مروری بر پلیمرهای کوئوردینانسی مارپیچی آرایش‌یافته با برهم‌کنش‌های غیرکووالانسی

نوع مقاله: تالیفی

نویسندگان

دانشگاه تهران

چکیده

پلیمرهای کوئوردینانسی (CPs) که چارچوب‌های فلز-آلی (MOFs) نیز نامیده می‌شوند، با استفاده از لیگاندهای آلی پل‌ساز و یون‌های فلزی (یا خوشه‌های فلزی) تهیه می‌شوند. با توجه به شکل هندسی کوئوردینانسی فلز، لیگاندهای پل‌ساز و اتم‌های دهنده موجود در این لیگاندها، ساختارهای پلیمری مختلف یک‌بعدی، دوبعدی یا شبکه پلیمری سه‌بعدی ایجاد می‌شوند. در ساختار این دسته از مواد هیبریدی معدنی-آلی برهم‌کنش‌های مختلف شامل پیوندهای کوئوردینانسی، هیدروژنی، برهم‌کنش‌های π...π و CH…π وجود دارد. این ترکیبات به علت دارا بودن کاربردهای بالقوه در زمینه‌های مختلف شامل جذب و ذخیره‌سازی گاز، مغناطیس، دارورسانی، کاتالیزور ناهمگن و حسگرهای شیمیایی مورد توجه‌اند. مقالات بسیاری در باره تهیه پلیمرهای کوئوردینانسی متخلخل با ساختار مارپیچی با استفاده از فلزات واسطه و لیگاندهای پل‌ساز کایرال یا غیرکایرال وجود دارند. کوچک‌ترین جزء تکرارشونده در ساختار مارپیچی، به دلیل شباهت به سامانه‌های زیستی و کاربردهای مفید آن‌ها بسیار حائز اهمیت است. در این مقاله، مثال‌هایی از پلیمرهای کوئوردینانسی با زنجیرهای مارپیچی تک، دو و چندرشته‌ای ارائه شده و عوامل مختلف مؤثر بر ساختار آن‌ها شامل برهم‌کنش‌های غیرکووالانسی، ساختار لیگاند و یون‌های مخالف بحث می‌شود. همچنین به ارتباط میان خصلت کایرالی واحدهای ساختاری و زنجیرهای مارپیچی، ویژگی‌های پلیمرهای کوئوردینانسی مارپیچی و برخی از کاربردهای بالقوه آن‌ها نیز اشاره می‌شود. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Helical Coordination Polymers Configured by Non-covalent Interactions: A Review

نویسندگان [English]

  • Mahnaz Najafi
  • Alireza Abbasi
چکیده [English]

Coordination polymers (CPs), also known as metal-organic frameworks (MOFs), can be synthesized using organic bridging ligands and metal ions (or metal clusters). Structures with various architectures including one-, two- or three-dimensional polymeric networks can be formed depending on the bridging ligands, their donor atoms and coordination geometry of metal ions. In the structure of these inorganic-organic hybrid materials, there are different interactions such as coordination bonds, hydrogen bonds, π…π and CH…π interactions. These compounds are of industrial interests owing to their potential applications in the field of gas adsorption and storage, magnetism, drug delivery, heterogeneous catalysis and chemical sensors. Many published reports have made contributions to the preparation of porous coordination polymers with helical conformation using transition metals and chiral/achiral bridging ligands. Helical structural motifs have gained considerable importance because of their similarities in biological systems and useful applications. This paper presents an overview on selected examples of CPs with single-, double- and multi-stranded helical chains and discusses various factors that influence their constructions such as non-covalent interactions, ligand structure and counter ions. The connectivity between chirality of the building blocks and helicity of chains is also explained. Furthermore, the properties of helical CPs and some of their possible applications are explained in this article.

کلیدواژه‌ها [English]

  • porous co-ordination polymer
  • metal-organic framework
  • helical chain
  • chirality
  • non-covalent interaction
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