisfaction (Std.MD = 0.49; 95% CI = -0.32 to 1.29; P = 0.24) or side effects (RD = -0.02; 95% CI = -0.06 to 0.02; P = 0.31) with QL block. LIMITATIONS: The major limitation of this meta-analysis is the relatively few RCTs and limited results included. Similarly, the differences in block approaches among the control groups (TAP, ESP, caudal block, opioid-based analgesia), drug types and concentrations, and multimodal analgesia programs led to considerable heterogeneity. Furthermore, some relevant outcomes were not investigated. CONCLUSION: Our systematic review and meta-analysis suggests QL block use for the pediatric population undergoing lower abdominal surgery, based on the current limited research evidence, as this method was an effective postoperative analgesic technique.

A novel three-dimensional tetranuclear CoII coordination polymer with water hexamers based on the V-shaped tetracarboxylate ligand 4-(2,4-dicarboxylatophenoxy)phthalate.

A new coordination polymer (CP), namely, poly[[diaquatris[µ2-1,4-bis(1H-imidazol-1-yl)benzene]bis[µ6-4-(2,4-dicarboxylatophenoxy)phthalato]tetracobalt(II)] hexahydrate], {[Co4(C16H6O9)2(C12H10N4)3(H2O)2]·6H2O}n, has been synthesized by solvothermal reaction. The CP was fully characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis, and powder and single-crystal X-ray diffraction. It presents a three-dimensional (3D) structure based on tetranuclear CoII secondary building units (SBUs) with a tfz-d net and point symbol (43)2(46·618·84). The 4-(2,4-dicarboxyphenoxy)phthalic acid (H4dcppa) ligands are completely deprotonated and link {Co4(COO)4}4- SBUs into two-dimensional (2D) layers. Furthermore, adjacent layers are connected by 1,4-bis(1H-imidazol-1-yl)benzene (bib) ligands, giving rise to a 3D supramolecular architecture. Interestingly, there are numerous elliptical cavities in the CP where isolated unique discrete hexameric water clusters have been observed. The results of thermogravimetric and magnetic analyses are described in detail.

Luminescent and magnetic bifunctional coordination complex based on a chiral tartaric acid derivative and europium.

A new mononuclear europium complex incorporating the (+)-di-p-toluoyl-D-tartaric acid (D-H2DTTA) ligand, namely, catena-poly[tris{µ2-3-carboxy-2,3-bis[(4-methylphenyl)carbonyloxy]propanoato}tris(methanol)europium(III)], [Eu(C20H17O8)3(CH3OH)3]n, (I), has been synthesized and characterized by IR spectroscopy, elemental analysis, powder X-ray diffraction and single-crystal X-ray diffraction analysis. The structure analysis indicates that complex (I) crystallizes in the trigonal space group R3 and exhibits an infinite one-dimensional chain structure, in which the Eu3+ ion is surrounded by six O atoms from six D-HDTTA- ligands and three O atoms from three coordinated methanol molecules, thus forming a tricapped trigonal prism geometry. The D-H2DTTA ligand is partially deprotonated and adopts a µ1,6-coordination mode via two carboxylate groups to link adjacent Eu3+ ions, affording an infinite one-dimensional propeller-shaped coordination polymer chain along the c axis, with an Eu...Eu distance of 7.622 (1) Å. Moreover, C-H...π interactions lead to the formation of helical chains running along the c axis and the whole structure displays a snowflake pattern in the ab plane. The circular dichroism spectrum confirms the chirality of complex (I). The solid-state photoluminescence properties were also investigated at room temperature and (I) exhibits characteristic red emission bands derived from the Eu3+ ion (CIE 0.63, 0.32), with a reasonably long lifetime of 0.394 ms, indicating effective energy transfer from the ligand to the metal centre. In addition, a magnetic investigation reveals single-ion magnetic behaviour. The spin-orbit coupling parameter (λ) between the ground and excited states is fitted to be 360 (2) cm-1 through Zeeman perturbation. Therefore, complex (I) may be regarded as a chiral optical-magneto bifunctional material.

A thermally stable three-dimensional cobalt(II) coordination polymer based on the V-shaped ligand 4-(4-carboxyphenoxy)isophthalate.

A new cobalt(II) coordination polymer (CP), poly[[bis[µ6-4-(4-carboxylatophenoxy)benzene-1,3-dicarboxylato-κ6O1:O1:O3:O3':O4:O4']bis(1,10-phenanthroline-κ2N,N')tricobalt(II)] 0.72-hydrate], {[Co3(C15H7O7)2(C12H8N2)2]·0.72H2O}n, (I), is constructed from CoII ions and 4-(4-carboxyphenoxy)isophthalate (cpoia3-) and 1,10-phenanthroline (phen) ligands. Based on centrosymmetric trinuclear [Co3(phen)2(COO)6] secondary building units (SBUs), the structure of (I) is a three-dimensional CP with a (3,6)-connected net and point symbol (42.6)2(44.62.87.102). The positions of four [Co3(phen)2(COO)6] SBUs and four cpoia3- ligands reproduce a Chinese-knot-shaped arrangement along the ab plane. (I) has been characterized by single-crystal X-ray diffraction, IR spectroscopy, powder X-ray diffraction (PXRD) and thermostability analysis. It shows a good thermal stability from room temperature to 673 K. In addition, the temperature dependence of the magnetic properties was measured.

[Study on between magnetic resonance venography and digital subtraction angiography on the inferior vena cava obstructive interface morphology of Budd-Chiari syndrome].

OBJECTIVE: To evaluate magnetic resonance venography (MRV) in diagnosing obstructive interface morphology of Budd-Chiari syndrome(BCS). METHODS: MRV examination was performed on 44 cases of BCS, and the images of obstructive interface morphology of the inferior vena cava were reviewed by two radiologists. RESULTS: In all 44 cases, there were 37 cases with complete obstruction and 7 with incomplete obstruction. MRV showed 4 cases with membrane with hole of incomplete obstruction. The morphologies MRV demonstrated that the proximal part of the 37 cases with complete obstruction were mainly divided into the cone type (36 cases) and the planum type (1 case). Besides, the type of distal end of obstruction were the cone type (30 cases), the planum type (4 cases) and the irregular type (3 cases). The overall sensitivity, specificity, positive and negative predictive values for the diagnosis of MRV were respectively 100%%, 57.1%, 92.5% and 100% as compared to the DSA. CONCLUSION: The examination of MRV is capable of revealing the obstructive interface morphology of the inferior vena cava, especially for the distal end of obstruction. MRV can provide guidelines in interventional treatment of Budd-Chiari syndrome.