BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Sabre//Sabre VObject 4.5.8//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Europe/Zurich X-LIC-LOCATION:Europe/Zurich TZURL:http://tzurl.org/zoneinfo/Europe/Zurich BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:19810329T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:19961027T030000 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:news340@chemie.unibas.ch DTSTAMP;TZID=Europe/Zurich:20220404T124913 DTSTART;TZID=Europe/Zurich:20220509T164500 SUMMARY: All the ways to have a bond (Dreyfus Lecture) DESCRIPTION:The concept of a chemical bond\, so essential to chemistry\, an d with a venerable history\, has life\, generating controversy and incredi ble interest. Even if (or maybe because) we can’t reduce it to physics. I will discuss some of the common experimental criteria for judging the pr esence and strength of a bond: length\, energy\, force constants\, magneti sm\, energy splittings and other spectroscopic criteria. On the theoretica l side\, I will look at bond orders\, population analyses\, bond critical points\, and electron localization functions. And I will give a personal o pinion on the utility of the various measures. My advice at the end is lik ely to be: Push the concept to its limits. Think about any bond in terms o f all the various criteria\, experimental and theoretical\, that we have d iscussed. Accept that (at the limits) a bond will be a bond by some criter ia\, maybe not others. Instead of wringing your hands about how terrible i t is that this concept cannot be unambiguously defined\, have fun with the fuzzy richness of the idea. Try to understand what motivates other people to say there is a bond there or isn’t. Always think about what change ( chemical perturbation) you can do to probe your ideas.\\r\\nCamille & Henr y Dreyfus Lectureship In memory of the Dreyfus brothers\, the Camille and Henry Dreyfus Foundation Inc. has established the Camille & Henry Dreyfus Lectureship at the University of Basel [https://chemie.unibas.ch/de/aktuel les/veranstaltungen/dreyfus-lectureship/]. The annual Lectureship brings a leading chemist from the United States to the Basel campus to deliver a s eries of talks\, and to meet with faculty and students in order to enhance the relationship between Swiss and U.S. science. X-ALT-DESC:

The concept of a chemical bond\, so essential to chemistry\, and with a venerable history\, has life\, generating controversy and incre dible interest. Even if (or maybe because) we can’t reduce it to physics . I will discuss some of the common experimental criteria for judging the presence and strength of a bond: length\, energy\, force constants\, magne tism\, energy splittings and other spectroscopic criteria. On the theoreti cal side\, I will look at bond orders\, population analyses\, bond critica l points\, and electron localization functions. And I will give a personal opinion on the utility of the various measures. My advice at the end is l ikely to be: Push the concept to its limits. Think about any bond in terms of all the various criteria\, experimental and theoretical\, that we have discussed. Accept that (at the limits) a bond will be a bond by some crit eria\, maybe not others. Instead of wringing your hands about how terrible it is that this concept cannot be unambiguously defined\, have fun with t he fuzzy richness of the idea. Try to understand what motivates other peop le to say there is a bond there or isn’t. Always think about what change (chemical perturbation) you can do to probe your ideas.

\n

C amille &\; Henry Dreyfus Lectureship
In memory of the Dr eyfus brothers\, the Camille and Henry Dreyfus Foundation Inc. has establi shed the Camille &\; Henry Dreyfus Lectureship at the Univer sity of Basel. The annual Lectureship brings a leading chemist from th e United States to the Basel campus to deliver a series of talks\, and to meet with faculty and students in order to enhance the relationship betwee n Swiss and U.S. science.

DTEND;TZID=Europe/Zurich:20220509T184500 END:VEVENT END:VCALENDAR