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Inorganic Pharmaceutical Chemistry 5

الكلية كلية العلوم للبنات     القسم قسم الكيمياء     المرحلة 3
أستاذ المادة محمد حامد سعيد الدهيمي       22/12/2012 04:12:45
Inorganic Pharmaceutical Chemistry
Lecture No. 5 Date : 22/11 /2012
Dr. Mohammed Hamed
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Coordination compounds
Coordination compounds have been recognized by chemists as a special type of compound since late in the eighteenth century . Throughout the Nineteenth century , a wide variety of "complex inorganic compounds" were prepared by reacting metal salts with neutral organic or inorganic~oolecules, such as ethylene or ammonia, or with halide Ions and other simple anions, such as cyanide and nitrite . In 1892 Alfred Werner, proposed the Coordination Theory.

Werner s Coordination Theory is one of the great landmarks of chemistry and has proved extremely fruitful in foster inga myriad of developments that have taken coordination chemistry in to such diverse areas as the use of organometallic compounds in synthesis and catalysis , new insights in to the role of metal ions in biochemical reactions , and investigations in to metal-metal bonding and the formation of clusters .where a number of metal centers come together in one compound. Today, coordination compounds play key roles in medicine, agriculture , materials science , electrochemistry , catalysis , and industrial organic synthesis. Definitions and Terminology

Werner s Coordination Theory
1. In co-ordination compounds, central metal atoms exhibit primary valence and secondary valence.

primary valence is ionizable. Secondary valence is not ionizable. The primary valence corresponds to oxidation state.The secondary valence corresponds to coordination number. (the central metal ion and ligands are not ionizable)
2. Every metal atom has a fixed number of secondary valences (coordination number(s)).
3. The metal atom tends to satisfy both its primary valence as well as its secondary valence. Primary valence is satisfied by negative ions (metal ion has a positive charge) whereas secondary valence (coordination number) is satisfied either by negative ions or by neutral molecules. (In certain case a negative ion may satisfy both types of valences).
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المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .