From owner-chemistry@ccl.net Tue May 1 01:32:01 2007 From: "Adam Hunter spacyhunter|a|gmail.com" To: CCL Subject: CCL:G: Open-shell singlet Message-Id: <-34161-070430193202-18888-YXbJnbOmsC5hbBy4FCLfLA,,server.ccl.net> X-Original-From: Adam Hunter Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=ISO-8859-1; format=flowed Date: Mon, 30 Apr 2007 15:30:48 -0700 MIME-Version: 1.0 Sent to CCL by: Adam Hunter [spacyhunter:-:gmail.com] Hi, all, I'm new in doing computational chemistry. Now I'm frustrated in trying to get the energies of open-shell singlets. Let me study the classical O2 example. The 1^Sigma(+) state of the O2 molecule is an open-shell singlet. RHF and UHF both can not generate the correct wave function b/c the degeneracy of the HOMO and LUMO. So a multi-configuration method is needed under such a situation. I've tried the CASSCF method but still got a undetermined electronic state. So here I want to ask how one can generate the correct wave function for an open-shell singlet. By the way, I mainly use the G03 package. If you know any other package which can do this job well, I'd like to know also. Any help would be greatly appreciated! best regards Adam From owner-chemistry@ccl.net Tue May 1 04:05:00 2007 From: "Jerry Chan chanjcc.:_:.ntu.edu.tw" To: CCL Subject: CCL: Textbooks for chemical kinetics Message-Id: <-34162-070501031926-15578-E/2kdxRdWHyZwKi/UaeVRg:_:server.ccl.net> X-Original-From: Jerry Chan Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=Big5 Date: Tue, 01 May 2007 15:12:31 +0800 MIME-Version: 1.0 Sent to CCL by: Jerry Chan [chanjcc||ntu.edu.tw] Dear all, I am wondering which textbooks are the best for a graduate or senior undergraduate course on chemical kinetics. In addition to various reaction mechanisms, the textbook should provide a quantitative background for the students to understand phenomena such as gas adsorption on substrate surface, and crystal nucleation and growth process. Thanks in advance for your suggestion, Jerry -- Jerry C. C. Chan phone: 886-2-33662994 Chemistry Department fax: 886-2-23636359 National Taiwan University No. 1, Sec. 4, Roosevelt Road Taipei, Taiwan http://spin.ch.ntu.edu.tw From owner-chemistry@ccl.net Tue May 1 06:46:01 2007 From: "Wai-To Chan chan-x-curl.gkcl.yorku.ca" To: CCL Subject: CCL:G: Open-shell singlet Message-Id: <-34163-070501064148-24472-BVMnNctzzPOJs3IIgpT32A^server.ccl.net> X-Original-From: Wai-To Chan Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii Date: Tue, 1 May 2007 07:18:01 -0400 (EDT) MIME-Version: 1.0 Sent to CCL by: Wai-To Chan [chan#,#curl.gkcl.yorku.ca] Undetermined electronic state for open-shell wave functions is quite common. I don't think this problem is unique to Gaussian. It also happened to me often that GAMESS could fail to recognize the state of a UHF or CASSCF wavefunction. If the wavefunction is not too far distorted from the correct symmetry you may try to determine the electronic state from inspections of the UHF molecular orbitals or the CASSCF natural orbitals. A possible trick which I never tried is to clean up the MOs by setting infinitesimally small numbers to zero and equating nearly equal numbers in the MO coefficients. Wai-To Chan From owner-chemistry@ccl.net Tue May 1 08:30:01 2007 From: "Thomas E Sorensen tes*uwm.edu" To: CCL Subject: CCL: COLUMBUS Port to GFORTRAN Message-Id: <-34164-070501082508-23140-RC7buUgoWb+fmXydE5uJ6A%a%server.ccl.net> X-Original-From: "Thomas E Sorensen" Date: Tue, 1 May 2007 08:25:04 -0400 Sent to CCL by: "Thomas E Sorensen" [tes.#%#.uwm.edu] Has anyone ported COLUMBUS to GFORTRAN? I was hoping to get updated "install.automatic" scripts before I try the port myself. From owner-chemistry@ccl.net Tue May 1 09:11:00 2007 From: "Frank Neese neese#%#thch.uni-bonn.de" To: CCL Subject: CCL: Open Shell Singlets Message-Id: <-34165-070501084853-931-bjC6uj7NpIFy8q5EzADyIw{}server.ccl.net> X-Original-From: Frank Neese Content-Type: text/plain; charset="us-ascii"; format=flowed Date: Tue, 01 May 2007 14:48:35 +0200 Mime-Version: 1.0 Sent to CCL by: Frank Neese [neese++thch.uni-bonn.de] Dear Adam, you can do such calculations for example with the ORCA package in the ROHF or CASSCF modes. For dynamic correlation either can be followed by MRCI or MRPT. You can download the program for free at http://www.thch.uni-bonn.de/tc/orca/. For O2 a reasonable input is: ! ROHF cc-pVDZ TightSCF * xyz 0 1 O 0 0 0 O 0 0 1.2 * The program determines automatically that you look at an open-shell singlet state and chooses its options accordingly. The calculations gives you one component of the orbitally degenerate 1-Delta state. Its energy is -149.56212 Eh. You can do a CASSCF calculation which needs 2 electrons in two orbitals. You can either do it for both components of the 1-Delta state or you can average of all three singlets. A reasonable input is: ! cc-pVDZ TightSCF %casscf nel 2 norb 2 mult 1 nroots 2 end * xyz 0 1 O 0 0 0 O 0 0 1.2 * For two roots you get the same energy as in the ROHF case, for three roots you get a very slightly higher energy (-149.56210) since the orbitals are now a compromise for three singlet states. You can also average the orbitals over the lowest 3-Sigma and the 1-Delta state as follows: ! cc-pVDZ TightSCF %casscf nel 2 norb 2 mult 1,3 nroots 2,1 end * xyz 0 1 O 0 0 0 O 0 0 1.2 * Finally, introducing dynamic correlation on top of CASSCF may be done via MRACPF as follows: ! cc-pVDZ TightSCF %casscf nel 2 norb 2 mult 1,3 nroots 2,1 end %mrci citype mracpf intmode fulltrafo tsel 0 tpre 1e-4 newblock 1 * nroots 3 refs cas(2,2) end end newblock 3 * nroots 1 refs cas(2,2) end end end * xyz 0 1 O 0 0 0 O 0 0 1.2 * The ORCA MRCI program is presently of the "individually selecting" type which means that interacting configurations are selected on the basis of an estimate for their second order perturbation energy.The selection threshold "tsel" is put to zero since this is such a small calculation; the result is then "exact". It is: ------------------- TRANSITION ENERGIES ------------------- The lowest energy is -149.903731790 Eh State Mult Irrep Root Block mEh eV 1/cm 0 3 -1 0 1 0.000 0.000 0.0 1 1 -1 1 0 39.078 1.063 8576.7 2 1 -1 0 0 39.079 1.063 8576.7 3 1 -1 2 0 57.024 1.552 12515.4 which is very good. With larger basis sets you get it even better. For larger molecules you need to take tsel on the order of 1e-5 to 1e-8 and be careful with possible artifacts from the selection. Note that such calculations become expensive very quickly. Many other options are described in the manual of the orca program. Hope that helps, all the best, Frank From owner-chemistry@ccl.net Tue May 1 11:03:01 2007 From: "John McKelvey jmmckel.:.gmail.com" To: CCL Subject: CCL: DFT Alphabet Soup Dictionary Message-Id: <-34166-070501104737-17884-FEyjc+/TggjDV3qDFEtT0Q.:.server.ccl.net> X-Original-From: "John McKelvey" Content-Type: multipart/alternative; boundary="----=_Part_75793_16136969.1178030826981" Date: Tue, 1 May 2007 10:47:06 -0400 MIME-Version: 1.0 Sent to CCL by: "John McKelvey" [jmmckel!A!gmail.com] ------=_Part_75793_16136969.1178030826981 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Folks, I can't be the only one who could use this, but is there a single, or perhaps two web sites , or publications that give the functional breakdowns of the majority of the functionals currently in use? Best regards, John McKelvey ------=_Part_75793_16136969.1178030826981 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Folks,

I can't be the only one who could use this, but is there a single, or perhaps two web sites , or publications that give the functional breakdowns of the majority of the functionals currently in use?

Best regards,

John McKelvey
------=_Part_75793_16136969.1178030826981-- From owner-chemistry@ccl.net Tue May 1 13:30:01 2007 From: "Wayne Steinmetz WES04747%%pomona.edu" To: CCL Subject: CCL: DFT Alphabet Soup Dictionary Message-Id: <-34167-070501132801-25356-KdzIrYpOt9ShTJchp6vsRw#%#server.ccl.net> X-Original-From: "Wayne Steinmetz" Content-class: urn:content-classes:message Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C78C16.34D6BAB6" Date: Tue, 1 May 2007 10:27:27 -0700 MIME-Version: 1.0 Sent to CCL by: "Wayne Steinmetz" [WES04747||pomona.edu] This is a multi-part message in MIME format. ------_=_NextPart_001_01C78C16.34D6BAB6 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable You may find the following Web-based review of Perdew's Jacob's Ladder useful: http://www-ledss.ujf-grenoble.fr/PERSONNEL/LEDSS7/casida/CompChem/DFT.ht ml=20 =20 Wayne E. Steinmetz Carnegie Professor of Chemistry Woodbadge Course Director Chemistry Department Pomona College 645 North College Avenue Claremont, California 91711-6338 USA phone: 1-909-621-8447 FAX: 1-909-607-7726 Email: wsteinmetz%pomona.edu WWW: pages.pomona.edu/~wsteinmetz =20 ________________________________ > From: owner-chemistry%ccl.net [mailto:owner-chemistry%ccl.net]=20 Sent: Tuesday, May 01, 2007 7:47 AM To: Wayne Steinmetz Subject: CCL: DFT Alphabet Soup Dictionary =20 Folks, I can't be the only one who could use this, but is there a single, or perhaps two web sites , or publications that give the functional breakdowns of the majority of the functionals currently in use? Best regards, John McKelvey ------------------------------------------------------------- This message has been scanned by Postini anti-virus software. =0D ------_=_NextPart_001_01C78C16.34D6BAB6 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

You may find the following = Web-based review of Perdew’s Jacob’s Ladder = useful:

http://www-ledss.ujf-grenoble.fr/PERSONNEL/LEDSS7/casida/CompC= hem/DFT.html

 

Wayne E. = Steinmetz

Carnegie Professor of = Chemistry

Woodbadge Course = Director

Chemistry = Department

Pomona College

645 North College = Avenue

Claremont, California 91711-6338

USA

phone: = 1-909-621-8447

FAX: = 1-909-607-7726

Email: = wsteinmetz%pomona.edu

WWW: = pages.pomona.edu/~wsteinmetz

 


From: owner-chemistry%ccl.net [mailto:owner-chemistry%ccl.net]
Sent: Tuesday, May 01, = 2007 7:47 AM
To: Wayne Steinmetz
Subject: CCL: DFT = Alphabet Soup Dictionary

 

Folks,

I can't be the only one who could use this, but is there a single, or = perhaps two web sites , or publications that give the functional breakdowns of = the majority of the functionals currently in use?

Best regards,

John McKelvey

-------------------------------------------------------------
This message has been scanned by Postini anti-virus software.
=0D
------_=_NextPart_001_01C78C16.34D6BAB6--


From owner-chemistry@ccl.net Tue May  1 14:04:00 2007
From: "Atul Agarwal aagarwal###achillion.com" 
To: CCL
Subject: CCL: amine prodrugs
Message-Id: <-34168-070501104253-17407-anyacX30wX9BVcu1ODuwWA|,|server.ccl.net>
X-Original-From: "Atul  Agarwal" 
Date: Tue, 1 May 2007 10:42:50 -0400


Sent to CCL by: "Atul  Agarwal" [aagarwal-$-achillion.com]
Fellow Comp chemists,

Has anyone done any calculations on phosphate prodrugs of amines?  There are two steps involved in the release of parent, bio-conversion (hydrolysis) of the phosphate to yield (e.g.) hydroxymethoxycarbonyl linker, and subsequently, cleavage of amino acid ester through intramolecular nucleophilic catalysis.  I am looking for ways to predict the rates of these two steps.  An example of such prodrugs can be found in the following ref (Bioorg Med Chem Lett 10, 2000, 1121).

I would appreciate any clues.

thanks,
Atul

Atul Agarwal
Achillion Pharm
300 George St
New Haven, CT  06511
aagarwal++achillion.com


From owner-chemistry@ccl.net Tue May  1 14:39:01 2007
From: "Alexandr Isayev alex|a|ccmsi.us" 
To: CCL
Subject: CCL: DFT Alphabet Soup Dictionary
Message-Id: <-34169-070501141952-24813-ocJHkatGDOQhb0/7z2zEGA(0)server.ccl.net>
X-Original-From: Alexandr Isayev 
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=us-ascii
Date: Tue, 1 May 2007 12:43:27 -0500
MIME-Version: 1.0


Sent to CCL by: Alexandr Isayev [alex]_[ccmsi.us]
Hi John,

There is nice introductorily book on DFT "A Chemist's Guide to Density
Functional Theory"
http://www.amazon.com/Chemists-Guide-Density-Functional-Theory/dp/3527303723

Sincerely,
Alexandr

Tuesday, May 1, 2007, 9:47:06 AM, you wrote:

JMjgc> Folks,

JMjgc> I can't be the only one who could use this, but is there a
JMjgc> single, or perhaps two web sites , or publications that give
JMjgc> the functional breakdowns of the majority of the functionals currently in use?

JMjgc>  Best regards,

JMjgc> John McKelvey
JMjgc>   


-------------------------------------------------------
Alexandr Isayev,
Graduate Research Assistant, and System Administrator
\a/ Computational Center for Molecular Structure
and Interactions (CCMSI),
Jackson State University,
Jackson, MS USA
   Tel:  +(601) 979-1134
e-mail:  alex(at)ccmsi.us
   Web:  http://www.ccmsi.us
--------------------------------------------------------


From owner-chemistry@ccl.net Tue May  1 22:14:01 2007
From: "Senthil Natesan sen.natesan]=[yahoo.com" 
To: CCL
Subject: CCL: computing cross sectional area of a molecule
Message-Id: <-34170-070501153127-9648-cJ33iu7WORPfWEq0nbDjDQ:-:server.ccl.net>
X-Original-From: "Senthil  Natesan" 
Date: Tue, 1 May 2007 15:31:24 -0400


Sent to CCL by: "Senthil  Natesan" [sen.natesan|-|yahoo.com]

Dear Colleagues,

Can anyone suggest me a program or method to compute cross sectional area of a given molecule?..

Thanks in advance..

Senthil Natesan


From owner-chemistry@ccl.net Tue May  1 22:49:01 2007
From: "Andrej Grubisic agrubisic-,-jhu.edu" 
To: CCL
Subject: CCL: Textbooks for chemical kinetics
Message-Id: <-34171-070501120508-16727-kdWw+u8xlPskR7i+9T8E0g^^server.ccl.net>
X-Original-From: "Andrej Grubisic" 
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
	charset="us-ascii"
Date: Tue, 1 May 2007 11:01:37 -0400
MIME-Version: 1.0


Sent to CCL by: "Andrej Grubisic" [agrubisic * jhu.edu]
Dear Jerry,

I've used the following textbook and found it very useful for kinetics
problems:
Chemical Kinetics and Reaction Dynamics by Paul L. Houston 
     ISBN:  0072435372  (McGraw-Hill Science/Engineering/Math, 2001-03-22)
It is a great book for introducing kinetics through phenomenological
standpoint as well as for advanced level from underlying quantum theory. I
don't remember coming across crystal nucleation and growth processes in it,
though.

Hope it helps
Andrej


-----Original Message-----
> From: owner-chemistry===ccl.net [mailto:owner-chemistry===ccl.net] 
Sent: Tuesday, May 01, 2007 3:13 AM
To: Grubisic, Andrej 
Subject: CCL: Textbooks for chemical kinetics


Sent to CCL by: Jerry Chan [chanjcc||ntu.edu.tw]
Dear all,

I am wondering which textbooks are the best for a graduate or senior
undergraduate course on chemical kinetics. In addition to various
reaction mechanisms, the textbook should provide a quantitative
background for the students to understand phenomena such as gas
adsorption on substrate surface, and crystal nucleation and growth process.

Thanks in advance for your suggestion,
Jerry

-- 
Jerry C. C. Chan		phone: 886-2-33662994
Chemistry Department		fax:   886-2-23636359
National Taiwan University
No. 1, Sec. 4, Roosevelt Road
Taipei, Taiwan

http://spin.ch.ntu.edu.twhttp://www.ccl.net/cgi-bin/ccl/send_ccl_messagehttp://www.ccl.net/chemistry/sub_unsub.shtmlhttp://www.ccl.net/spammers.txt